diff --git a/LICENSE b/LICENSE
index fc10d93fd..faa6cd3bc 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,5 +1,6 @@
 BSD 3-Clause License
 
+Copyright (c) The Lit Project.
 Copyright (c) 2020 Google LLC. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/packages/lit-dev-cloudbuild-cleanup/src/cleanup.ts b/packages/lit-dev-cloudbuild-cleanup/src/cleanup.ts
index c4bcbe5cc..1be4a5660 100644
--- a/packages/lit-dev-cloudbuild-cleanup/src/cleanup.ts
+++ b/packages/lit-dev-cloudbuild-cleanup/src/cleanup.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/.eleventy.js b/packages/lit-dev-content/.eleventy.js
index 3e575cec1..69242ca4a 100644
--- a/packages/lit-dev-content/.eleventy.js
+++ b/packages/lit-dev-content/.eleventy.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/rollup.config.js b/packages/lit-dev-content/rollup.config.js
index 58e0cd6f5..a5a1f3094 100644
--- a/packages/lit-dev-content/rollup.config.js
+++ b/packages/lit-dev-content/rollup.config.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/index.ts b/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/index.ts
index 6e9551010..f36445c6c 100644
--- a/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/index.ts
+++ b/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/index.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/locale-picker.ts b/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/locale-picker.ts
index 59efb6d5a..42c718ec7 100644
--- a/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/locale-picker.ts
+++ b/packages/lit-dev-content/samples/v2-docs/libraries/localization/runtime/locale-picker.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/index.ts b/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/index.ts
index 6e9551010..f36445c6c 100644
--- a/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/index.ts
+++ b/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/index.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/locale-picker.ts b/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/locale-picker.ts
index 59efb6d5a..42c718ec7 100644
--- a/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/locale-picker.ts
+++ b/packages/lit-dev-content/samples/v3-docs/libraries/localization/runtime/locale-picker.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_data/api-docs-pages.js b/packages/lit-dev-content/site/_data/api-docs-pages.js
index 888ec3e69..272ccd8d5 100644
--- a/packages/lit-dev-content/site/_data/api-docs-pages.js
+++ b/packages/lit-dev-content/site/_data/api-docs-pages.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_data/env.js b/packages/lit-dev-content/site/_data/env.js
index 42b4b88b0..c241f377c 100644
--- a/packages/lit-dev-content/site/_data/env.js
+++ b/packages/lit-dev-content/site/_data/env.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_data/playground_examples.js b/packages/lit-dev-content/site/_data/playground_examples.js
index 9dadfd9eb..d0171c65b 100644
--- a/packages/lit-dev-content/site/_data/playground_examples.js
+++ b/packages/lit-dev-content/site/_data/playground_examples.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_data/tutorials.js b/packages/lit-dev-content/site/_data/tutorials.js
index 68147ccf6..cf41b4260 100644
--- a/packages/lit-dev-content/site/_data/tutorials.js
+++ b/packages/lit-dev-content/site/_data/tutorials.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_data/videos.js b/packages/lit-dev-content/site/_data/videos.js
index 91cae0637..4e39b0774 100644
--- a/packages/lit-dev-content/site/_data/videos.js
+++ b/packages/lit-dev-content/site/_data/videos.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/site/_includes/footer.html b/packages/lit-dev-content/site/_includes/footer.html
index 00e67147e..6ffd1fb47 100644
--- a/packages/lit-dev-content/site/_includes/footer.html
+++ b/packages/lit-dev-content/site/_includes/footer.html
@@ -1,17 +1,29 @@
 <footer>
   <div id="footerTop">
-    <div id="footerNameAndLogo">
+    <a
+      href="https://openjsf.org/"
+      target="_blank"
+      rel="noopener"
+      title="OpenJS Foundation"
+    >
       <lazy-svg
-          loading="visible"
-          id="footerName"
-          href="{{ site.baseurl }}/images/logo.svg#name-symbol"
-          label="Lit">
+        loading="visible"
+        id="footerOpenJSLogo"
+        href="{{
+          site.baseurl
+        }}/images/openjs_foundation-logo-horizontal-color.svg"
+        label="OpenJS logo"
+      >
       </lazy-svg>
+    </a>
+
+    <div id="footerLitLogoWrapper">
       <lazy-svg
-          loading="visible"
-          id="footerFlame"
-          href="{{ site.baseurl }}/images/logo.svg#flame-symbol"
-          label="Lit logo">
+        loading="visible"
+        id="footerLitLogo"
+        href="{{ site.baseurl }}/images/logo.svg"
+        label="Lit"
+      >
       </lazy-svg>
     </div>
 
@@ -29,7 +41,8 @@
         <lazy-svg
           href="{{ site.baseurl }}/images/social/discord.svg#discord"
           label="Discord"
-          loading="visible">
+          loading="visible"
+        >
         </lazy-svg>
       </a>
 
@@ -43,7 +56,8 @@
         <lazy-svg
           href="{{ site.baseurl }}/images/social/bluesky.svg#bluesky"
           label="Bluesky"
-          loading="visible">
+          loading="visible"
+        >
         </lazy-svg>
       </a>
 
@@ -57,7 +71,8 @@
         <lazy-svg
           href="{{ site.baseurl }}/images/social/x.svg#x"
           label="X"
-          loading="visible">
+          loading="visible"
+        >
         </lazy-svg>
       </a>
 
@@ -67,12 +82,13 @@
         rel="noopener"
         title="GitHub"
         aria-label="GitHub"
+      >
+        <lazy-svg
+          href="{{ site.baseurl }}/images/social/github.svg#github"
+          label="GitHub"
+          loading="visible"
         >
-          <lazy-svg
-              href="{{ site.baseurl }}/images/social/github.svg#github"
-              label="GitHub"
-              loading="visible">
-          </lazy-svg>
+        </lazy-svg>
       </a>
 
       <a
@@ -81,13 +97,13 @@
         rel="noopener"
         title="YouTube"
         aria-label="YouTube"
+      >
+        <lazy-svg
+          href="{{ site.baseurl }}/images/social/youtube.svg#youtube"
+          label="YouTube"
+          loading="visible"
         >
-          <lazy-svg
-            href="{{ site.baseurl }}/images/social/youtube.svg#youtube"
-            label="YouTube"
-            loading="visible">
-          </lazy-svg>
-        </svg>
+        </lazy-svg>
       </a>
 
       <a
@@ -96,12 +112,15 @@
         rel="noopener"
         title="Stack Overflow"
         aria-label="Stack Overflow"
+      >
+        <lazy-svg
+          href="{{
+            site.baseurl
+          }}/images/social/stackoverflow.svg#stackoverflow"
+          label="Stack Overflow"
+          loading="visible"
         >
-          <lazy-svg
-            href="{{ site.baseurl }}/images/social/stackoverflow.svg#stackoverflow"
-            label="Stack Overflow"
-            loading="visible">
-          </lazy-svg>
+        </lazy-svg>
       </a>
 
       <a
@@ -110,19 +129,20 @@
         rel="noopener"
         title="Community Calendar"
         aria-label="Community Calendar"
+      >
+        <lazy-svg
+          href="{{ site.baseurl }}/images/icons/calendar-month.svg#icon"
+          label="Community Calendar"
+          loading="visible"
         >
-          <lazy-svg
-            href="{{ site.baseurl }}/images/icons/calendar-month.svg#icon"
-            label="Community Calendar"
-            loading="visible">
-          </lazy-svg>
+        </lazy-svg>
       </a>
     </div>
   </div>
 
   <div id="footerBottom">
     <p>
-      Copyright Google LLC. Code licensed under
+      Copyright (c) The Lit Project. Code licensed under
       <a href="https://spdx.org/licenses/BSD-3-Clause.html">BSD-3-Clause</a>.
       Documentation licensed under
       <a href="https://spdx.org/licenses/CC-BY-3.0">CC-BY-3.0</a>.
diff --git a/packages/lit-dev-content/site/css/footer.css b/packages/lit-dev-content/site/css/footer.css
index e013b83a6..4fb6faa02 100644
--- a/packages/lit-dev-content/site/css/footer.css
+++ b/packages/lit-dev-content/site/css/footer.css
@@ -10,29 +10,24 @@
   margin: var(--header-footer-margin, unset);
 }
 
-#footerNameAndLogo lazy-svg {
-  display: flex;
+#footerTop > * {
+  flex: 0;
 }
 
-#footerNameAndLogo {
-  flex: 1;
-  display: flex;
-  justify-content: space-between;
-  align-items: flex-end;
+#footerLitLogoWrapper {
+  /* Push the logo up a bit to visually align with the other logos */
+  padding-bottom: 1em;
 }
 
-#footerFlame {
-  height: 3.5em;
-  width: 2.8em;
+#footerLitLogo {
+  height: 4em;
 }
 
-#footerName {
-  height: 2.14em;
-  width: 3.24em;
+#footerOpenJSLogo {
+  height: 2.5em;
 }
 
 #footerSocialLinks {
-  flex: 1;
   display: flex;
   justify-content: flex-end;
 }
diff --git a/packages/lit-dev-content/site/images/openjs_foundation-logo-horizontal-color.svg b/packages/lit-dev-content/site/images/openjs_foundation-logo-horizontal-color.svg
new file mode 100644
index 000000000..fa063e7c5
--- /dev/null
+++ b/packages/lit-dev-content/site/images/openjs_foundation-logo-horizontal-color.svg
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 23.0.2, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="ARTWORK" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 1000 314.4" style="enable-background:new 0 0 1000 314.4;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:url(#SVGID_1_);}
+	.st1{fill:#54565A;}
+</style>
+<g>
+	<linearGradient id="SVGID_1_" gradientUnits="userSpaceOnUse" x1="28.7654" y1="49.8307" x2="243.506" y2="264.5713">
+		<stop  offset="0.2145" style="stop-color:#0075C9"/>
+		<stop  offset="0.7067" style="stop-color:#80BC00"/>
+		<stop  offset="1" style="stop-color:#FDE021"/>
+	</linearGradient>
+	<path class="st0" d="M271.4,78.1L137,0.5L136.1,0l-0.9,0.5L1.6,77.7l-0.7,0.4L0,78.6v157.2l0.9,0.5l134.4,77.6l0.9,0.5l0.9-0.5
+		l132.6-76.5l1.8-1l0.9-0.5V78.6L271.4,78.1z M122.7,20.1L89.8,77H24.1L122.7,20.1z M84.4,86.4L69,113.1L22.8,86.4H84.4z
+		 M72.4,125.8l54.3,31.4l-54.3,31.4l-18.1-31.4L72.4,125.8z M64.4,121.2l-15.4,26.7L18.1,94.5L64.4,121.2z M10.7,100.3l32.9,56.9
+		l-32.9,56.9V100.3z M48.9,166.6l15.4,26.7l-46.2,26.7L48.9,166.6z M69,201.3L84.4,228H22.8L69,201.3z M24.1,237.4h65.7l32.9,56.9
+		L24.1,237.4z M131.5,290.8l-30.8-53.4h30.8V290.8z M131.5,228H95.2l-18.1-31.4l54.3-31.4V228z M131.5,149.1l-54.3-31.4l18.1-31.4
+		h36.2V149.1z M131.5,77h-30.8l30.8-53.4V77z M207.9,121.2l46.2-26.7l-30.8,53.4L207.9,121.2z M217.9,157.2l-18.1,31.4l-54.3-31.4
+		l54.3-31.4L217.9,157.2z M203.2,113.1l-15.4-26.7h61.6L203.2,113.1z M248.1,77h-65.7l-32.8-56.9L248.1,77z M140.8,23.6L171.6,77
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+		l-30.8,53.4V237.4z M149.6,294.3l32.8-56.9h65.7L149.6,294.3z M187.8,228l15.4-26.7l46.2,26.7H187.8z M207.9,193.2l15.4-26.7
+		l30.8,53.4L207.9,193.2z M261.6,214.1l-32.9-56.9l32.9-56.9V214.1z"/>
+	<polygon class="st1" points="308.4,202.7 372.6,202.7 372.6,208.5 315,208.5 315,257 367.2,257 367.2,263 315,263 315,312.9 
+		308.4,312.9 	"/>
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+	<path class="st1" d="M782.5,295.4v-43.3h-10.4v-5.4h10.4v-23.2h6.3v23.2h19.1v5.4h-19.1v43.1c0,9.7,3.4,13.3,8.9,13.3
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+	<path class="st1" d="M857.1,279.7c0-19,15.2-34.4,34.5-34.4c19.3,0,34.2,15.4,34.2,34.4c0,19-14.9,34.5-34.2,34.5
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+		C908.2,308.6,919.4,296.1,919.4,279.7"/>
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+		c0,29.6,20.6,51.9,49.6,51.9C409,124.9,429.4,102.7,429.4,73.1"/>
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+		c-13.3,0-22.5,7.3-24.9,20.2H656.1z"/>
+	<path class="st1" d="M699.7,56.8h20.6l-0.4,15.9c5.3-11.2,16.1-17.8,29-17.8c19,0,32.1,13.5,32.1,36.7v50.8h-20.6V93.3
+		c0-12.3-5.7-19.4-17.8-19.4c-13.5,0-22.3,8.2-22.3,22v46.5h-20.6V56.8z"/>
+	<path class="st1" d="M803.5,120.9l17.6-10.8c4.9,8.8,10.6,14.9,20.8,14.9c11.6,0,19.2-5.5,19.2-21.6V3.7h21.6v100
+		c0,27.6-16.5,40.6-39.8,40.6C822.3,144.3,810.1,133.7,803.5,120.9"/>
+	<path class="st1" d="M904.9,115.6l17.8-9.8c6.5,10.8,14.9,19.4,31.8,19.4c14.1,0,24.1-7.6,24.1-19c0-12-8.2-17.4-23.3-24.1
+		l-9.2-4.1c-20.2-9-32.5-19.2-32.5-40.6c0-20.6,15.9-35.3,39-35.3C971,2,983.5,9,991.8,23.9l-16.9,10.4
+		c-5.3-9.2-11.4-13.5-22.3-13.5c-11,0-18,6.7-18,16.1c0,10.4,5.9,15.1,20,21.2l9,4.1c23.7,10.4,36.3,21.4,36.3,43.7
+		c0,24.3-19,38.4-45.1,38.4C928.5,144.3,912.6,131.3,904.9,115.6"/>
+</g>
+</svg>
diff --git a/packages/lit-dev-content/site/learn/learn.11tydata.js b/packages/lit-dev-content/site/learn/learn.11tydata.js
index 6e3104857..e822660e1 100644
--- a/packages/lit-dev-content/site/learn/learn.11tydata.js
+++ b/packages/lit-dev-content/site/learn/learn.11tydata.js
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/code-language-preference.ts b/packages/lit-dev-content/src/code-language-preference.ts
index a5766be21..b58e0a711 100644
--- a/packages/lit-dev-content/src/code-language-preference.ts
+++ b/packages/lit-dev-content/src/code-language-preference.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/algolia-search-controller.ts b/packages/lit-dev-content/src/components/algolia-search-controller.ts
index 05540901a..e18de314a 100644
--- a/packages/lit-dev-content/src/components/algolia-search-controller.ts
+++ b/packages/lit-dev-content/src/components/algolia-search-controller.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/copy-button.ts b/packages/lit-dev-content/src/components/copy-button.ts
index 014969c97..31794a3de 100644
--- a/packages/lit-dev-content/src/components/copy-button.ts
+++ b/packages/lit-dev-content/src/components/copy-button.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/lazy-svg.ts b/packages/lit-dev-content/src/components/lazy-svg.ts
index 3d33d7471..2ffbfeb9c 100644
--- a/packages/lit-dev-content/src/components/lazy-svg.ts
+++ b/packages/lit-dev-content/src/components/lazy-svg.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-aside.ts b/packages/lit-dev-content/src/components/litdev-aside.ts
index d717193ba..9d1450408 100644
--- a/packages/lit-dev-content/src/components/litdev-aside.ts
+++ b/packages/lit-dev-content/src/components/litdev-aside.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-banner.ts b/packages/lit-dev-content/src/components/litdev-banner.ts
index 918eaed74..3536cfd7c 100644
--- a/packages/lit-dev-content/src/components/litdev-banner.ts
+++ b/packages/lit-dev-content/src/components/litdev-banner.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-code-language-switch.ts b/packages/lit-dev-content/src/components/litdev-code-language-switch.ts
index aa9803474..8b1a1f499 100644
--- a/packages/lit-dev-content/src/components/litdev-code-language-switch.ts
+++ b/packages/lit-dev-content/src/components/litdev-code-language-switch.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-cookie-banner.ts b/packages/lit-dev-content/src/components/litdev-cookie-banner.ts
index 8bd0fc115..074ba0177 100644
--- a/packages/lit-dev-content/src/components/litdev-cookie-banner.ts
+++ b/packages/lit-dev-content/src/components/litdev-cookie-banner.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-design-section.ts b/packages/lit-dev-content/src/components/litdev-design-section.ts
index 4065e94c1..43c3ceb4c 100644
--- a/packages/lit-dev-content/src/components/litdev-design-section.ts
+++ b/packages/lit-dev-content/src/components/litdev-design-section.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-error-notifier.ts b/packages/lit-dev-content/src/components/litdev-error-notifier.ts
index 6e8ec5d19..ed9277702 100644
--- a/packages/lit-dev-content/src/components/litdev-error-notifier.ts
+++ b/packages/lit-dev-content/src/components/litdev-error-notifier.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-example-controls.ts b/packages/lit-dev-content/src/components/litdev-example-controls.ts
index 727c18a99..88b858289 100644
--- a/packages/lit-dev-content/src/components/litdev-example-controls.ts
+++ b/packages/lit-dev-content/src/components/litdev-example-controls.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-example.ts b/packages/lit-dev-content/src/components/litdev-example.ts
index b578ebfd9..419d93d8f 100644
--- a/packages/lit-dev-content/src/components/litdev-example.ts
+++ b/packages/lit-dev-content/src/components/litdev-example.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-flyout.ts b/packages/lit-dev-content/src/components/litdev-flyout.ts
index a7a15cd70..81eaed46a 100644
--- a/packages/lit-dev-content/src/components/litdev-flyout.ts
+++ b/packages/lit-dev-content/src/components/litdev-flyout.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-icon-button.ts b/packages/lit-dev-content/src/components/litdev-icon-button.ts
index b6662edd3..37eccd19f 100644
--- a/packages/lit-dev-content/src/components/litdev-icon-button.ts
+++ b/packages/lit-dev-content/src/components/litdev-icon-button.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-change-guard.ts b/packages/lit-dev-content/src/components/litdev-playground-change-guard.ts
index 7373b0a43..665a3f845 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-change-guard.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-change-guard.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-download-button.ts b/packages/lit-dev-content/src/components/litdev-playground-download-button.ts
index dc733acbb..d62d03a47 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-download-button.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-download-button.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-page.ts b/packages/lit-dev-content/src/components/litdev-playground-page.ts
index d58be636b..7a69288d7 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-page.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-page.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-share-button.ts b/packages/lit-dev-content/src/components/litdev-playground-share-button.ts
index 63e7a0843..27e0e541e 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-share-button.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-share-button.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-share-gist.ts b/packages/lit-dev-content/src/components/litdev-playground-share-gist.ts
index 1d5794524..147474715 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-share-gist.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-share-gist.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-playground-share-long-url.ts b/packages/lit-dev-content/src/components/litdev-playground-share-long-url.ts
index ee09571a7..5f73ec71d 100644
--- a/packages/lit-dev-content/src/components/litdev-playground-share-long-url.ts
+++ b/packages/lit-dev-content/src/components/litdev-playground-share-long-url.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-ripple-icon-button.ts b/packages/lit-dev-content/src/components/litdev-ripple-icon-button.ts
index 5fa7b0a27..197b64523 100644
--- a/packages/lit-dev-content/src/components/litdev-ripple-icon-button.ts
+++ b/packages/lit-dev-content/src/components/litdev-ripple-icon-button.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-search-modal.ts b/packages/lit-dev-content/src/components/litdev-search-modal.ts
index 24e7b506a..ebefc7f3b 100644
--- a/packages/lit-dev-content/src/components/litdev-search-modal.ts
+++ b/packages/lit-dev-content/src/components/litdev-search-modal.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-search-option.ts b/packages/lit-dev-content/src/components/litdev-search-option.ts
index 6cabbfe09..bb64e5232 100644
--- a/packages/lit-dev-content/src/components/litdev-search-option.ts
+++ b/packages/lit-dev-content/src/components/litdev-search-option.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-search.ts b/packages/lit-dev-content/src/components/litdev-search.ts
index 27525c22c..531475ad1 100644
--- a/packages/lit-dev-content/src/components/litdev-search.ts
+++ b/packages/lit-dev-content/src/components/litdev-search.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-switchable-sample.ts b/packages/lit-dev-content/src/components/litdev-switchable-sample.ts
index 8f3dc222c..67136abba 100644
--- a/packages/lit-dev-content/src/components/litdev-switchable-sample.ts
+++ b/packages/lit-dev-content/src/components/litdev-switchable-sample.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-tutorial.ts b/packages/lit-dev-content/src/components/litdev-tutorial.ts
index e71c1b8d5..81ac65a99 100644
--- a/packages/lit-dev-content/src/components/litdev-tutorial.ts
+++ b/packages/lit-dev-content/src/components/litdev-tutorial.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/litdev-version-selector.ts b/packages/lit-dev-content/src/components/litdev-version-selector.ts
index dff9bbe2a..3a9dcba37 100644
--- a/packages/lit-dev-content/src/components/litdev-version-selector.ts
+++ b/packages/lit-dev-content/src/components/litdev-version-selector.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/playground-elements.ts b/packages/lit-dev-content/src/components/playground-elements.ts
index 1f7652abf..e9f74a6e4 100644
--- a/packages/lit-dev-content/src/components/playground-elements.ts
+++ b/packages/lit-dev-content/src/components/playground-elements.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/resize-bar.ts b/packages/lit-dev-content/src/components/resize-bar.ts
index 2307054ad..4e86aa2d9 100644
--- a/packages/lit-dev-content/src/components/resize-bar.ts
+++ b/packages/lit-dev-content/src/components/resize-bar.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/ssr.ts b/packages/lit-dev-content/src/components/ssr.ts
index 17e5b33b6..4d95d36a0 100644
--- a/packages/lit-dev-content/src/components/ssr.ts
+++ b/packages/lit-dev-content/src/components/ssr.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/components/theme-switcher.ts b/packages/lit-dev-content/src/components/theme-switcher.ts
index ffc88fdf9..36d5575fb 100644
--- a/packages/lit-dev-content/src/components/theme-switcher.ts
+++ b/packages/lit-dev-content/src/components/theme-switcher.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/errors.ts b/packages/lit-dev-content/src/errors.ts
index 1577de6b3..fc164c36c 100644
--- a/packages/lit-dev-content/src/errors.ts
+++ b/packages/lit-dev-content/src/errors.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-gists.ts b/packages/lit-dev-content/src/github/github-gists.ts
index 3d64fc4b9..04c4b4a1f 100644
--- a/packages/lit-dev-content/src/github/github-gists.ts
+++ b/packages/lit-dev-content/src/github/github-gists.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-signin-receiver-page.ts b/packages/lit-dev-content/src/github/github-signin-receiver-page.ts
index 7f1108cde..cab995a01 100644
--- a/packages/lit-dev-content/src/github/github-signin-receiver-page.ts
+++ b/packages/lit-dev-content/src/github/github-signin-receiver-page.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-signin.ts b/packages/lit-dev-content/src/github/github-signin.ts
index 396c58a17..c5ef9dead 100644
--- a/packages/lit-dev-content/src/github/github-signin.ts
+++ b/packages/lit-dev-content/src/github/github-signin.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-types.d.ts b/packages/lit-dev-content/src/github/github-types.d.ts
index 16c76ceaa..1ef3d3da7 100644
--- a/packages/lit-dev-content/src/github/github-types.d.ts
+++ b/packages/lit-dev-content/src/github/github-types.d.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-user.ts b/packages/lit-dev-content/src/github/github-user.ts
index 565991ed1..86330de56 100644
--- a/packages/lit-dev-content/src/github/github-user.ts
+++ b/packages/lit-dev-content/src/github/github-user.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/github/github-util.ts b/packages/lit-dev-content/src/github/github-util.ts
index 65505e01d..86328430f 100644
--- a/packages/lit-dev-content/src/github/github-util.ts
+++ b/packages/lit-dev-content/src/github/github-util.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/apply-mods.ts b/packages/lit-dev-content/src/global/apply-mods.ts
index 5301660ea..993035869 100644
--- a/packages/lit-dev-content/src/global/apply-mods.ts
+++ b/packages/lit-dev-content/src/global/apply-mods.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/apply-saved-theme.ts b/packages/lit-dev-content/src/global/apply-saved-theme.ts
index 3c74ff02f..22929fd83 100644
--- a/packages/lit-dev-content/src/global/apply-saved-theme.ts
+++ b/packages/lit-dev-content/src/global/apply-saved-theme.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
diff --git a/packages/lit-dev-content/src/global/hydrate-common-components.ts b/packages/lit-dev-content/src/global/hydrate-common-components.ts
index 7ef8cffa5..aa2ebd617 100644
--- a/packages/lit-dev-content/src/global/hydrate-common-components.ts
+++ b/packages/lit-dev-content/src/global/hydrate-common-components.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/initialize-typescript-mode.ts b/packages/lit-dev-content/src/global/initialize-typescript-mode.ts
index 06872cb32..6810da1a3 100644
--- a/packages/lit-dev-content/src/global/initialize-typescript-mode.ts
+++ b/packages/lit-dev-content/src/global/initialize-typescript-mode.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/lit-hydrate-support.ts b/packages/lit-dev-content/src/global/lit-hydrate-support.ts
index 10b02ba95..7d96a049c 100644
--- a/packages/lit-dev-content/src/global/lit-hydrate-support.ts
+++ b/packages/lit-dev-content/src/global/lit-hydrate-support.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/mobile-drawer.ts b/packages/lit-dev-content/src/global/mobile-drawer.ts
index c55be4ee6..21595d9b1 100644
--- a/packages/lit-dev-content/src/global/mobile-drawer.ts
+++ b/packages/lit-dev-content/src/global/mobile-drawer.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/global/theme.ts b/packages/lit-dev-content/src/global/theme.ts
index 8fb19245e..d3392505a 100644
--- a/packages/lit-dev-content/src/global/theme.ts
+++ b/packages/lit-dev-content/src/global/theme.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
diff --git a/packages/lit-dev-content/src/icons/auto-mode-icon.ts b/packages/lit-dev-content/src/icons/auto-mode-icon.ts
index ea68f38ac..2bbfbb5df 100644
--- a/packages/lit-dev-content/src/icons/auto-mode-icon.ts
+++ b/packages/lit-dev-content/src/icons/auto-mode-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/back-arrow-icon.ts b/packages/lit-dev-content/src/icons/back-arrow-icon.ts
index 66685c124..7973e05c5 100644
--- a/packages/lit-dev-content/src/icons/back-arrow-icon.ts
+++ b/packages/lit-dev-content/src/icons/back-arrow-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/blue-info-icon.ts b/packages/lit-dev-content/src/icons/blue-info-icon.ts
index 0b966d14b..6388253ac 100644
--- a/packages/lit-dev-content/src/icons/blue-info-icon.ts
+++ b/packages/lit-dev-content/src/icons/blue-info-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/catalog-icon.ts b/packages/lit-dev-content/src/icons/catalog-icon.ts
index 099aa66ed..6ecdd03a2 100644
--- a/packages/lit-dev-content/src/icons/catalog-icon.ts
+++ b/packages/lit-dev-content/src/icons/catalog-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/check-circle-crossed-icon.ts b/packages/lit-dev-content/src/icons/check-circle-crossed-icon.ts
index 4bcbeeacf..b1e8b6465 100644
--- a/packages/lit-dev-content/src/icons/check-circle-crossed-icon.ts
+++ b/packages/lit-dev-content/src/icons/check-circle-crossed-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/check-circle-icon.ts b/packages/lit-dev-content/src/icons/check-circle-icon.ts
index 07ee76024..3305d1bfe 100644
--- a/packages/lit-dev-content/src/icons/check-circle-icon.ts
+++ b/packages/lit-dev-content/src/icons/check-circle-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/check-icon.ts b/packages/lit-dev-content/src/icons/check-icon.ts
index 4b68dd894..6c5054bf2 100644
--- a/packages/lit-dev-content/src/icons/check-icon.ts
+++ b/packages/lit-dev-content/src/icons/check-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/copy-icon.ts b/packages/lit-dev-content/src/icons/copy-icon.ts
index 1d99255a0..35aafd74e 100644
--- a/packages/lit-dev-content/src/icons/copy-icon.ts
+++ b/packages/lit-dev-content/src/icons/copy-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/dark-mode-icon.ts b/packages/lit-dev-content/src/icons/dark-mode-icon.ts
index e51e7cff3..ef595714f 100644
--- a/packages/lit-dev-content/src/icons/dark-mode-icon.ts
+++ b/packages/lit-dev-content/src/icons/dark-mode-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/diamond-icon.ts b/packages/lit-dev-content/src/icons/diamond-icon.ts
index a00616ded..357f4c231 100644
--- a/packages/lit-dev-content/src/icons/diamond-icon.ts
+++ b/packages/lit-dev-content/src/icons/diamond-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/download-icon.ts b/packages/lit-dev-content/src/icons/download-icon.ts
index 4a948e31e..3d75f65c1 100644
--- a/packages/lit-dev-content/src/icons/download-icon.ts
+++ b/packages/lit-dev-content/src/icons/download-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/flaky-icon.ts b/packages/lit-dev-content/src/icons/flaky-icon.ts
index a202c4fbb..7cb2b8ea7 100644
--- a/packages/lit-dev-content/src/icons/flaky-icon.ts
+++ b/packages/lit-dev-content/src/icons/flaky-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/forward-arrow-icon.ts b/packages/lit-dev-content/src/icons/forward-arrow-icon.ts
index a4377ee41..c805b8c21 100644
--- a/packages/lit-dev-content/src/icons/forward-arrow-icon.ts
+++ b/packages/lit-dev-content/src/icons/forward-arrow-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/github-logo.ts b/packages/lit-dev-content/src/icons/github-logo.ts
index 9845902c5..b7e81f823 100644
--- a/packages/lit-dev-content/src/icons/github-logo.ts
+++ b/packages/lit-dev-content/src/icons/github-logo.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/green-check-icon.ts b/packages/lit-dev-content/src/icons/green-check-icon.ts
index 539f0b2b9..ed6b3bde3 100644
--- a/packages/lit-dev-content/src/icons/green-check-icon.ts
+++ b/packages/lit-dev-content/src/icons/green-check-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/hashtag-icon.ts b/packages/lit-dev-content/src/icons/hashtag-icon.ts
index bcc8f7900..adf05de50 100644
--- a/packages/lit-dev-content/src/icons/hashtag-icon.ts
+++ b/packages/lit-dev-content/src/icons/hashtag-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/labs-icon.ts b/packages/lit-dev-content/src/icons/labs-icon.ts
index 7e792e239..9bd94417b 100644
--- a/packages/lit-dev-content/src/icons/labs-icon.ts
+++ b/packages/lit-dev-content/src/icons/labs-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/light-mode-icon.ts b/packages/lit-dev-content/src/icons/light-mode-icon.ts
index 274ea4b03..d0f1a72b3 100644
--- a/packages/lit-dev-content/src/icons/light-mode-icon.ts
+++ b/packages/lit-dev-content/src/icons/light-mode-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/loop-icon.ts b/packages/lit-dev-content/src/icons/loop-icon.ts
index 157695ddf..04a263f76 100644
--- a/packages/lit-dev-content/src/icons/loop-icon.ts
+++ b/packages/lit-dev-content/src/icons/loop-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/open-in-new-icon.ts b/packages/lit-dev-content/src/icons/open-in-new-icon.ts
index 3056e37b4..bf84fc678 100644
--- a/packages/lit-dev-content/src/icons/open-in-new-icon.ts
+++ b/packages/lit-dev-content/src/icons/open-in-new-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/paper-document-icon.ts b/packages/lit-dev-content/src/icons/paper-document-icon.ts
index c4f9a8ad5..d78e70a3f 100644
--- a/packages/lit-dev-content/src/icons/paper-document-icon.ts
+++ b/packages/lit-dev-content/src/icons/paper-document-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/red-x-icon.ts b/packages/lit-dev-content/src/icons/red-x-icon.ts
index f40b3c06b..3713808be 100644
--- a/packages/lit-dev-content/src/icons/red-x-icon.ts
+++ b/packages/lit-dev-content/src/icons/red-x-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/reset-icon.ts b/packages/lit-dev-content/src/icons/reset-icon.ts
index 4c8e6d685..df284e395 100644
--- a/packages/lit-dev-content/src/icons/reset-icon.ts
+++ b/packages/lit-dev-content/src/icons/reset-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/search-icon.ts b/packages/lit-dev-content/src/icons/search-icon.ts
index b48853108..433869a38 100644
--- a/packages/lit-dev-content/src/icons/search-icon.ts
+++ b/packages/lit-dev-content/src/icons/search-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/share-icon.ts b/packages/lit-dev-content/src/icons/share-icon.ts
index b8115e9f1..bd6852772 100644
--- a/packages/lit-dev-content/src/icons/share-icon.ts
+++ b/packages/lit-dev-content/src/icons/share-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/solve-icon.ts b/packages/lit-dev-content/src/icons/solve-icon.ts
index 617069ef3..20f188187 100644
--- a/packages/lit-dev-content/src/icons/solve-icon.ts
+++ b/packages/lit-dev-content/src/icons/solve-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/icons/yellow-bang-icon.ts b/packages/lit-dev-content/src/icons/yellow-bang-icon.ts
index 87b31ada9..66aec5626 100644
--- a/packages/lit-dev-content/src/icons/yellow-bang-icon.ts
+++ b/packages/lit-dev-content/src/icons/yellow-bang-icon.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/mods.ts b/packages/lit-dev-content/src/mods.ts
index 557b8b039..8f5bd9dec 100644
--- a/packages/lit-dev-content/src/mods.ts
+++ b/packages/lit-dev-content/src/mods.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/pages/design.ts b/packages/lit-dev-content/src/pages/design.ts
index a23cecb50..0a8bc16ac 100644
--- a/packages/lit-dev-content/src/pages/design.ts
+++ b/packages/lit-dev-content/src/pages/design.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
diff --git a/packages/lit-dev-content/src/pages/home-components.ts b/packages/lit-dev-content/src/pages/home-components.ts
index b211ae7b2..e64963429 100644
--- a/packages/lit-dev-content/src/pages/home-components.ts
+++ b/packages/lit-dev-content/src/pages/home-components.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/pages/learn.ts b/packages/lit-dev-content/src/pages/learn.ts
index c261306f5..7bc4231a5 100644
--- a/packages/lit-dev-content/src/pages/learn.ts
+++ b/packages/lit-dev-content/src/pages/learn.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/types/algolia.d.ts b/packages/lit-dev-content/src/types/algolia.d.ts
index 73341f491..367d19ade 100644
--- a/packages/lit-dev-content/src/types/algolia.d.ts
+++ b/packages/lit-dev-content/src/types/algolia.d.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/types/gtag.d.ts b/packages/lit-dev-content/src/types/gtag.d.ts
index 4e0fe4e38..ede4bcee6 100644
--- a/packages/lit-dev-content/src/types/gtag.d.ts
+++ b/packages/lit-dev-content/src/types/gtag.d.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/colors.ts b/packages/lit-dev-content/src/util/colors.ts
index 2fe30c21e..f0e77f8e9 100644
--- a/packages/lit-dev-content/src/util/colors.ts
+++ b/packages/lit-dev-content/src/util/colors.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2024 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/compact-playground-file.ts b/packages/lit-dev-content/src/util/compact-playground-file.ts
index a02baa4b2..9f908ae01 100644
--- a/packages/lit-dev-content/src/util/compact-playground-file.ts
+++ b/packages/lit-dev-content/src/util/compact-playground-file.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/gist-conversion.ts b/packages/lit-dev-content/src/util/gist-conversion.ts
index 4464fa972..984b30ac5 100644
--- a/packages/lit-dev-content/src/util/gist-conversion.ts
+++ b/packages/lit-dev-content/src/util/gist-conversion.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/gtag-helpers.ts b/packages/lit-dev-content/src/util/gtag-helpers.ts
index 2ccd5ba5d..1ac6c069e 100644
--- a/packages/lit-dev-content/src/util/gtag-helpers.ts
+++ b/packages/lit-dev-content/src/util/gtag-helpers.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/hydration-helpers.ts b/packages/lit-dev-content/src/util/hydration-helpers.ts
index d7f5da4f1..8e993cd4c 100644
--- a/packages/lit-dev-content/src/util/hydration-helpers.ts
+++ b/packages/lit-dev-content/src/util/hydration-helpers.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/render-algolia-suggestions.ts b/packages/lit-dev-content/src/util/render-algolia-suggestions.ts
index beb3b9d72..a0554611b 100644
--- a/packages/lit-dev-content/src/util/render-algolia-suggestions.ts
+++ b/packages/lit-dev-content/src/util/render-algolia-suggestions.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/safe-base64.ts b/packages/lit-dev-content/src/util/safe-base64.ts
index e767c098c..20dafec15 100644
--- a/packages/lit-dev-content/src/util/safe-base64.ts
+++ b/packages/lit-dev-content/src/util/safe-base64.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-content/src/util/url-helpers.ts b/packages/lit-dev-content/src/util/url-helpers.ts
index f27fc890e..cd8a26f61 100644
--- a/packages/lit-dev-content/src/util/url-helpers.ts
+++ b/packages/lit-dev-content/src/util/url-helpers.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-discord-bot/src/index.ts b/packages/lit-dev-discord-bot/src/index.ts
index d786c401e..b3aff06df 100644
--- a/packages/lit-dev-discord-bot/src/index.ts
+++ b/packages/lit-dev-discord-bot/src/index.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/content-security-policy-middleware.ts b/packages/lit-dev-server/src/middleware/content-security-policy-middleware.ts
index 408a8241d..d2eba8470 100644
--- a/packages/lit-dev-server/src/middleware/content-security-policy-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/content-security-policy-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/github-token-exchange-middleware.ts b/packages/lit-dev-server/src/middleware/github-token-exchange-middleware.ts
index a17eebd46..8647e5949 100644
--- a/packages/lit-dev-server/src/middleware/github-token-exchange-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/github-token-exchange-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/notfound-middleware.ts b/packages/lit-dev-server/src/middleware/notfound-middleware.ts
index 87807563e..320c0278b 100644
--- a/packages/lit-dev-server/src/middleware/notfound-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/notfound-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/playground-middleware.ts b/packages/lit-dev-server/src/middleware/playground-middleware.ts
index 6492e290d..cbf2f57be 100644
--- a/packages/lit-dev-server/src/middleware/playground-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/playground-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/redirect-middleware.ts b/packages/lit-dev-server/src/middleware/redirect-middleware.ts
index 46a958132..3cfe93725 100644
--- a/packages/lit-dev-server/src/middleware/redirect-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/redirect-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/middleware/tutorials-middleware.ts b/packages/lit-dev-server/src/middleware/tutorials-middleware.ts
index 727d0413f..65fa8ca41 100644
--- a/packages/lit-dev-server/src/middleware/tutorials-middleware.ts
+++ b/packages/lit-dev-server/src/middleware/tutorials-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/redirects.ts b/packages/lit-dev-server/src/redirects.ts
index 3c2ca4aaf..223f8664b 100644
--- a/packages/lit-dev-server/src/redirects.ts
+++ b/packages/lit-dev-server/src/redirects.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-server/src/server.ts b/packages/lit-dev-server/src/server.ts
index 23da80b89..5d978cab3 100644
--- a/packages/lit-dev-server/src/server.ts
+++ b/packages/lit-dev-server/src/server.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/check-broken-links.ts b/packages/lit-dev-tests/src/check-broken-links.ts
index f201140dd..9a7742720 100644
--- a/packages/lit-dev-tests/src/check-broken-links.ts
+++ b/packages/lit-dev-tests/src/check-broken-links.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/check-no-todos.ts b/packages/lit-dev-tests/src/check-no-todos.ts
index 59e1139f5..25702b738 100644
--- a/packages/lit-dev-tests/src/check-no-todos.ts
+++ b/packages/lit-dev-tests/src/check-no-todos.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/check-redirects.ts b/packages/lit-dev-tests/src/check-redirects.ts
index ed493ac44..03871db54 100644
--- a/packages/lit-dev-tests/src/check-redirects.ts
+++ b/packages/lit-dev-tests/src/check-redirects.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright.config.ts b/packages/lit-dev-tests/src/playwright.config.ts
index 0277f7f66..fa2ea55ae 100644
--- a/packages/lit-dev-tests/src/playwright.config.ts
+++ b/packages/lit-dev-tests/src/playwright.config.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/components-styles.spec.ts b/packages/lit-dev-tests/src/playwright/components-styles.spec.ts
index 81f1b86be..413367b53 100644
--- a/packages/lit-dev-tests/src/playwright/components-styles.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/components-styles.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/home.spec.ts b/packages/lit-dev-tests/src/playwright/home.spec.ts
index f8cfe6574..9c50efc34 100644
--- a/packages/lit-dev-tests/src/playwright/home.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/home.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/learn.spec.ts b/packages/lit-dev-tests/src/playwright/learn.spec.ts
index 369ac0118..fec335812 100644
--- a/packages/lit-dev-tests/src/playwright/learn.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/learn.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/playground.spec.ts b/packages/lit-dev-tests/src/playwright/playground.spec.ts
index 4a476c9b4..24fe03fc7 100644
--- a/packages/lit-dev-tests/src/playwright/playground.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/playground.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/tutorials.spec.ts b/packages/lit-dev-tests/src/playwright/tutorials.spec.ts
index 1253dc10d..c8d518580 100644
--- a/packages/lit-dev-tests/src/playwright/tutorials.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/tutorials.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/unversioned.spec.ts b/packages/lit-dev-tests/src/playwright/unversioned.spec.ts
index cc91d426d..d7e3def04 100644
--- a/packages/lit-dev-tests/src/playwright/unversioned.spec.ts
+++ b/packages/lit-dev-tests/src/playwright/unversioned.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tests/src/playwright/util.ts b/packages/lit-dev-tests/src/playwright/util.ts
index 37a9ca973..8ca6167ad 100644
--- a/packages/lit-dev-tests/src/playwright/util.ts
+++ b/packages/lit-dev-tests/src/playwright/util.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-2.ts b/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-2.ts
index dd61c39bd..afade0491 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-2.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-2.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-3.ts b/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-3.ts
index a6cbb76cb..b60293a09 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-3.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/configs/lit-3.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/generate.ts b/packages/lit-dev-tools-cjs/src/api-docs/generate.ts
index 6a07d53a1..cb21fc4a7 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/generate.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/generate.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/transformer.spec.ts b/packages/lit-dev-tools-cjs/src/api-docs/transformer.spec.ts
index 2ebd0f1f6..f4fc583dd 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/transformer.spec.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/transformer.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/transformer.ts b/packages/lit-dev-tools-cjs/src/api-docs/transformer.ts
index 7b508e48c..d62cc1666 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/transformer.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/transformer.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/api-docs/types.ts b/packages/lit-dev-tools-cjs/src/api-docs/types.ts
index bf57fea3d..1a3e52a0a 100644
--- a/packages/lit-dev-tools-cjs/src/api-docs/types.ts
+++ b/packages/lit-dev-tools-cjs/src/api-docs/types.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/lit-dev-environments.ts b/packages/lit-dev-tools-cjs/src/lit-dev-environments.ts
index 2c9be59e3..c62fd86cc 100644
--- a/packages/lit-dev-tools-cjs/src/lit-dev-environments.ts
+++ b/packages/lit-dev-tools-cjs/src/lit-dev-environments.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/playground-inline.ts b/packages/lit-dev-tools-cjs/src/playground-inline.ts
index 6ecf49594..7d26e367f 100644
--- a/packages/lit-dev-tools-cjs/src/playground-inline.ts
+++ b/packages/lit-dev-tools-cjs/src/playground-inline.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer-worker.ts b/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer-worker.ts
index 94fdf759e..4e1dfe8fb 100644
--- a/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer-worker.ts
+++ b/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer-worker.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer.ts b/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer.ts
index 3225ef97f..556ac65cd 100644
--- a/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer.ts
+++ b/packages/lit-dev-tools-cjs/src/playground-plugin/blocking-renderer.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/playground-plugin/plugin.ts b/packages/lit-dev-tools-cjs/src/playground-plugin/plugin.ts
index 9a947842b..4fbd6b7c7 100644
--- a/packages/lit-dev-tools-cjs/src/playground-plugin/plugin.ts
+++ b/packages/lit-dev-tools-cjs/src/playground-plugin/plugin.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/playground-plugin/renderer.ts b/packages/lit-dev-tools-cjs/src/playground-plugin/renderer.ts
index 76f0cc2fa..4a6505f49 100644
--- a/packages/lit-dev-tools-cjs/src/playground-plugin/renderer.ts
+++ b/packages/lit-dev-tools-cjs/src/playground-plugin/renderer.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2020 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/pre-compress.ts b/packages/lit-dev-tools-cjs/src/pre-compress.ts
index f7e9526a0..210e1383a 100644
--- a/packages/lit-dev-tools-cjs/src/pre-compress.ts
+++ b/packages/lit-dev-tools-cjs/src/pre-compress.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.spec.ts b/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.spec.ts
index d181e7c19..37e5d58bc 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.spec.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.spec.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.ts b/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.ts
index 7e74856ff..a146fe92f 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/PageSearchChunker.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-api.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-api.ts
index f4ca1c9d1..8d58ad07a 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-api.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-api.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-articles.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-articles.ts
index 2f73714ff..9f30c7a0d 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-articles.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-articles.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-docs.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-docs.ts
index 03460ce56..75cfba46d 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-docs.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-docs.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-external-data.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-external-data.ts
index 887fb9840..33c4ab515 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-external-data.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-external-data.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-tutorials.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-tutorials.ts
index 4bc1d5e63..d256419c5 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-tutorials.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-tutorials.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index-videos.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index-videos.ts
index 9e0d89eca..9587d48f6 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index-videos.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index-videos.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/index.ts b/packages/lit-dev-tools-cjs/src/search/indexers/index.ts
index f5c762ef9..17c0bb4f2 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/index.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/index.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/keywords.ts b/packages/lit-dev-tools-cjs/src/search/indexers/keywords.ts
index da9cb6c5c..4221bf882 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/keywords.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/keywords.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2025 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/indexers/utils.ts b/packages/lit-dev-tools-cjs/src/search/indexers/utils.ts
index 6c6113ee0..dafb4f945 100644
--- a/packages/lit-dev-tools-cjs/src/search/indexers/utils.ts
+++ b/packages/lit-dev-tools-cjs/src/search/indexers/utils.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-cjs/src/search/plugin.ts b/packages/lit-dev-tools-cjs/src/search/plugin.ts
index a98e1a226..9b4927392 100644
--- a/packages/lit-dev-tools-cjs/src/search/plugin.ts
+++ b/packages/lit-dev-tools-cjs/src/search/plugin.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/build-unversioned-docs.ts b/packages/lit-dev-tools-esm/src/build-unversioned-docs.ts
index 0610b8c42..bd81650d1 100644
--- a/packages/lit-dev-tools-esm/src/build-unversioned-docs.ts
+++ b/packages/lit-dev-tools-esm/src/build-unversioned-docs.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2023 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/dev-server.ts b/packages/lit-dev-tools-esm/src/dev-server.ts
index 107c15ddb..84e810daf 100644
--- a/packages/lit-dev-tools-esm/src/dev-server.ts
+++ b/packages/lit-dev-tools-esm/src/dev-server.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/fake-github-middleware.ts b/packages/lit-dev-tools-esm/src/fake-github-middleware.ts
index 4acd33e3e..d8863b532 100644
--- a/packages/lit-dev-tools-esm/src/fake-github-middleware.ts
+++ b/packages/lit-dev-tools-esm/src/fake-github-middleware.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/fake-github-server.ts b/packages/lit-dev-tools-esm/src/fake-github-server.ts
index db6b87d2e..2fb3ef792 100644
--- a/packages/lit-dev-tools-esm/src/fake-github-server.ts
+++ b/packages/lit-dev-tools-esm/src/fake-github-server.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/generate-js-samples.ts b/packages/lit-dev-tools-esm/src/generate-js-samples.ts
index f1c61a137..126855789 100644
--- a/packages/lit-dev-tools-esm/src/generate-js-samples.ts
+++ b/packages/lit-dev-tools-esm/src/generate-js-samples.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/typescript-util.ts b/packages/lit-dev-tools-esm/src/typescript-util.ts
index d82b2694f..3200784c2 100644
--- a/packages/lit-dev-tools-esm/src/typescript-util.ts
+++ b/packages/lit-dev-tools-esm/src/typescript-util.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2021 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */
diff --git a/packages/lit-dev-tools-esm/src/upload-algolia-index.ts b/packages/lit-dev-tools-esm/src/upload-algolia-index.ts
index ff65f6f76..2e85ecac7 100644
--- a/packages/lit-dev-tools-esm/src/upload-algolia-index.ts
+++ b/packages/lit-dev-tools-esm/src/upload-algolia-index.ts
@@ -1,5 +1,6 @@
 /**
  * @license
+ * Copyright The Lit Project
  * Copyright 2022 Google LLC
  * SPDX-License-Identifier: BSD-3-Clause
  */