Please clarify the license for boostbook/xsl/caramel

[jwakely]

The directory contains this license file, which seems to be a form of the MTLL license:
https://github.com/boostorg/boostbook/blob/develop/xsl/caramel/LICENSE

However, the other three files in that directory all say:

Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)

So which is it? If those files are distributed under BSL-1.0 then why is the other license file there?

This complicates things for downstream packagers like Linux distros, who need to audit and record all relevant licenses used by a package.

[jwakely]

So which is it? If those files are distributed under BSL-1.0 then why is the other license file there?

And if those files really are covered by that license file, then they shouldn't claim otherwise.

[Lastique]

I think this should be addressed to @DougGregor as, according to history, he was the one who added these files.