[Libexif-devel] libexif now REUSE compliant

[Dan F. <da...@co...>]

I've finished digging through source history of every file in the libexif repo
to figure out its copyright and licensing status, and I'm happy to report that
libexif is now REUSE compliant. REUSE [1] is an initiative of the FSF Europe to
make free software licensing more clear and easier for users to comply with.
There is now unobtrusive machine-readable metadata in the repo that makes it
possible for users to use tools to ensure that the LGPL source and object
releasing requirements are being met of all their REUSE compliant Open Source
software.

While libexif as a whole is released under the LGPL2+, it turns out there are
actually seven different licenses that cover various parts of the project [2].
A GitHub Actions job [3] runs on every PR and commit to ensure that any new
files added to the project have clear licensing and copyright annotations.
If this job returns a failure, make sure any new files have an accurate
copyright line as well as a SPDX-License-Identifier: line appropriate for the
desired license.

This should make it easier for people to use libexif in new projects while
fulfilling their obligations under the LGPL.

Dan

[1]: https://reuse.software/
[2]: https://github.com/libexif/libexif/tree/master/LICENSES
[3]: https://github.com/libexif/libexif/actions/workflows/reuse.yml