Hello togehter,
I am the upstream author of "spdx2debian" and beside of that not
involved in Debian Maintaining.
The resue-tool itself "ignores" license files when validating the
SPDX-compliance of a project.
As some of you pointed out it is tricky to add a license to a license
file. So why not exclude license files from lintian (and other similiar
tools) and modify the Debian policy accordingly.
Adding a license to a license feels like a workaround to me.
On the other hand, "reuse-tool" does not recognize "d/copyright" as a
license file, so it warns if there is no license for that file.
Therefore, "spdx2debian" currently generates a license file for it using
"CC0-1.0" as license and "None" as copyright holder. It is also a
workaround.
Regards,
Christian Buhtz