Hi. I'm comparing the old copyright file from Osamu with yours and found this:
-License: GPL-3.0+ +License: GPL-3+ I'm Cc:ing Osamu here as the maintainer of debmake. I asked my LLM of choice and it told me some interesting things, which of course I should take with a grain of salt but it makes sense to me: GPL-3+ is the canonical DEP-5 / Debian shortname. The + suffix is DEP-5's own convention for "or later." This is what the DEP-5 spec itself uses in its examples, and it directly corresponds to the file /usr/share/common-licenses/GPL-3. GPL-3.0+ comes from the SPDX identifier namespace. Ironically, it's not even the current SPDX form — SPDX deprecated GPL-3.0+ in favour of GPL-3.0-or-later. So GPL-3.0+ is an awkward middle ground: not the Debian native form, and not the current SPDX form either. The question: Is there a reason why debmake -k does not use the short form GPL-3+? What is the preferred license checking/validator program for people who use GPL-3+ in their d/copyright files? Thanks.
