Package: modemmanager Version: 1.24.0-1+deb13u1 The Debian Copyright File lists the files in cli/* as GPL-3.0+. This seems to be incorrect, at least for the current state of the repository.
Looking at the source code, none of the files in the cli directory list GPL Version 3, only Version 2 or later. Also: - the license section in the README.md only mentions GPLv2+ and LGPLv2+ - COPYING contains the licensing text of GPLv2
