License

While moving the RPM package from RPM Fusion to Fedora proper, the reviewer asked me to check the license with you.

Is it GPL-3.0-only or GPL-3.0-or-later?

File headers seem to have had the "or later" removed incompletely. For example: https://gitlab.com/rastersoft/devedeng/-/blob/master/src/devedeng/avbase.py?ref_type=heads#L9