You can modify or add extra terms to the GPL, they even have templates: https://www.gnu.org/licenses/gpl-faq.en.html#GPLIncompatibleLibs https://www.gnu.org/lic

You can modify or add extra terms to the GPL, they even have templates: https://www.gnu.org/licenses/gpl-faq.en.html#GPLIncompatibleLibs https://www.gnu.org/licenses/gpl-faq.en.html#GPLIncompatible... Totem has an example https://gitlab.gnome.org/GNOME/totem/-/blob/b4050524d6cd961b544ba834451a6c67e9142cc9/COPYING https://gitlab.gnome.org/GNOME/totem/-/blob/b4050524d6cd961b...