Here's one I hadn't be aware of before, the EUPL, European Union Public
which affects something I was
considering packaging. It does have in it an explicit ...
Compatibility clause: If the Licensee Distributes ... derivative
Works ... this Distribution ... can be done under the terms of
this Compatible Licence.
“Compatible Licences” according to article 5 EUPL are:
− General Public License (GPL) v. 2
− Open Software License (OSL) v. 2.1, v. 3.0
− Common Public License v. 1.0
− Eclipse Public License v. 1.0
− Cecill v. 2.0