Royalty free isn't good enough, it needs to be a FOSS compatible license or too many free (as in libre) OS's and applications won't be able to support it. Furth

Royalty free isn't good enough, it needs to be a FOSS compatible license or too many free (as in libre) OS's and applications won't be able to support it. Further to that point, the code itself needs to be free in order for users to have guarantees they own the ability, for all time, to decode files. If they don't have decode guarantees, then images can in effect become locked; either legally or practically. And that's not something the world should tolerate.