The Open Art License , by the Open Art Network. I don’t think we need another art license. If people want a GPL-style license for art, one that requires that sources be provided, they should probably just use the GPL. GnuArt do this. If you don’t want to provide sources, the Creative Commons licenses are best. There have been other attempts at art licenses. The Free Art License has been out for a while now, and I drafted (but fortunately never used) a BSD-style art license a few years back.
Let’s not divide culture up into little content ghettos around strangely similar yet strangely incompatible licenses.