Is it legally possible to create a copyleft license that automatically forces all derivatives to have the same license?
It would be an art license, not a software license, if that makes any difference. I know the GPL is often accused of doing this, but I was wondering if it was actually legally possible.
For example: I make an image and put it under my "superviral" license. Somebody else creates a derivative and posts it to deviantart or flickr or some such place. Their derivative work is automatically under the superviral license simply because they created and distributed a derivative. Even if they don't put a superviral license notice, it would still be under that license whether or not they wanted it to be.