Comment by joegibbs

I think it would be very, very difficult - almost impossible - to create a dataset to train an image generator that doesn't contain any copyrighted material that you don't have the rights to. There's the obvious stuff like Mickey Mouse or Superman, you just run some other tool over it to filter them out, but there are so many ridiculous things that can be copyrighted (depictions of buildings, tattoos), things like crowd shots, pictures of cities that have ads in the background, that I don't know how you could do it. I'm sure even Adobe's stock library would have a lot of violations like that.