I realize this is an old post, but just wanted to point out, you can now copyright Ai art. It's absolutely exploded and there's no stopping it. The point is to work with the tech, rather than against it, because it will soon branch into animation, and will just keep getting better. Imagine having Ai that can animate your Poser and DAZ OCs without all the hassle of keyframes. 

https://www.creativebloq.com/news/ai-art-copyright