I mean if we are getting all legally and what not, I have background in art vs legal system since I had to do a paper dealing with copyright claims in the art world while I went to art school.
Rogers vs Koon was a court case about this image vs this sculpture
Courts ruled in favor of rogers ( the photographer ) and not in favor of the Jeff Koons ( the cunt ), just because it is adapted into a new medium and changed, doesn't mean anything, it's a blatant rip off, and against the law. I hope the original artist takes him for everything. He has 10 days before valve just doesn't care anymore, I wish him the best of luck.
EDIT: Should say I never studied anymore art vs legal system cases after this one, so I could be talking out of my ass.