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YouTube creator sues Nvidia and OpenAI for ‘unjust enrichment’ for using their videos for AI training
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Your definition implies Andy Warhol wasn't creative.
I think they are considered derivative, and are not protected. Not that he wasn't creative, just that his work wasn't so creative to be independently copyrightable. I'm a little rusty on my IP law.