Creative works are not scientific expressions, in the main. There have been successful copyright cases, where someone creates something new, but it contains so

Creative works are not scientific expressions, in the main. There have been successful copyright cases, where someone creates something new, but it contains something that has been created before. A character, like Mickey Mouse, or some other player. The entire work is new, undeniably, and it is still a violation of the rights of the copyright owner. Fan Fiction is fine, but only within some very strong restrictions. You can't turn around and create a new product out of it, without undertaking some very careful changes first. Fan Fiction isn't copying any sentences. No pixels. But it can still be stealing, if you step a foot wrong. If you allow your AI to be trained on non-free data - the copyright question of whether it is now safe to use as a product, is not yet fully determined.