How to check copyright?

I can't point you to the law(s) themselves, but the European position - IN LAW - is that there is no difference between an AI reading and learning, and a person reading and learning.

So I guess (and this is not clear) that there is no difference between an AI regurgitating what it's learnt, and a person regurgitating what it's learnt.

So it basically comes down to the question "how close is the output to the input, and was the output obvious and not worthy of copyright protection?"

Given the tendency of AI to hallucinate, I guess the output of an AI is LESS likely to violate copyright than that of a human. Of course, the corollary becomes the output of a human is more valuable :-)

Cheers,
Wol