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If you are holding copyright to something, it will be on you to prove it's in there.

I am obviously clueless, but if it's a case, can't one demand what the training data is?

Based on what case law? In what jurisdiction?

It's very easy to show the models generating near-identical data to copyrighted data, which is enough to get courts to force them to allow discovery.

This not have happened all over the place yet is evidence against this being as easy as you make it sound.