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OpenAI now tries to hide that ChatGPT was trained on copyrighted books, including J.K. Rowling's Harry Potter series
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
"Learn" is debatable in this usage. It is trained on data and the model creates a set of values that you can apply that produce an output similar to human speach. It's just doing math though. It's not like a human learns. It doesn't care about context or meaning or anything else.
Okay, but in the context of this conversation about copyright I don't think the learning part is as important as the reproduction part.