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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.
If they purchased the data or the data is free its theirs to do what they want without violating the copyright like reselling the original work as their own. Training off it should not violate any copyright if the work was available for free or purchased by at least one person involved. Capitalism should work both ways