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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.
They are allegedly learning from copyrighted material, there is no actual proof that they have been trained on the actual material, or just snippets that have been published online. And it would be illegal for them to be trained on full copyrighted materials, because it is protected by laws that prevent that.