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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.
Your probability of getting copyright strike depends on two major factors -
• How similar your story is to Harry Potter.
• If you are making money of that story.
It doesn't matter how similar. Copyright doesn't protect meaning, copyright protect form. If you read HP and then draw a picture of it, said picture becomes its separate work, not even derivative.