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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.
It's not a problem that it reads something. The problem is the thing that it produces should break copyright. Google search is not producing something, it reads everything to link you to that original copyrighted work. If it read it and then just spit out what's read on its own, instead of sending you to the original creators, that wouldn't be OK.
How is it reproducing the works
The blurb it puts out in the search results is much more directly "spitting out what's read" than anything an LLM does. As are most other srts of results that appear on the front page of a google search.