Anthropic, a company backed by Amazon and Alphabet, has been training its AI chatbot Claude using millions of copyrighted books, including over 7 million pirated ones. A judge ruled that Anthropic's use of copyrighted books to train its AI models is fair use, but downloading pirated copies is not. The company had spent millions of dollars buying used print books, which were then scanned and discarded. The case highlights the ongoing debate over AI copyright and fair use.