Anthropic, an Amazon-backed AI developer, is being sued by a group of authors for using pirated and copyrighted materials to train its chatbot, Claude. The lawsuit also claims that Anthropic is depriving authors of revenue by enabling the creation of AI-generated lookalikes of their books. This is the first time Anthropic has been sued by writers, but the company is also facing a legal challenge from music publishers. The case comes at a time when large language models have made it easier to generate rip-offs of copyrighted works.