Law professors and publishing groups have filed amicus briefs against Meta Platforms Inc. in a landmark lawsuit concerning the company's use of copyrighted works for training its generative AI models. These briefs argue that Meta's claims of fair use should be rejected, highlighting the potential implications for AI copyright laws and practices. The conflict underscores the stakes involved for authors and copyright owners, with warnings about possible detrimental consequences for the future of AI development. Meanwhile, the California attorney general's office has decided not to join Elon Musk's lawsuit against OpenAI, stating that the action does not serve the public interest of the state.