A major copyright lawsuit against Meta has revealed a trove of internal communications about the company’s plans to develop its open-source AI models, Llama, which include discussions about avoiding “media coverage suggesting we have used a dataset we know to be pirated.”The messages, which were part of a series of exhibits unsealed by a California court, suggest Meta used copyrighted data when training its AI systems and worked to conceal it — as it raced to beat rivals like OpenAI and Mistral....