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OpenAI copyright lawsuits must stick mostly to existing claims, US judge rules

By Samuel Rubenfeld and Emma Whitford ( May 22, 2025, 21:01 GMT | Insight) -- A US judge has blocked book authors from introducing most new claims against Microsoft and OpenAI, including an antitrust accusation, in a consolidated proposed class action alleging copyright infringement by artificial intelligence models. Ruling from the bench during a case management conference today, US Judge Sidney Stein said that allowing additional claims would cause significant delays.A US judge has blocked book authors from introducing most new claims against Microsoft and OpenAI, including an antitrust accusation, in two proposed class actions alleging copyright infringement by artificial intelligence models....

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