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Concord Music Group, Inc. et al v. Anthropic PBC

  1. April 21, 2026

    Anthropic Pushes Fair Use Defense In Music Cos.' IP Fight

    Anthropic PBC has asked a California federal judge to find that its use of copyrighted materials to train its tool Claude is "transformative" fair use under copyright law, comparing Claude's learning to how humans learn from reading and internalizing the themes of various works.

  2. March 24, 2026

    Publishers Say Anthropic's Use Of Lyrics Violates Copyrights

    Music publishers have asked a California federal judge to rule that Anthropic infringed their copyrighted song lyrics through its Claude large language model, arguing in a motion for partial summary judgment that fair use does not excuse the AI developer's conduct because it used those lyrics to build a competing commercial product.

  3. January 28, 2026

    Anthropic Hit With 2nd Music IP Suit, This Time For $3B

    Major music publishers already suing Anthropic for copyright infringement filed a second, $3 billion suit against the artificial intelligence company on Wednesday, a move they say is necessary to hold Anthropic accountable for "brazen," newly discovered mass infringement of sheet music and songbooks.

  4. December 16, 2025

    Anthropic Seeks Music Publishers' Claude IP Testing Data

    Anthropic urged a California federal judge during a hearing Tuesday to order music publishers to produce the prompts and outputs their investigators used to test whether the Claude AI chatbot was infringing song lyrics, while the publishers slammed Anthropic's request as an overbroad third attempt to pierce work-product protections.

  5. October 06, 2025

    Music Publishers Can Pursue Copyright Suit Against Anthropic

    Music publishers accusing Anthropic of using their songs' lyrics to train its artificial intelligence chatbot can pursue previously dismissed copyright claims, after a California federal judge said Monday that their updated complaint plausibly alleges that Anthropic knew people were using its AI system to create song lyrics.

  6. August 07, 2025

    Music Publishers Denied Anthropic User Info In AI Case

    A California federal judge on Thursday denied a request from music publishers for the names of people who used Anthropic PBC's generative text tool Claude to get copyrighted lyrics, saying she was not persuaded that production of personal third-party user information was needed for the infringement litigation.

  7. May 27, 2025

    Anthropic Declaration Partly Stricken Over AI Hallucination

    A California federal magistrate judge has partially stricken an expert report filed by Anthropic in copyright infringement litigation that cited a nonexistent study — an error created by the artificial intelligence company's own Claude AI tool — calling the issue "serious," but "not quite so grave as it first appeared."

  8. May 16, 2025

    Anthropic's AI-Hallucinated Errors Taint Filing, Publishers Say

    Music publishers suing Anthropic for copyright infringement accused the artificial intelligence company on Friday of downplaying the seriousness of errors in a filing caused by Anthropic's own Claude AI tool, saying the company's counsel violated a judge's standing order and arguing that the filing at issue should be tossed.

  9. May 15, 2025

    Anthropic's Atty Says Client's Own AI Created Error In Filing

    A Latham & Watkins LLP associate representing Anthropic in the artificial intelligence company's copyright fight with music publishers said Thursday that she used Anthropic's own Claude.ai tool to help draft an expert's declaration that included an erroneous citation, but she argued the error was "an honest citation mistake and not a fabrication of authority."

  10. May 13, 2025

    Did AI Co. Anthropic's Expert Cite AI-Hallucinated Study?

    Music publishers claiming artificial intelligence company Anthropic infringed their works to train its AI models told a California federal magistrate judge Tuesday that an Anthropic expert witness cited a "fictitious" AI-generated study in a recently filed declaration, urging the judge to sanction the company's Latham & Watkins attorneys for not catching the issue.