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AllegationMarch 23, 2026Concord Music Group, Inc. v. Anthropic PBC (Concord I) · N.D. Cal., No. 5:24-cv-03811 (Judge Eumi K. Lee)

Music publishers ask Judge Lee to rule that Anthropic infringed lyrics to 499 songs by training Claude on them and in its outputs, and that neither use is fair use

Universal, Concord and ABKCO music publishers moved for partial summary judgment against Anthropic on March 23, 2026 (Dkt. 594, redacted; a fuller public version was refiled Sept. 22, 2026 as Dkt. 808). They say Anthropic copied the lyrics to all 499 songs in suit to train Claude, and that Claude then reproduced those lyrics, distorted versions of them and AI-written substitutes on request. They argue the use is not fair use because Anthropic trained Claude so it could answer requests for lyrics, and because AI-generated lyrics flood streaming services and dilute the market for human-written songs. They distinguish the Bartz and Kadrey fair-use rulings, saying those plaintiffs showed no infringing output. They quote CEO Dario Amodei saying models "shouldn't output copyrighted content" because it is illegal, and say Anthropic added copyright guardrails only after the suit. These are the publishers' claims; the motion was argued Oct. 21, 2026 and the court has not ruled.

Publishers' motion for partial summary judgment, public refiling (Dkt. 808, PDF) ↗Original redacted version (Dkt. 594, PDF) ↗

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