Sony Music and Warner Chappell Sue Anthropic Over Alleged Mass Copyright Infringement in Claude Training

Sony Music Publishing, Warner Chappell Music and numerous affiliated publishers sued Anthropic in the U.S. District Court for the Northern District of California on Aug. 28, accusing the Claude developer of widespread copyright infringement. Anthropic co-founders Dario Amodei and Benjamin Mann are also named as defendants in claims tied to the alleged acquisition of copyrighted works.

The complaint describes the conduct as “one of the largest and most blatant ongoing thefts of intellectual property in history.” The case includes Sony, Warner Chappell and a broad group of publishing entities, with 38 parties listed in the court docket. The allegations place Anthropic at the center of another major legal fight over how AI companies obtain and use copyrighted material.

The publishers allege Anthropic used torrenting, scraping and direct downloads to obtain copyrighted music, then used that material in developing and training Claude. The complaint describes “thousands upon thousands” of songs and argues that the alleged conduct amounted to a systematic campaign rather than isolated copying.

Specific works cited in coverage include “Eye of the Tiger,” illustrating the type of commercially significant repertoire at issue. The legal claims reportedly include direct copyright infringement, infringement tied to torrenting, contributory infringement allegations against Amodei and Mann, and claims involving the removal or alteration of copyright-management information.

The case carries substantial financial exposure because U.S. copyright law allows statutory damages of up to $150,000 for each work infringed when the violation is found to be willful. Business Insider reported that the publishers are seeking that maximum figure per song, while Music Business Worldwide characterized the action as a multibillion-dollar lawsuit.

The size of the potential award depends on which works, acts and legal theories survive the case. A large catalog of songs can produce enormous headline figures before questions about liability, registration, damages and the scope of any injunction are resolved. The publishers’ approach also signals that music rights owners are treating AI training as a major licensing and enforcement issue, not a narrow dispute over model outputs.

The Sony and Warner Chappell case follows earlier litigation accusing Anthropic of using copyrighted lyrics without permission. A separate lawsuit filed in January by Universal Music Publishing Group, Concord Music Group, ABKCO Music and other publishers sought more than $3 billion over alleged infringement involving more than 20,000 songs.

Together, the cases show how music publishers are building pressure around both the inputs used to train AI systems and the ways models reproduce protected text. The disputes also resemble copyright lawsuits filed against other large AI companies by authors, news organizations and publishers. Anthropic’s legal exposure therefore extends beyond a single catalog or plaintiff group, while the industry is testing several theories of liability at once.

The central commercial question is whether AI developers must obtain licenses before using copyrighted songs and lyrics in model development. Music publishers control extensive rights in compositions, including lyrics and musical works, making their catalogs especially valuable for training systems that generate, summarize or transform text.

A court ruling on Anthropic’s alleged torrenting and copying practices won't settle every dispute over AI training, but it can shape negotiations across the sector. Publishers are seeking compensation and controls over catalog use, while AI companies face pressure to document data practices, prevent memorization and establish permission-based training pipelines. The outcome will matter to developers, rights holders and businesses integrating Claude into products.

The lawsuit will proceed through motions, discovery and arguments over the scope of the alleged copying, the role of the individual defendants and the damages available for each work. The court docket identifies Anthropic, Amodei and Mann as defendants and Sony Music Publishing and affiliated publishers among the plaintiffs.

The case also adds urgency to ongoing negotiations between AI companies and copyright owners. If publishers secure meaningful damages or restrictions, licensing costs and data-governance requirements will rise across generative AI. If Anthropic defeats major claims, developers will gain a stronger defense against some training-data theories, though disputes over unauthorized downloads, torrenting and copyright-management information would remain central.