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The publishers’ case reaches beyond Claude’s alleged lyric outputs to the route by which copyrighted material entered Anthropic’s systems—and seeks records that could tie those decisions to its co-founders.
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The August 28 complaint broadens the copyright fight around Claude from model outputs to the alleged acquisition and retention of training material. Sony Music Publishing, Warner Chappell and other publishers claim Anthropic obtained millions of pirated books and tens of thousands of musical works, and seek up to $150,000 per work, a data-and-methods accounting, and destruction of infringing copies. The case names Dario Amodei and Benjamin Mann personally.
The complaint alleges Mann downloaded at least 5 million Library Genesis books in June 2021 using BitTorrent.
Anthropic employees allegedly obtained at least 2 million additional books from Pirate Library Mirror in July 2022.
Publishers allege Claude can reproduce protected lyrics verbatim or nearly verbatim after repeated prompts.
Sony Music Publishing, Warner Chappell Music and other publishers have sued Anthropic and co-founders Dario Amodei and Benjamin Mann, alleging that copyrighted material was obtained without authorization and used to develop and operate Claude. The complaint seeks up to $150,000 for each work allegedly infringed willfully, placing Anthropic’s data pipeline—and the founders’ alleged involvement—at the center of the dispute.
The suit, filed August 28 in the U.S. District Court for the Northern District of California, alleges that Anthropic used torrenting, scraping and downloads to acquire copyrighted books, lyrics and musical compositions. It says the material was then used to train and operate Claude. These allegations have not been adjudicated.
That sequence matters because the publishers are not limiting their case to what Claude may return to users. They challenge the alleged acquisition, retention and use of the underlying material. The complaint also alleges that Claude can reproduce protected lyrics verbatim or nearly verbatim after repeated prompts.
The complaint alleges that Benjamin Mann downloaded the books from Library Genesis using BitTorrent.
The complaint alleges that Anthropic employees downloaded the books from Pirate Library Mirror.
Anthropic faces direct-infringement claims. Amodei and Mann face direct and contributory-infringement claims, according to the complaint. The publishers allege Amodei authorized acquisition of pirated material and Mann personally downloaded some material before directing employees to collect more.
The publishers are seeking an accounting of Claude’s training data and methods, along with court-supervised destruction of infringing copies. That relief would require a detailed record of the material they say entered Anthropic’s systems and how the company handled it.
The suit follows the separate Bartz v. Anthropic book case, in which a federal judge ruled that training on lawfully acquired books could qualify as fair use but that fair use did not excuse downloading and retaining pirated copies in a central library. Anthropic later agreed to pay at least $1.5 billion to settle claims from authors and publishers.
Sony and Warner’s complaint applies that acquisition-focused theory to musical works. Its large damages request does not itself establish liability: the publishers will need to connect particular compositions to valid copyrights and specific alleged infringement, and prove the roles they assign to each founder. Anthropic had not responded to TechCrunch before publication.
Editorial analysis
This case is built to turn a broad dispute over AI training into a traceability test. The requested accounting of Claude’s training data and methods could force attention onto who obtained material, where it was stored, and whether it was licensed. The earlier Bartz ruling makes that acquisition question especially important: it distinguished training on lawfully acquired books from retaining pirated copies. The next consequential event is not a headline damages number. It is whether the publishers can connect specific compositions, alleged copying acts, and the founders’ individual roles well enough to sustain those claims.
Citation desk / original work
This case is built to turn a broad dispute over AI training into a traceability test.
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