Authors sue Anthropic for $75 million over alleged pirated books used to train Claude
More than 100 authors filed a $75 million lawsuit against Anthropic in June 2026, alleging the company downloaded over 500 pirated books from illegal libraries to train Claude without permission or payment. The authors argue that downloading from pirate sources constitutes copyright infringement distinct from the fair use protection applied to legally acquired training material.
What happened
More than 100 authors filed a lawsuit in Northern California District Court on June 17, 2026, accusing Anthropic of downloading more than 500 pirated books from shadow libraries including Library Genesis and Pirate Library Mirror to train Claude. The authors claim Anthropic used BitTorrent to access these illegal websites and uploaded the works to its 'vast central library' for use in training the AI model.
Reported impact
The authors argue that the alleged infringement harmed them by allowing Anthropic to use their creative works without licensing or payment. They claim that existing statutory damages frameworks undervalue the scale of infringement, noting that prior settlements paid authors approximately $3,000 per work while copyright law allows up to $150,000 per willfully infringed work.
Index analysis
The lawsuit distinguishes the alleged infringement from prior findings that training AI on legally acquired books qualifies as fair use. The plaintiffs argue that sourcing the same works from pirate libraries constitutes a separate act of copyright infringement not covered by fair use doctrine.
Governance controls
The prior class action settlement in September 2025 required Anthropic to destroy downloaded copies of pirated books and preserved authors' right to pursue individual infringement claims related to material produced by Claude models.
Classification
Sources and evidence
Sources not yet published
This record was researched and written by the Index from original reporting. Its sources are still being verified by an editor, and they are listed here once that check is complete. Until then the record carries no reviewer.