100+ authors sue Anthropic over alleged use of pirated books

More than 100 authors filed a federal copyright lawsuit Tuesday in Northern California against Anthropic, CEO Dario Amodei and co-founder Benjamin Mann, alleging the AI company used pirated books to train its systems. The case seeks statutory damages, a jury trial and injunctive relief as Anthropic prepares for a reported IPO. Why it matters: - The lawsuit puts fresh legal risk around Anthropic’s training-data practices just as the company is preparing for a possible public offering. - Plaintiffs say the case could carry substantial financial exposure, with statutory damages sought at up to $150,000 per infringed work. - The complaint adds to a broader fight over whether AI companies can train models on copyrighted books without permission or payment. What happened: - More than 100 authors filed a federal copyright infringement lawsuit Tuesday in the U.S. District Court for the Northern District of California. - The case is Thomas William Shakespeare, et al. v. Anthropic PBC, et al., No. 3:26-cv-5931. - The suit names Anthropic PBC, co-founder and CEO Dario Amodei, and co-founder Benjamin Mann as defendants. - Plaintiffs allege infringement of nearly 500 registered copyrighted works. - Each plaintiff opted out of the proposed class settlement in Bartz v. Anthropic to pursue individual claims and a jury trial. The details: - The complaint alleges Anthropic deliberately used pirated books as training data for its artificial intelligence systems without authorization or compensation. - Plaintiffs allege Benjamin Mann downloaded at least five million books from Library Genesis using BitTorrent in June 2021. - Plaintiffs also allege Mann separately obtained the Books3 dataset, which they say was compiled from pirated sources. - The complaint says Anthropic later downloaded at least two million additional books from Pirate Library Mirror. - Plaintiffs allege Dario Amodei personally authorized and directed Anthropic’s book-acquisition strategy. - Plaintiffs further allege Anthropic’s use of BitTorrent also distributed copyrighted works to other BitTorrent users because the protocol uploads while downloading. - The plaintiffs are seeking statutory damages, injunctive relief, attorneys’ fees, costs and other relief under the Copyright Act. - The plaintiffs include authors in fiction, nonfiction, memoir, biography, young adult literature, science writing and genre fiction. - Named plaintiffs and public figures include Atari co-founder Nolan Bushnell, screenwriter Zachary Sklar, author Laura Esquivel, Newbery Medal winner Donna Barba Higuera, and bestselling novelists Brenda Hampton, Kiki Swinson, Wahida Clark and Rebecca Zanetti. - Other plaintiffs include PEN/E.O. Wilson Award winner Florence Williams, steampunk pioneer K. W. Jeter, celebrity biographer J. Randy Taraborrelli and mystery and thriller author Christopher Greyson. Between the lines: - Plaintiffs are trying to turn Anthropic’s reported IPO into leverage by raising unresolved copyright claims before investors price the company. - The complaint frames the alleged use of pirated books as a deliberate acquisition strategy, not a one-off data issue. - Anthropic has not yet responded to the lawsuit. What’s next: - The case will move through federal court in Northern California unless the parties reach a settlement or the court narrows the claims. - Plaintiffs are seeking a jury trial, which could raise the stakes on how a court views damages and liability. - Any response from Anthropic may clarify whether the company plans to contest the allegations or revisit settlement strategy. The bottom line: - This lawsuit could become another major test of how far AI companies can go in using copyrighted books to train models without permission.