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Court rulingJuly 17, 2025Bartz v. Anthropic PBC · N.D. Cal. 3:24-cv-05417

Judge certifies a class of owners of books Anthropic downloaded from LibGen and the Pirate Library Mirror, and orders Anthropic to list them

Judge Alsup certified a class limited to owners of the reproduction right in books that carry an ISBN or ASIN, were registered with the Copyright Office in time, and were downloaded by Anthropic from LibGen or the Pirate Library Mirror. He declined to certify classes for Books3 or for the print books Anthropic scanned. The order states that Anthropic's co-founder used BitTorrent in June 2021 to copy LibGen and that the Pirate Library Mirror was torrented in July 2022, and that Anthropic also downloaded those libraries' catalogs, which identify each file by ISBN and by a hash. On that basis the judge found class members could be identified, and ordered Anthropic to produce, by August 1, 2025, title, author, publisher and identifier data for the files, with the plaintiffs to submit a class list by September 1. Works left off the final list are outside the class. The settlement's works list, 482,460 works, grew out of this process.

Order on class certification (Dkt. 244) ↗

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Every item says what kind of source it rests on. A court ruling or order is the court's own statement. A company filing is what a defendant says about itself. A government filing is a statement by a government agency that is not a party to the case, such as a statement of interest; it is the government's position, not a ruling. An allegation is what a complaint or motion claims and has not been decided. Reported means press reporting we have not confirmed from the primary document. Summaries are our own; follow the links for the source.

This page is general information, not legal advice. An allegation is not a finding. Whether any of this matters for a particular work or claim is a question for a lawyer.