Bartz v. Anthropic PBC is a class action lawsuit under the Copyright Act brought by authors on behalf of copyright holders against Anthropic PBC, an AI company. The Class of copyright holders — consisting of authors and publishers – claims that Anthropic took books from pirate websites Library Genesis (“LibGen”) and Pirate Library Mirror (“PiLiMi”) without authorization.

The Court certified a LibGen & PiLiMi Pirated Books Class made up of all legal or beneficial owners of the exclusive right to reproduce any ISBN- or ASIN-bearing book that Anthropic copied from the two pirate sites. On August 26, 2025, the parties notified the Court that they had reached a settlement in principle on behalf of the Class, and will file a Settlement Agreement with the Court on September 5, 2025. Judge Alsup set a hearing on Plaintiffs’ forthcoming motion for preliminary approval on September 8, 2025, at noon in San Francisco, CA.

If you believe Anthropic may have downloaded your book(s) from LibGen or PiLiMi, please click the button below and provide your contact information.

Author and Publisher Contact Information Form

Submitting your information here does not make you a member of the Class. But, if you are a member of the class, submitting your information will help us direct formal notice of the class action at the appropriate time.  This form is not a claim form.  There are no current deadlines for Class Members to do anything in this action.  We will update this website as deadlines are set and approved by the Court.