Federal Judge Rules for Anthropic in AI Training Lawsuit on Unauthorized Books

Federal judge William Alsup has determined that Anthropic's use of published books to train its AI models, without securing authors' permission, qualifies as legal. This ruling represents the first judicial acknowledgment of AI companies' assertion that fair use protections can shield them from liability when employing copyrighted materials to develop large language models.

This outcome deals a significant setback to authors, artists, and publishers who have initiated numerous legal actions against firms such as OpenAI, Meta, Midjourney, Google, and others. Although the ruling does not guarantee that other judges will adopt Judge Alsup's reasoning, it establishes a potential precedent favoring technology companies over creative professionals.

These legal disputes frequently hinge on judicial interpretation of fair use doctrine—a notoriously intricate exception within copyright law that has remained unrevised since 1976, predating both the internet and the very concept of generative AI training datasets.

Fair use evaluations consider the purpose of the usage (where parody and educational applications may qualify), whether the material is reproduced for commercial benefit (fan fiction may be created but not sold), and how substantially a derivative work transforms the original content.

Companies including Meta have advanced similar fair use arguments to justify training on copyrighted works, though prior to this week's decision, judicial leanings remained uncertain.

In the specific case of Bartz v. Anthropic, the plaintiff authors also challenged how Anthropic obtained and stored their literary works. The lawsuit alleged that Anthropic aimed to establish a "central library" containing "all the books in the world" for permanent retention. However, millions of these copyrighted volumes were acquired without cost from pirate websites—an unequivocally illegal practice.

While the court affirmed that Anthropic's model training constituted fair use, it will conduct a separate trial examining the nature of this "central library" collection.

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"We will conduct a trial regarding the pirated copies utilized to assemble Anthropic's central library and the corresponding damages," Judge Alsup stated in the ruling. "That Anthropic subsequently purchased legitimate copies of books it previously obtained illegally from the internet will not eliminate liability for the initial infringement, though it may influence the magnitude of statutory damages."