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AI Wins Key Copyright Battle Over Book Training Data

2025-06-25Natalie Sherman and Lucy Hooker4 minutes read
AI
Copyright
Legal

A pivotal court decision has shed light on the complex intersection of artificial intelligence and copyright law. A US judge has determined that the practice of using books to train AI software does not inherently constitute a violation of US copyright law, a ruling that could have far reaching implications for the burgeoning AI industry.

In a significant development, a US judge sided with AI firm Anthropic, stating that its method of using copyrighted books to train its artificial intelligence models is permissible. The core of the judgment rests on the concept of "transformative use." Judge William Alsup, in his ruling, described Anthropic's application of the authors' books as "exceedingly transformative," thereby falling under an exception allowed by US copyright regulations. This decision marks one of the initial legal pronouncements on a critical question facing the AI sector: how Large Language Models (LLMs) can ethically and legally learn from existing copyrighted materials.

The Heart of the Case Anthropic vs Authors

The ruling emerged from a lawsuit initiated last year against Anthropic. The plaintiffs included three authors: best selling mystery thriller writer Andrea Bartz, known for novels like "We Were Never Here," and non fiction writers Charles Graeber, author of "The Good Nurse: A True Story of Medicine, Madness and Murder," and Kirk Wallace Johnson, who penned "The Feather Thief." They accused Anthropic, an AI company supported by major players like Amazon and Google's parent company, Alphabet, of effectively stealing their work to train its Claude AI model and cultivate a multi billion dollar business.

Andrea Bartz, one of the authors suing Anthropic

Transformative Use The Judges Rationale

Judge Alsup elaborated on the principle of transformative use in his decision. He suggested that Anthropic's LLMs learned from the works in a manner similar to how an aspiring writer might study existing literature. "Like any reader aspiring to be a writer, Anthropic's LLMs trained upon works, not to race ahead and replicate or supplant them — but to turn a hard corner and create something different," Judge Alsup wrote. He further stated, "If this training process reasonably required making copies within the LLM or otherwise, those copies were engaged in a transformative use." A crucial factor in this part of the ruling was that the authors did not allege that the AI training resulted in "infringing knockoffs" or direct reproductions of their books being generated for users of the Claude AI tool. The judge indicated that such a claim would have presented a different scenario.

Piracy Allegations Remain A Trial Looms

Despite the favorable ruling on transformative use, Anthropic is not entirely in the clear. Judge Alsup denied Anthropic's request to dismiss the entire case. The company must still face a trial concerning its alleged use of pirated copies of books to construct its training data library. The judge noted that Anthropic reportedly maintains a "central library" containing over seven million pirated books. Should Anthropic be found liable for copyright infringement related to these pirated materials, it could be ordered to pay damages up to $150,000 for each copyrighted work involved.

Broader Implications for the AI Industry

This ruling is among the first to directly address the legalities of training AI models on copyrighted content, a subject of numerous ongoing legal battles. The AI industry is closely watching these cases, which span various media types, including journalistic articles, music, and video. For instance, Disney and Universal recently initiated a lawsuit against AI image generator Midjourney, accusing it of piracy. Similarly, the BBC is also reportedly considering legal action over the unauthorized use of its content. In response to these legal uncertainties, some AI companies have started to pursue licensing agreements with content creators or their publishers to secure legitimate access to training materials. Judge Alsup's decision to allow Anthropic's "fair use" defense could pave the way for future legal interpretations in this rapidly evolving field.

Anthropic Responds Future Steps Unclear

In a statement, Anthropic expressed its satisfaction with the judge's acknowledgment that its use of the works was transformative. However, the company voiced disagreement with the ruling that necessitates a trial over how some of the books were acquired and used. Anthropic affirmed its confidence in its overall case and stated it is currently evaluating its next steps. A lawyer representing the authors involved in the lawsuit declined to provide a comment on the recent ruling.

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