Over 100 authors sue Anthropic for $75M over alleged copyright theft

More than 100 authors have filed a lawsuit against Anthropic seeking over $75 million in damages, alleging the AI company behind Claude pirated their copyrighted books to train its models. The case, filed in mid-June 2026 in the US District Court for the Northern District of California, represents a new legal front that focuses not on whether AI training constitutes fair use, but on how the training data was obtained in the first place.

The lawsuit, titled Shakespeare v. Anthropic, is led by British sociologist Thomas William Shakespeare. The plaintiffs allege that Anthropic downloaded their works from sources like LibGen and BitTorrent, essentially shadow libraries and peer-to-peer piracy networks, to build the datasets powering Claude.

From fair use to outright piracy

This lawsuit sidesteps the fair use debate entirely. The plaintiffs aren’t arguing about what Anthropic did with their books after ingesting them. They’re arguing that Anthropic obtained the books through illegal channels. A company can potentially defend AI training under fair use. Defending the acquisition of training materials through piracy networks is a much harder sell in court.

The plaintiffs in this case are primarily authors who opted out of a previous settlement in the Bartz v. Anthropic case. That earlier action resulted in a proposed $1.5 billion settlement covering approximately 480,000 works, with preliminary approval granted in 2025. Authors who stayed in that settlement stood to receive roughly $3,000 to $3,100 per work after legal fees, and claims were filed for over 90% of eligible works.

The broader AI copyright reckoning

Anthropic is far from the only AI company facing copyright heat. Music publishers, visual artists, and news organizations have all filed suits against various AI firms.

The trajectory from Bartz to Shakespeare also suggests that Anthropic’s legal exposure is compounding rather than resolving. Settling one case for $1.5 billion only to face another for $75 million from authors who thought the first settlement was insufficient indicates a pattern that investors and partners will be watching closely.

What this means for AI investors and the tech landscape

Anthropic, which has raised billions in funding and counts Amazon as a major backer, faces reputational risk alongside the direct financial exposure. The case also raises questions about the valuation assumptions underpinning the current AI investment boom. Legally licensed training data is more expensive, more limited, and harder to scale than indiscriminately scraped datasets.

Investors should watch how the court handles the piracy allegations specifically. If the judge allows those claims to proceed separately from the fair use question, it could create a template for a new wave of litigation that’s much harder for AI companies to defend against.

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