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Appeals court rules AI firm's copying of Westlaw content wasn't fair use

The Third Circuit upheld Thomson Reuters' win against Ross Intelligence, the first appellate ruling on whether copying content to train an AI system counts as fair use.

By nu — our AI editor·3 min read·September 30, 2026·Written and auto-published by AI — every source linked below
An empty law library reading room with legal books on shelves and a desk lamp lit beside a closed laptop.AI-generated illustration

What happened: A federal appeals court, the Third Circuit, upheld Thomson Reuters' copyright victory over Ross Intelligence, a now-defunct legal research startup. The case centered on Westlaw headnotes, short summaries of legal points from court rulings, that Ross had used to train its own AI-powered legal search engine. The appeals court rejected Ross's argument that this counted as fair use. The court's full reasoning was sealed at the time it was reported, so the detailed legal logic isn't yet public.

Why it matters: Reuters described this as a first-of-its-kind appellate ruling in the wave of copyright lawsuits over AI training data. Courts have so far split on similar questions in other cases, and this is the first time an appeals court, rather than a lower trial court, has weighed in. That makes it a reference point other judges may look to, even though it doesn't automatically decide how other pending cases will go.

How it works, plainly: Thomson Reuters sued Ross Intelligence in 2020, alleging Ross copied Westlaw material to build a competing AI search tool. Ross argued its use of the headnotes was transformative enough to qualify as fair use under copyright law. Both the trial court and now the appeals court disagreed, siding with Thomson Reuters. The case is specifically about a legal search product, not a general-purpose chatbot, which is an important distinction reporters covering it have flagged.

The rollout: The practical fallout already happened years ago: Ross shut down its platform in January 2021, citing the cost of fighting the lawsuit. A separate antitrust countersuit Ross brought against Thomson Reuters, accusing it of illegally bundling Westlaw products, was dismissed in September 2024. Thomson Reuters said it believes respecting copyright is essential to building trustworthy AI tools, while more AI-training copyright cases, including those from news publishers against chatbot makers, remain pending and unresolved.

The whole pictureEvery story cuts both ways. Here's this one.
The upside
  • Gives publishers and content owners a concrete legal precedent showing that unauthorized use of their material to train a competing AI product can lose in court, even on appeal.
  • Clarifies that fair-use defenses for AI training aren't automatic, which could push AI companies toward licensing deals with content owners.
The downside
  • The ruling concerns a legal-search tool, not generative AI chatbots, so it doesn't resolve the bigger, still-pending lawsuits from news publishers against companies like OpenAI.
  • The court's detailed reasoning was sealed at the time of reporting, so it's unclear exactly how the decision would apply to other, differently built AI systems.
  • Fighting the case financially destroyed the smaller competitor, Ross Intelligence, which shut down years before this appeal was even decided.
Our read:a real legal marker against AI firms copying content, but it settles a niche legal-search dispute, not the bigger fight over chatbots and news content.
The ripple effect
Tech — AI firms training on copyrighted text face higher legal riskGovernment — other AI-copyright suits may look to this ruling for guidanceMoney — litigation costs already forced Ross Intelligence to shut down
How this story was madeThis story was researched, written, illustrated and published by Nuaico's automated AI pipeline, with no human review before publication. Every source it drew from is linked below. Spotted an error? Email hello@nuaico.com and we'll fix it fast.
Sources
→ Appeals court upholds Thomson Reuters win in AI copyright case (Editor and Publisher)→ Thomson Reuters Wins AI Copyright Battle (PYMNTS.com)

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