Legal/press release/2026-09-29

US Appeals Court Affirms Thomson Reuters' AI Copyright Victory Against ROSS Intelligence

A U.S. appeals court has affirmed a lower court's decision, upholding Thomson Reuters' significant victory in a copyright infringement lawsuit related to artificial intelligence training. The ruling found that ROSS Intelligence, a legal research startup, infringed on Thomson Reuters' Westlaw content by using it to train its AI models. The court specifically rejected ROSS Intelligence's defense of "fair use," marking a crucial precedent for copyright holders in the evolving landscape of AI development. This landmark decision, widely reported across numerous outlets, establishes that using copyrighted material for AI training without permission can constitute infringement. While many reports focus on Thomson Reuters' win, some outlets highlight the broader implications, framing the ruling as a significant setback for AI firms that rely on large datasets, potentially impacting future AI training practices and the legal framework surrounding intellectual property in the age of generative AI.

15 articles from 14 outlets covered this story. Their coverage differs on 2 points. The underlying claim is sourced from a press release.

What do all outlets agree on?

14 outlets covered “US Appeals Court Affirms Thomson Reuters' AI Copyright Victory Against ROSS Intelligence”. All of them report the following:

  • A US appeals court upheld a lower court's decision
  • The decision favors Thomson Reuters (owner of Westlaw)
  • The case involves AI training and copyright infringement
  • The defendant was ROSS Intelligence
  • ROSS Intelligence's "fair use" defense was rejected
  • The ruling is considered a landmark or significant win

Did outlets disagree about this?

Yes. Coverage of “US Appeals Court Affirms Thomson Reuters' AI Copyright Victory Against ROSS Intelligence” differs on 2 points. Each account below is how a different outlet described the same event:

The ruling is a 'blow to AI firms' or significantly impacts the use of copyrighted works for AI training.

Music Business Worldwide, finance.biggo.com, PYMNTS.com (second article)

The ruling is primarily a pragmatic win for Thomson Reuters in a specific legal dispute.

marketscreener.com, Investing.com, Law360, wtvbam.com, Reuters, NewsBytes, PYMNTS.com (first article), Cryptopolitan, Legal IT Insider, Nieman Journalism Lab, Editor and Publisher, Life Sciences IP Review

Which outlets covered this?

All 15 articles found on this story, grouped by the stance of the piece. Every link goes to the original publisher.

What related stories are there?

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