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Headlines · 1
- US appeals court: ROSS's use of Westlaw headnotes for AI training is not fair use
On Sept. 29, 2026, the US Court of Appeals for the Third Circuit upheld partial summary judgment in Thomson Reuters v. ROSS, holding that Westlaw's headnotes and Key Number system are original, copyrightable material and that ROSS's use of them to train its AI legal research tool was not fair use. The court found ROSS copied Westlaw's human-curated editorial layer — the problem-topic-case mapping — and produced a direct substitute for the same legal research market, while distinguishing the non-generative tool at issue from generative AI cases such as Bartz v. Anthropic and In re: OpenAI. Because ROSS has shut down, the case may not reach the Supreme Court.
虎嗅 AI · 🔥 8
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