Thomson Reuters v ROSS: What the AI Training Fair Use Ruling Means.
The Third Circuit’s opinion in Thomson Reuters Enterprise Centre GmbH; West Publishing Corp v. ROSS Intelligence Inc., 2026 WL 2932557 (3rd Cir. Sep. 29, 2026), is an important and first appellate ruling on copyright and AI training. It affirms that ROSS’s copying of Westlaw headnotes to train a competing legal-research service was not fair use. It illustrates that copying a competitor’s copyright works to develop an AI system for a service that competes with the competitor may not be fair use.…
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