Issue No. 061 · Story 03 · October 2, 2026
CopyrightThird Circuit Rejects ROSS Copyright Fair Use Defense
The Third Circuit affirmed partial summary judgment for Thomson Reuters in its copyright case against ROSS Intelligence. The court held that 2,243 Westlaw headnotes were sufficiently original for protection and that ROSS's use of them to train a competing legal search system was not fair use.
- §ROSS used training memoranda derived from Westlaw headnotes to help its system identify judicial passages responsive to legal questions.
- §The court emphasized the competing platforms' similar purposes and the effect on the value of Westlaw's legal research service.
- §ROSS's system returned existing judicial text rather than generating new expression. The opinion addresses that record, not every use of copyrighted material in generative AI.
THE TAKEAWAY
The opinion distinguishes public judicial opinions from a publisher's protected editorial material. Its fair use analysis turns on the particular training use and competition between the two legal research platforms.
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