One of the most closely watched AI-adjacent copyright disputes in legal tech is moving deeper into the appellate phase. Thomson Reuters and Ross Intelligence are now before the Third Circuit in Thomson Reuters Enterprise Centre GmbH, et al v. Ross Intelligence Inc, a case that has become a bellwether for how courts may treat the use of proprietary legal content in building competing research tools.

The dispute stems from allegations that Ross used Thomson Reuters’ Westlaw headnotes and related editorial material to train or develop its legal research platform without authorization.