
Third Circuit Rules AI Training on Competitor's Legal Data Violates Copyright
The Third Circuit Court of Appeals ruled that training an AI system on a competitor's copyrighted editorial summaries constitutes infringement, not fair use. The court affirmed that Westlaw headnotes are protected works and that ROSS Intelligence’s use of them to build a rival legal research tool was minimally transformative. This marks the first federal appellate decision addressing fair use in AI training, though the full opinion remains under seal.











