CopyrightA US appeals court held that training AI on Westlaw headnotes is not fair use

The Third Circuit affirmed the lower court in Thomson Reuters' suit against Ross Intelligence. The court found Westlaw's headnotes copyrightable, and that Ross's use of them to train an AI tool was not fair use.

Ross's tool is not generative AI, so it is unclear whether the reasoning will carry over to generative AI cases such as the New York Times lawsuit.