On February 11, 2025, Judge Stephanos Bibas issued an opinion in Thomson Reuters Enterprise Centre GMBH v. Ross Intelligence Inc., civ. no. 1:20-cv-613, a dispute regarding copyright infringement allegations stemming from the use of copyrighted data from the Westlaw legal database used in the training of an AI search tool. Judge Bibas, sitting by designation in this matter from the Third Circuit, granted partial summary judgment to Thomson Reuters on direct copyright infringement and determined that Thomson Reuters’ Westlaw key number system and more than 2,200 headnotes were impermissibly used to create Ross’s competing product and are original enough to be protected by copyright.
After finding that the Westlaw system was copyrightable, Judge Bibas rejected Ross’s fair-use defense. In the highly anticipated opinion, Judge Bibas found that two key factors of the “four factor fair use analysis” favored Thomson Reuters. Specifically, the purpose of Ross’s use of headnotes from Thomson Reuters’ Westlaw legal research service and its harm to the market for the originals both favor Thomson Reuters. Therefore, Ross’s fair use defense failed, and using Westlaw’s copyrighted headnotes to train Ross’s AI search tool was found to be copyright infringement.Continue Reading Judge Rejects Fair Use Defense in Thomson Reuters’ AI Copyright Suit Against Ross Intelligence