Thomson Reuters has won an early battle in court over the question of fair use in artificial intelligence-related copyright cases. The media and technology company filed a lawsuit against Ross Intelligence — a now-defunct legal research firm — in 2020, arguing they had used materials from Thomson Reuters’ own legal platform Westlaw to train an AI model without permission. Judge Stephanos Bibas of the 3rd U.S. Circuit Court of Appeals issued a decision Tuesday that affirmed Ross Intelligence was not permitted under U.S. copyright law to use the company’s content in order to build a competing platform.