Thomson Reuters, a veteran legal publisher, owns copyrights in its Westlaw platform, which includes editorial materials such as headnotes. These headnotes are concise summaries of legal points from judicial opinions, crafted by editors following specific guidelines to ensure clarity, independence from the opinion, and informative content. ROSS Intelligence, a startup aiming to compete with Westlaw, enlisted a third party to create AI training memos for its legal search engine. In doing so, the memos’ creators copied thousands of Westlaw headnotes to frame legal questions, using them to train ROSS’s AI to match legal questions with relevant opinion passages.

Thomson Reuters sued ROSS in the United States District Court for the District of Delaware, alleging copyright infringement and tortious interference. The District Court granted partial summary judgment for Thomson Reuters, holding that the 2,243 Westlaw headnotes at issue were original enough for copyright protection and that ROSS’s copying of these headnotes did not constitute fair use. The court found that the memo questions were so similar to the headnote text and so dissimilar from the underlying opinions that no reasonable juror could conclude the headnotes were not copied.

The United States Court of Appeals for the Third Circuit reviewed the District Court’s summary judgment order. The Third Circuit affirmed the District Court, holding that Thomson Reuters’s editorial headnotes possess the requisite originality for copyright protection. It further held that ROSS’s copying and use of the headnotes to train an AI legal search platform was not fair use, given the highly commercial nature of ROSS’s use, its minimal transformative purpose, the substantial copying involved, and the harm to both the value and potential markets for Thomson Reuters’s work. View “Thomson Reuters Enterprise Centre GmbH v. Ross Intelligence Inc.” on Justia Law