Britannica and Merriam-Webster have sued OpenAI, alleging unauthorized use of nearly 100,000 copyrighted articles to train its large language model, constituting "massive copyright infringement." The lawsuit claims that OpenAI infringed copyrights by verbatim copying their content and using it in ChatGPT's retrieval workflow, while also alleging the AI violated trademark rights by fabricating information attributed to the publishers. This case further intensifies a trend of legal lawsuits filed by publishers, including The New York Times, against AI companies over training data and outputs.