Britannica has filed a lawsuit against OpenAI, accusing the company of repeatedly copying articles from the encyclopedia without permission, reproducing them almost word for word in the responses provided to users. Britannica's lawyers presented the court with evidence that includes materials from the encyclopedia and the versions reproduced by OpenAI's models. Britannica claims that this practice has affected its traffic and turned OpenAI into a direct competitor, using stolen content. The lawsuit is not surprising, considering that many large tech companies have used materials available on the internet to train their artificial intelligence models. In the past, Britannica has filed a similar lawsuit against Perplexity.