Magazine giant Condé Nast has sent a cease-and-desist letter to artificial intelligence search engine Perplexity, demanding that it stop using content from Condé Nast publications in its search results, according to a copy of the letter obtained by The Information. Condé Nast’s publications include The New Yorker, Vogue and Wired.

The legal demand from Condé Nast comes a month after Forbes sent a similar letter to Perplexity, accusing it of infringing Forbes’ copyright. In Condé Nast’s letter, sent on Monday, the publisher accused Perplexity of plagiarizing its content. The challenge adds to a growing tide of legal actions facing AI startups over their use of news outlets’ content for training their large-language models.