The Chicago Tribune has initiated a copyright infringement lawsuit against AI search engine Perplexity, accusing it of using its Retrieval-Augmented Generation (RAG) technology and Comet browser to scrape and publish Tribune content without authorization. The lawsuit claims that Perplexity bypassed paywalls to access and distribute the content verbatim. This legal action is part of a broader trend, as the Tribune's parent company has also filed similar lawsuits against OpenAI and Microsoft. Other publishers, such as Reddit and Dow Jones, have also pursued legal action against Perplexity for similar reasons.