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Britannica sues OpenAI, says ChatGPT copied its encyclopedia
The lawsuit was filed in Manhattan federal court

Britannica sues OpenAI, says ChatGPT copied its encyclopedia

Mar 17, 2026
11:07 am

What's the story

Encyclopedia Britannica and its dictionary arm Merriam-Webster have sued OpenAI, alleging that the tech giant used their copyrighted material to train its artificial intelligence models. The lawsuit was filed in a Manhattan federal court on Friday. Britannica claims that OpenAI misappropriated its online articles, encyclopedic entries and dictionary definitions for training purposes without permission.

Traffic impact

Britannica accuses OpenAI of 'cannibalizing' its web traffic

The lawsuit also accuses OpenAI of "cannibalizing" Britannica's web traffic with AI-generated summaries of its content. This, Britannica argues, diverts users from visiting its websites. The case is one among many high-profile lawsuits by copyright owners against tech companies for using their material to train AI systems without permission.

Ongoing litigation

Britannica previously sued AI startup Perplexity AI

Notably, this isn't the first time Britannica has taken legal action over content misuse. The company had filed a similar lawsuit against AI start-up Perplexity AI last year, which is still pending. Meanwhile, OpenAI has yet to comment on these latest allegations from Britannica and Merriam-Webster.

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Content misuse

Lawsuit claims ChatGPT generates 'near-verbatim' copies of content

The lawsuit details how OpenAI allegedly used nearly 100,000 of Britannica's articles to train its GPT large language models. It also claims that ChatGPT generates "near-verbatim" copies of Britannica's encyclopedia entries, dictionary definitions and other content. This practice, Britannica argues, diverts users who would otherwise visit its websites.

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Trademark violation

Britannica also alleges trademark infringement by OpenAI

Along with content misuse, Britannica has also accused OpenAI of trademark infringement. The company alleges that OpenAI has implied it has permission to reproduce its material and wrongfully cited Britannica in false AI "hallucinations." In light of these allegations, Britannica is seeking an unspecified amount of monetary damages and a court order to block the alleged infringement by OpenAI.

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