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Encyclopedia Britannica sues OpenAI over AI training

Encyclopaedia Britannica and Merriam-Webster accuse OpenAI of copying nearly 100,000 articles to train ChatGPT, seeking damages and an injunction for copyright and trademark infringement.

  • On Friday, Encyclopaedia Britannica and its Merriam-Webster subsidiary filed a lawsuit against OpenAI in Manhattan federal court, alleging the AI giant misused their reference materials to train its artificial intelligence models without permission.
  • The complaint alleges OpenAI used nearly 100,000 online articles for its flagship chatbot, ChatGPT, generating AI summaries that 'cannibalized' Britannica's web traffic by diverting users from the publisher's websites.
  • Beyond copyright claims, Britannica alleges OpenAI violates the Lanham Act through false hallucinations, while arguing the firm takes a 'free ride' on 'trusted' content, starving it of crucial advertising revenue.
  • An OpenAI spokesperson defended the practice on Monday, asserting that 'our models empower innovation' and are trained on publicly available data grounded in fair use standards.
  • This litigation joins a growing wave of lawsuits from news outlets and authors against tech companies, though legal precedents remain uncertain whether training large language models on copyrighted content constitutes infringement.
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British states that OpenAI used its articles and verbs to teach ChatGPT chatbot to respond to human requests and "cannibalize" the traffic of the encyclopedia on the web

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Reuters broke the news in United Kingdom on Monday, March 16, 2026.
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