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Encyclopedia Britannica sues OpenAI over AI training

Published by Global Banking & Finance Review

Posted on March 16, 2026

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· Last updated: April 1, 2026

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Encyclopedia Britannica sues OpenAI over AI training
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By Blake Brittain March 16 (Reuters) - Encyclopedia Britannica and its Merriam-Webster subsidiary have sued OpenAI in Manhattan federal court for allegedly misusing their reference materials to train

Encyclopedia Britannica sues OpenAI over AI training

By Blake Brittain

Britannica accuses OpenAI of copyright infringement in AI model training

March 16 (Reuters) - Encyclopedia Britannica and its Merriam-Webster subsidiary have sued OpenAI in Manhattan federal court for allegedly misusing their reference materials to train its artificial intelligence models.

Details of the lawsuit

Britannica said in the complaint filed on Friday that Microsoft-backed OpenAI used its online articles and encyclopedia and dictionary entries to teach its flagship chatbot ChatGPT to respond to human prompts and "cannibalized" Britannica's web traffic with AI-generated summaries of its content.

OpenAI's response

"Our models empower innovation, and are trained on publicly available data and grounded in fair use," an OpenAI spokesperson said on Monday in response to the lawsuit.

Britannica's response

Spokespeople and attorneys for Britannica did not immediately respond to a request for comment on Monday.

Context: AI lawsuits and copyright concerns

The case is one of many high-stakes lawsuits filed by copyright owners including authors and news outlets against tech companies for using their material to train AI systems without permission. Britannica filed a related lawsuit against artificial intelligence startup Perplexity AI last year that is still ongoing.

Fair use arguments by AI companies

AI companies have argued that their systems make fair use of copyrighted content by transforming it into something new.

Allegations and demands by Britannica

Britannica's lawsuit said that OpenAI unlawfully copied nearly 100,000 of its articles to train GPT large language models. The complaint said that ChatGPT produces "near-verbatim" copies of Britannica's encyclopedia entries, dictionary definitions and other content, diverting users who would otherwise visit its websites.

Trademark infringement claims

Britannica also accused OpenAI of infringing its trademarks by implying that it has permission to reproduce its material and wrongfully citing Britannica in false AI "hallucinations."

Requested remedies

Britannica requested an unspecified amount of monetary damages and a court order blocking the alleged infringement.

(Reporting by Blake Brittain in Washington; Editing by Kirsten Donovan and Chizu Nomiyama)

Key Takeaways

  • Britannica claims OpenAI used its content without permission to train language models, allegedly copying nearly 100,000 entries and diverting user traffic with AI‑generated summaries (axios.com)
  • The lawsuit also alleges trademark infringement by implying permission and wrongly attributing AI hallucinations to Britannica or Merriam‑Webster (axios.com)
  • This suit adds to a growing wave of litigation by publishers and authors—including previous actions by Britannica against Perplexity AI, and similar lawsuits by news outlets and authors—challenging AI training methods and seeking damages and injunctions (axios.com)

References

Frequently Asked Questions

Why did Encyclopedia Britannica sue OpenAI?
Encyclopedia Britannica sued OpenAI for allegedly misusing its reference materials to train AI models without permission, which it claims resulted in lost web traffic.
What does Britannica allege OpenAI did with its content?
Britannica alleges that OpenAI unlawfully copied nearly 100,000 articles to train its large language models, and that ChatGPT produced near-verbatim copies of its entries.
Who else is mentioned in the lawsuit besides Britannica and OpenAI?
Merriam-Webster, a subsidiary of Britannica, is also a plaintiff. The lawsuit mentions Microsoft as OpenAI's backer and references a related case against Perplexity AI.
What does Britannica seek from the lawsuit against OpenAI?
Britannica requests monetary damages and a court order to block OpenAI's alleged copyright infringement.

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