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flag Encyclopedia Britannica and Merriam-Webster sued OpenAI March 13, 2026, over unauthorized use of their copyrighted content to train ChatGPT.

flag Encyclopedia Britannica and Merriam-Webster have sued OpenAI, alleging it used nearly 100,000 of their copyrighted articles and entries to train ChatGPT without permission. flag They claim the AI generates near-verbatim reproductions and false citations, diverting traffic from their sites and harming their business. flag The lawsuit, filed in March 2026, alleges copyright and trademark violations, seeking damages and an injunction. flag It’s part of a growing wave of legal challenges against AI firms over training data use, with OpenAI defending its practices as fair use.

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