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United States · US-024

Encyclopaedia Britannica and Merriam-Webster v OpenAI

ALLEGEDU.S. District Court for the Southern District of New York1:26-cv-02097Pending - OpenAI MDL-related
TrainingMemorisationOutputsSubstantial SimilarityMarket Harm / Substitution

Key holding or allegation

Complaint allegations only; no merits ruling identified by the cutoff.

Why it matters

High-profile reference-publisher litigation integrated with the broader OpenAI copyright proceedings.

Facts

Britannica and Merriam-Webster allege unauthorised training uses, memorisation and reproduced/summarised protected content in outputs.

Issues before the court

Core copyright claims remain unresolved.

What the court did not decide

All merits questions.

Procedural timeline

2026-03-13

U.S. District Court for the Southern District of New York
Complaint filed: Britannica and Merriam-Webster allege unauthorised OpenAI training, memorisation and substantially similar/reproducing outputs.

ALLEGED