Nearly 400 newspaper publishers have sued Microsoft (NASDAQ:MSFT) and OpenAI, alleging the companies unlawfully copied and used their copyrighted articles to train the large language models behind their AI products without permission or compensation.

The lawsuit, filed in the U.S. District Court for the Southern District of New York, claims the practice violates federal copyright law. Benzinga contacted Microsoft and OpenAI for comment but did not receive a response by the time of publication.

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