Microsoft Tells Court Copilot Rarely Reproduces Books in AI Copyright MDL

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Microsoft moved for summary judgment on September 4, 2026 in the consolidated copyright litigation brought by book authors and news publishers over the training of large language models, telling a federal court in Manhattan that an expert's review of 8.2 million Copilot conversations found only 24 responses containing at least 30 words matching the authors' asserted works. The figure comes from an analysis described in Microsoft's memorandum of law supporting its summary judgment motion in the…