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Claude's Invisible Watermark Is Here: What It Can and Cannot Prove

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

Claude now leaves a machine-detectable statistical pattern in supported text and attaches signed provenance metadata to supported files. The change is global, survives copy and paste, and is driven by the EU AI Act. But it is not a perfect AI detector, a user-tracking system, or proof that Claude a…

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  1. 2026-09-20 07:50 · DEV Community — AI
    Claude's Invisible Watermark Is Here: What It Can and Cannot Prove

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