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AnthropicPolicyMateriality 2

Anthropic watermarks all Claude outputs globally

Anthropic will embed invisible watermarks in all Claude-generated text and sign files using the C2PA standard. New models from August 2026 will have labeling built in, and detection tools are planned for third-party verification.

First seen 11 Aug, 08:45 UTC on The Decoder4 sourcesLast update 64d ago

What the sources say

Linked, never rewritten. Official means the lab itself.

Official0

No word from Anthropic yet.

Press3

The Decoder· 11 Aug, 08:45Anthropic watermarks all Claude outputs globally with marks that "may persist through some editing"SiliconANGLE· 11 Aug, 20:39Anthropic to start watermarking Claude-generated text, imagesThe Decoder· 17 Aug, 11:43Anthropic watermarks Claude's output, but critics question the tradeoffs

Community1

Hacker News· 16 Aug, 21:53Anthropic's 'watermark' text adulteration in Claude is a perversion of writing825 points · 731 comments

How it unfolded

Every source in the order it appeared. Times in UTC.

11 Aug 08:45The Decoder Anthropic watermarks all Claude outputs globally with marks that "may persist through some editing"11 Aug 20:39SiliconANGLE Anthropic to start watermarking Claude-generated text, images16 Aug 21:53Hacker News Anthropic's 'watermark' text adulteration in Claude is a perversion of writing17 Aug 11:43The Decoder Anthropic watermarks Claude's output, but critics question the tradeoffs

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