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Anthropic Puts Hidden Watermarks on Claude Text Under New EU Rules

Anthropic embeds invisible watermarks in Claude text worldwide to meet EU transparency rules, with marks designed to survive copy-paste and some edits.

  • Anthropic implemented machine-readable watermarks for New Claude models to tag AI-generated content worldwide, ensuring transparency across products like Claude Code and Claude Cowork.
  • The initiative aligns with the European Union Code of Practice and transparency requirements under the Act, which Anthropic signed to standardize AI-generated content tracking.
  • Anthropic utilizes invisible signals for Text, while Files carry signed provenance metadata based on the C2PA standard to record Content Provenance and Authenticity.
  • Platforms including AWS, Google Cloud, and Microsoft Foundry now incorporate these markings, providing a machine-readable identity that helps third parties detect Claude-generated material.
  • Detection reliability remains limited for both Text and Files, as Anthropic cautions that editing or Short passages can compromise the signals and undermine definitive authorship proof.
Insights by Ground AI

31 Articles

Lean Left

"The meaning, quality and legibility of the response is not seen and does not change," says the company, which has not yet explained how it will be possible to verify whether a particular text carries that 'generated with AI' signal.

·Madrid, Spain
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Lean Left

The vast majority of Canadian authors will not receive compensation from Anthropic, who used their books to train Claude.

·Montreal, Canada
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India Today broke the news in Noida, India on Monday, August 10, 2026.
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