India, Aug. 12 -- Anthropic confirmed this week that it has started embedding invisible, machine-readable watermarks into everything its Claude AI models generate, a global rollout triggered by new transparency rules under the European Union's AI Act. The change reaches users everywhere: on the web, the mobile app, coding tools and cloud platforms, regardless of whether the EU rules apply to them directly.

The shift raises an obvious question: what does a watermark actually prove, and what happens once AI text is edited or blended with a person's own writing?

The short answer is that a watermark only signals that content passed through Claude. It is not confirmation that AI wrote every word.

Think of it as a hidden signature. Anthropic...