Claude Now Signs Everything It Writes. Anthropic Is Watermarking AI Text, and the EU Made It Global.

Anthropic has begun embedding invisible, machine-readable watermarks in text from new Claude models and attaching C2PA provenance to the files it makes. There is no opt-out, and it applies worldwide, because Europe's AI Act set the rule. What it proves, what it misses, and why content provenance is quietly becoming infrastructure.