「AI生成的内容全部加水印」OpenAI、Anthropic、Google都签了

TL;DR - Major AI companies signed the EU’s AI-generated content transparency code, committing to machine-readable labeling and detection across text, images, audio, and video. Anthropic is implementing invisible text watermarks and signed provenance metadata across Claude models and access channels.

• New Claude models launched in the EU will embed detectable text watermarks at the model level, with older models expected to follow by December 2.
• Claude-generated SVG, PNG, and JPG files will carry digitally signed C2PA provenance metadata that can also indicate later tampering.
• Google’s existing SynthID Text alters token probabilities to create statistical signals that can survive minor edits but weaken after extensive rewriting or translation.
• Watermarks are imperfect evidence: mixed or heavily edited content may evade detection, while a detected signal does not conclusively prove authorship.