This is just C2PA for Claude-processed files, apparently. It's not related to their text watermarking.
C2PA is file metadata and can be trivially stripped away, unlike hidden watermarks, e.g. SynthID.
The way I read it, I thought they would just check if the file hash exists on their end. Is that not the case?
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That is where their responsibility ends in terms of the EU AI Act. And that is fine and how it should be, no secret watermarks.