>The watermarking algorithm itself has a VERY specific property that should have set off everyone's alarm bells: it is NOT the case that you can "check text for AI watermark". What it technically mandates is that if you provide access to a model, those people should be able to check if text is generated by that model. Not by any other model. It is NOT a general "is this AI?"

Where do I find that in the Act (or code of practice etc.)? IANAL, but Article 50 reads different to me but if there is a comment or guide how to read it - also fair enough.