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How AI text watermarking works: a visual guide
(declaude.org)
This is a most excellent place for technology news and articles.
Yeah, they can't easily rotate keys, because the text can't tell you which key was used.
They could switch to a new key e.g. every month and then just check every previous key during detection. But that would slowly increase the likelihood of false positives, so no idea if that's a good idea either.