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Somewhat trivially, if I ask Claude to transcribe an image and then check if that transcription is ai generated it will likely say yes.

Many users are not smart enough to realize that the transcription step is where the ai (watermarks) were necessarily injected.

How is a perfect transcription of an image watermarked?

"Perfect as far as human perception can tell" is a weaker standard than "bit-to-bit copy." Maybe it's that?

It depends on how it does watermarking!!

Note, there are many ways to represent words visually on computers that look identical

If they were substituting glyphs for identical ones people would be able to reverse engineer it.

Theres no way that’s what they are doing.