Yeah I've heard that argument before, and there's no way in hell that a digital press would produce a convincing note (cracking? quality?) never mind one that would pass even the most cursory tests. There will always be some bad eggs, they will still be caught without intrusive steganography. Even then, that's not the point.
The printer was sold to you to print things. You can print what you like and it's not the government's, or the manufacturer's responsibility to trace what you print, or censor it. There is no reason to do it beyond, 'because they can' and taking a bit more freedom and privacy away from joe average.
Erherm, sorry but steganography really annoys me.
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