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Interesting-but rather useless IMO. There's no need for a digital watermark to be visible at all. Not simply 'nearly impossible to notice' but totally impossible to notice except by looking at the code. And if you look at the code you'll notice whatever the watermark is, as this discovery of the BREIN watermark demonstrates. The only way I can think of to not 'notice' the watermark would be for the code to look the same even though it was doing something different. Steganography-maybe that's what BREIN was trying to do & they were just rather clumsy at it.
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