Argh, hate that steganography. Can look very bad on light blue and cyan, especially gradients - makes it very green, and sometimes just shows up real bad on what's meant to be a white background.
That's besides the point, they shouldn't be adding 'features' like that. What people print with their printers is their business - how would you feel if you bought a car that tracked everywhere you went, just incase the government might need to know?
Check out
Seeing Yellow if you're interested.
