"2. "Instead of a direct defense, has anyone looked at: A. figuring out where the printer gets the date/time stamps from and changing the input data, i.e. causing the time to be wrong, and B. techniques to alter the yellow dots. One way would be to run the same sheet through the printer twice, use multiple page orientations, run 1 sheet through two printers, or find a way to remove some yellow dots (the simple checksum is for error checking NOT error correction), or even add extra dots.""