When buying a new Inkjet printer cartridge some printers leave
watermarks (or barely visible grids of dots that reveal the serial
number. The codes that represent serial numbers can be used to trace
i think also laser printers have a similar technology. Also, photocopy machines, have internal hard drives, that keep backup of all documents that the machine has printed.
...of course, these types of backdoors at the hardware level are near impossible to get around. I know I certainly cannot make my own
Intel/AMD CPU replacements :D
When buying a new Inkjet printer cartridge some printers leave watermarks (or barely visible grids of dots that reveal the serial number.
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