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Your digital camera may embed metadata into photographs with the camera's serial number or your location. Your printer may be incorporating a secret code on every page it prints which could be used to identify the printer and potentially the person who used it. If Apple puts a particularly creepy patent it has recently applied for into use, you can look forward to a day when your iPhone may record your voice, take a picture of your location, record your heartbeat, and send that information back to the mothership.
This is traitorware: devices that act behind your back to betray your privacy.
It's apparently laser printers, specifically color laser printers, ostensibly to be used to identify the source of counterfeit currency, but which can have nefarious uses also.
Originally posted by bozzchem
I have been familiar with the printer issues for quite some time. Never use your printer to send a letter you don't wish to be traced back to you. That's old school.