Colour Printing?
According to sources, individual colour laser printers print a unique series of yellow dots on each page printed that identifies that particular printer.
Your printer upon switch on, often prints a registration page for you to post back to the manufacturer for its warranty.
It would ask you for your name, address and whether or not you are a business. (I doubt anyone would put in the "Business type" box: radical extremist).
http://www.theregister.co.uk/2005/10/20/outlaw_printer_dots/
Fun huh?
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