The Electronic Frontier Foundation has just released a report proving that a lot of toady's printers can give information about users without their knowledge. Printers from Xerox and HP among others print tiny yellow dots which are generally not visible to the naked eye. The embedded code is supposedly for use by the US Secret Service as a tool to track counterfeiters.

News Sources:
CNN/Money - Color printer as people finder?
ZDNET - Images: EFF cracks printer tracking code
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