Or more accurately, your color laser printer may be printing an almost-invisible serial number on every printout that it makes. According to this PCWORLD.COM article that’s reprinted on Yahoo news, Xerox and several other laserprinter manufacturers have quietly rigged their machines to print a serial-number in yellow dots on every square inch of every printout that they make. It’s nearly invisible unless you know what to look for. But if you know, it shows right up.
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