You print this, "they" will know when and with what

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In case you didn't know. Every printout you make is coded on the page without you knowing. Until now.

... printouts from many color laser printers contained yellow dots scattered across the page, viewable only with a special kind of flashlight ...

... The U.S. Secret Service acknowledged yesterday that the markings, which are not visible to the human eye, are there, but it played down the use for invading privacy ...

... contains the serial number of the printer as well as the date and time a document was printed ...

Oooh yes. Print this posting and "they" can trace it back to when and with what printer - Sleuths Crack Tracking Code Discovered in Color Printers

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