Just about every printer on the planet leaves a digital footprint – tiny,
almost invisible yellow dots on every page they print, featuring
information such as the printer’s serial number and a timestamp. To pick up
the dots, you’d need a microscope and a blue light.

The information is there for the exact reason you would expect, to make
pages traceable. It’s a practice known as digital steganography, which *IEEE
Xplore* define as “the art of inconspicuously hiding data within data”.
http://bit.ly/1Jaw0Wz
http://bit.ly/1Jaw0Wz+

-- 
Peterk
Dallas, Tx
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"The problems of our economy have occurred not as an outgrowth of
laissez-faire, unbridled competition.
They have occurred under the guidance of federal agencies, and under the
umbrella of federal regulations."
Senator Ted Kennedy, in defending trucking deregulation in 1978.

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