An image of one repetion of the dot grid from the Xerox DocuColor 12 page, magnified 10x and photographed by the QX5 microscope under illumination from a Photon blue LED flashlight
Image Source: w2.eff.org

An image of one repetion of the dot grid from the Xerox DocuColor 12 page, magnified 10x and photographed by the QX5 microscope under illumination from a Photon blue LED flashlight

The dot grid under 60x magnification
Image Source: w2.eff.org

The dot grid under 60x magnification

Detail map of San Francisco, California, United States Overview map of San Francisco, California, United States

A: San Francisco, California, United States

Decoding Printer Tracking Dots

10/19/2005
The Electronic Frontier Foundation logo
Image Source: origin.playstationlifestyle.net

The Electronic Frontier Foundation logo

In October 2005 the Electronic Frontier Foundation decoded printer tracking dots.

Timeline Themes

Codes / Cryptography / Cryptanalysis
Freedom / Privacy / Security / Surveillance
Printing by Machine