The Electronic Frontier Foundation (EFF), a consumer privacy group, disclosed this week that it has cracked a tracking code found in a popular line of Xerox printers, NewsFactor reports.

“The miniscule yellow dots have been secretly embedded in every document printed by several lines of color laser printers and were designed to allow the U.S. government to trace copies,” NewsFactor says. “The dots, less than a millimeter in diameter and repeated over each page of a document, are only visible under blue light with a magnifying glass or microscope.”

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