Secret documents Tracking Yellow Printer Dots + Tracking Dot Decoding Guide
source: http://www.makeahistory.com/index.php/free-stuff/27423-secret-dockuments-tracking-yellow-pri...
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Most color laser printers made and sold today intentionally add invisible information to make it easier to determine where (and when) a particular document was printed. This seems to have been done as part of a secret deal between the United States Secret Service and the individual manufacturers. Some of the manufacturers have mentioned the existence of the tracking information in their documentation, and others haven't. None of them have explained exactly how it works or what information is conveyed. No law requires printer companies to help track printer users this way, and no law prevents them from stopping this practice or giving customers a solution to avoid being tracked. + interactive decoding computer program http://www.makeahistory.com/index.php/free-stuff/27423-secret-dockuments-trackin...
