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Deeplinks Blog by Seth Schoen | June 6, 2017

Several journalists and experts have recently focused on the fact that a scanned document published by The Intercept contained tiny yellow dots produced by a Xerox DocuColor printer. Those dots allow the document's origin and date of printing to be ascertained, which could have played a role in...

Deeplinks Blog by Mark Rumold | March 16, 2011

This week marks the seventh annual Sunshine Week, a national initiative to promote dialogue about the importance of open government and freedom of information. As our little way to celebrate, EFF has recently posted nearly nine thousand pages of government documents to our site. For the majority of these...

Deeplinks Blog by Seth Schoen | January 23, 2009

In a recent review of the HP Color LaserJET CM3530 printer, the magazine Government Computer News called out the use of tracking codes -- which GCN referred to as "a secret spy program" -- as the biggest problem with that printer. GCN found that the yellow dots produced by...

Deeplinks Blog by Richard Esguerra | October 24, 2008

Since late 2004, EFF has been warning the public about "printer dots" -- tiny yellow dots that appear on documents produced by many color laser printers and copiers. These yellow dots form a coded pattern on every page the printer produces and can be used to identify specific details about...

Deeplinks Blog by Danny O'Brien | February 13, 2008

We've long been concerned about the human rights risks of printer tracking dots for anyone who publishes printed works with modern technology. Tracking dots are the secret marks that many popular color laser printers and photocopiers scatter across every document they touch. The marks, almost invisible to the eye,...