Monday, December 05, 2016

All modern color printers print a secret, nearly invisible code onto every page to allow governments to track the serial number and timestamps

Printer steganography is a type of steganography – “hiding data within data” where tiny yellow dots are added to each page. The dots are barely visible and contain encoded printer serial numbers and timestamps. Unlike many forms of steganography, the hidden information is not intended to be available from a computer file, but to allow serial number and time of printing to be determined by close examination of a printout .... https://en.wikipedia.org