How EFF cracked printers' "hidden dots" code in 2005
by Cory Doctorow from on (#2SGFC)
https://www.youtube.com/watch?v=izMGMsIZK4U
NSA whistleblower Reality Winner may have been caught thanks to a hidden pattern of dots that color printers bury in every page they print, as an assistance to law enforcement agencies. (more")