Did you know that your colour laser printer is secretly printing a forensic code on every one of your printouts so the government can track it?
Sounds like a nutjob conspiracy theory, but it’s true!
Yellow dots that are invisible to the naked eye are printed all over your page that have the printer serial number and time and date encoded within them.
List of printers that do/don’t have this forensic encoding
It may even violate human rights
from EEVblog – The Electronics Engineering Video Blog http://www.eevblog.com/2015/12/02/eevblog-825-your-printer-is-spying-on-you/