Subj : Re: Inkjet Printer Watermarking
To   : warmfuzzy
From : xqtr
Date : Sat May 19 2018 12:58:54

 wa> When buying a new Inkjet printer cartridge some printers leave
 wa> watermarks (or barely visible grids of dots that reveal the serial
 wa> number.  The codes that represent serial numbers can be used to trace

i think also laser printers have a similar technology. Also, photocopy 
machines, have internal hard drives, that keep backup of all documents that the
machine has printed.

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