Subj : Inkjet Printer Watermarking
To   : All
From : warmfuzzy
Date : Sat May 19 2018 02:30:02

When buying a new Inkjet printer cartridge some printers leave watermarks (or
barely visible grids of dots that reveal the serial number.  The codes that
represent serial numbers can be used to trace back where a printed photograph
comes from.  This can be used to localize perverted photography producers and
those who are testing out the copying of paper money.  So, though I neither
produce illegal porn or copy dollar bills, I make a point of not registering my
printer for that $20 refund.  If I want to produce a counter-cultural zine or
something like that the government has no business in tracking down activist
flyers, letters to the editor, or other such legal though controversial printed
media.  The dots become more visible when using a lot of ink, printing in the
"photo" setting.  This technology has been reported by the Electronic Frontier
Foundation (www.eff.org) several years back.

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