Comment Comment by monopolemagnet This has been known for over a decade.http://seeingyellow.com/https://en.wikipedia.org/wiki/Printer_steganographyAnything printed on most (but not all) color printer can be traced back to the printer on which it was printed (serial number) and often date stamp as well.https://www.eff.org/pages/list-printers-which-do-or-do-not-d...Furthermore, most image editing programs and many scanners and copiers often refuse to capture currency because of microprinted circles.https://freedom-to-tinker.com/blog/felten/photoshop-and-curr...http://www.cl.cam.ac.uk/~mgk25/eurion.pdfhttp://www.rulesforuse.org/pub/index.php?lang=en(note: official US currency images have link-rotted away) parent monopolemagnet 11 years ago
http://seeingyellow.com/
https://en.wikipedia.org/wiki/Printer_steganography
Anything printed on most (but not all) color printer can be traced back to the printer on which it was printed (serial number) and often date stamp as well.
https://www.eff.org/pages/list-printers-which-do-or-do-not-d...
Furthermore, most image editing programs and many scanners and copiers often refuse to capture currency because of microprinted circles.
https://freedom-to-tinker.com/blog/felten/photoshop-and-curr...
http://www.cl.cam.ac.uk/~mgk25/eurion.pdf
http://www.rulesforuse.org/pub/index.php?lang=en
(note: official US currency images have link-rotted away)