blue light used to decode secret dots on color printers
http://www.eff.org/Privacy/printers/docucolor/
Hidden codes cracked
http://yro.slashdot.org/yro/05/10/18/1210237.shtml?tid=158&tid=194
http://www.eff.org/Privacy/printers/docucolor/
Hidden codes cracked
http://yro.slashdot.org/yro/05/10/18/1210237.shtml?tid=158&tid=194