Copy-resistant document

Details Copy-resistant document Copy-resistant document

G - Physics

03

G

G03G 21/04 (2006.01)

Patent

CA 2148747

A document that resists copying by ordinary color copiers and color scanners. An area that is printed with color dots using a gradient print screen that exceeds resolutions available on commonly available color copiers and color scan- ners. The area may therefore comprise lighter regions (having fewer screen lines per inch) and darker regions (having more screen lines per inch). Multiple colors may be printed with different gradient print screens, and regions which are darker or lighter for a first color may or may not be darker or lighter for a second color. The document may also comprise a second area that is printed with a moiré pattern. The moiré pattern may be generated by adjusting an angle between a pair of print screens, such as a pair of gradient print screens. A set of colors for printing may avoid common printing ink colors, may prefer yellow, light green, or light blue, and may avoid red, purple, or violet, to raise the difficulty in copying by color copiers or color scanners. A top layer of the area may be cov- ered with a layer of matte varnish or transparent white ink.

Affiliated with

Also associated with

Rating

Copy-resistant document does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Copy-resistant document, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Copy-resistant document will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1810345