Redundant Data
Multiple occurrences of the same image or information on a document to complicate alterations. Further repetition of the same information can lead to data errors.
Serial Numbering and Marking
A unique number (either numeric or alpha-numeric) that provides for the accounting of a document. These can be in a printed code such as QR, PDF417 or other codes.
Steganography
The science of hiding Image(s) or information within other image(s) or information. In security documents, the hidden image or information is typically revealed with the aid of a decoder lens, scanning device, or decoding software in a handheld or desktop device.
Tactile Code
An image that has been embossed, debossed, or stamped into a surface of a substrate but has not been printed or foil stamped. Creates a raised impression used as an authenticator.
