EURion constellation

The EURion constellation (also known as Omron rings^[1] or doughnuts^[2]) is a pattern of symbols incorporated into a number of secure documents such as banknotes, checks, and ownership title certificates designs worldwide since about 1996. It is added to help imaging software detect the presence of such a document in a digital image. Such software can then block the user from reproducing banknotes to prevent counterfeiting using colour photocopiers.

used by some colour laser printers to add hidden encoded information to printouts

Printer steganography

an anti–copyright-infringement technology which marks each film print of a motion picture with distinguishing patterns of dots, used as a forensic identifier to identify the source of illegal copies

Coded anti-piracy

(Press release). Adobe Systems Incorporated.

"Photoshop and CDS"

- website of the Central Bank Counterfeit Deterrence Group (CBCDG)

The rules for currency image use

Nieves, J.; Ruiz-Agundez, I. & Bringas, P. (2010), 'Recognizing Banknote Patterns for Protecting Economic TransactionsDatabase and Expert Systems Applications (DEXA), 2010 Workshop on', IEEE, 247—249.