This reminds me of the banknote copy protection which is builtin in many scanners and copiers, the so-called 'EURion Constellation'. It consists of a number of

This reminds me of the banknote copy protection which is builtin in many scanners and copiers, the so-called 'EURion Constellation'. It consists of a number of circles in a specific configuration. For a picture and more info, see http://en.wikipedia.org/wiki/Eurion http://en.wikipedia.org/wiki/Eurion and/or http://www.grimes.demon.co.uk/security/currency.htm http://www.grimes.demon.co.uk/security/currency.htm