US Patent 7784681 Method and apparatus for security document tracking

A method of tracking a security document having disposed thereon or therein a number of coded data portions, each coded data portion being indicative of an identity of the security document. The method includes having a computer system receive indicating data from a sensing device, the sensing device being responsive to sensing of the coded data to generate indicating data indicative of the identity of the product item. The computer system uses the indicating data to update tracking data stored in a data store, the tracking data being indicative of the identity of the security document and tracking information.