Patent ID: 6325495
Filing Date: 2001-12-04
Classification: B41J

Abstract:
A method for preventing the unauthorized use of a cartridge, comprising the steps of:a) storing a first set of data in a smart button cellb) cryptographically signing said first set of data;c) storing said cryptographic signature into said smart button cell;d) affixing said smart button cell to a cartridge;e) inserting said cartridge into a host machine in a manner where data can be transferred between said smart button cell and said host machine;said host machine having a microprocessor and a memory;f) reading said first set of stored data, at said host machine;g) verifying said cryptographic signature stored in said smart button cell;h) determining if said cartridge is authorized for use in said host machine based upon said verification;I) enabling use of said cartridge if said cartridge is authorized; andII) preventing use of said cartridge if said cartridge is unauthorized.