A method for binding a computer program to an analog physical signature device to form an interactive system for controlling the use of the computer program, the method comprising the steps of providing instructions comprising the computer program, the instructions implementing an intended functionality,...http://www.google.com.au/patents/US7475255?utm_source=gb-gplus-sharePatent US7475255 - Analog physical signature devices and methods and systems for using such devices to secure the use of computer resources
