Patent ID: 7353393

Claim:
A method for authenticating a digital pen at a service handler in a system including at least one paper look-up server, at least one digital pen and at least one service handler, the method including the steps of: sending encrypted data and a digital pen identifier from said digital pen to said paper look-up server, said encrypted data including position data obtained by using said digital pen to read a position code from a surface of a position-coded product; identifying at said paper look-up server, based on said position data, a service handler that provides a service associated with said position-coded product; authenticating said digital pen and creating an authentication receipt at said paper look-up server; sending an indication of the identified service handler and said authentication receipt from said paper look-up server to said digital pen; sending said authentication receipt from said digital pen to said identified service handler; and authenticating said digital pen at said identified service handler based on the received authentication receipt thereby allowing said identified service handler to provide a service associated with said position-coded product.