Digital rights management using proximity testing

摘要

A method and system for preventing unauthorized use of copyrighted digital information includes transmitting verification data from a source to a receiving device. The verification data includes a secure source identifier. A reply message from the receiving device includes a secure confirmation of receipt for the verification data and a secure identifier of the receiving device. An elapsed time is determined between the time of transmission of verification data and the time of receipt of the reply message. Authorization to use or receive the digital content is based at least in part on the elapsed time.