A method, apparatus, and system for providing secure communication between a tamper resistant device (404) and a sink device (406) is disclosed. Encrypted content is received from a source device (402) at the tamper resistant device (404), wherein the content has been encrypted using a first key. The...http://www.google.de/patents/US7688982?utm_source=gb-gplus-sharePatent US7688982 - Protected return path from digital rights management dongle
