A mating key gateway is adapted to retrieve a mating key, which is used to encrypt a program key that is used to scramble digital content prior to transmission to a digital device. According to one embodiment of the invention, the mating key gateway comprises a processor, a communication interface and...http://www.google.com/patents/US7565546?utm_source=gb-gplus-sharePatent US7565546 - System, method and apparatus for secure digital content transmission
