Patent ID: 8259949
Filing Date: 2012-09-04
Classification: H04L

Abstract:
1. A method for protecting digital content, the method comprising: receiving, at a source device, a digital certificate from a presentation device; using public key infrastructure (PKI) to determine, at the source device, whether the presentation device has been authorized by a certificate authority (CA) to receive protected content; generating a session key and a master key at the source device; receiving a nonce from the presentation device; using the session key to encrypt data comprising video data that includes pixels within lines within frames; using the master key and the nonce from the presentation device to encrypt the session key; transmitting the encrypted session key to the presentation device before transmitting the encrypted data to the presentation device; and transmitting the encrypted data to the presentation device only if the source device determines that the presentation device has been authorized by the CA to receive protected content; wherein the operation of using the session key to encrypt data comprises: