EARLY CONTENT ENGINE RECEIVER SYNCHRONIZATION

摘要

An HDCP receiver device that receives frames from an HDCP transmitter device. The receiver device has a frame counter that is updated for each frame that is received from the transmitter device and that includes encrypted content, while the receiver device is in a pre-authorization mode. During the pre-authorization mode, the receiver device does not decrypt any received frame bearing encrypted content. While the receiver device waits to transition from the pre-authorization mode to a post-authorization mode in which the receiver device can begin to decrypt any received frames that include encrypted content, the frame counter is updated for each frame received that includes encrypted content. In the post-authorization mode, the frame counter has a nonzero value if frames including encrypted content were received by the receiver device during the pre-authorization mode.

主权项

1. A method, comprising:
receiving, at a receiver device, frames from a transmitter device; and in response to receiving frames including encrypted content, the receiver device updating its internal state while the receiver device is in a pre-authorization mode or prior to completion of a session key exchange between the receiver device and the transmitter device, where, in the pre-authorization mode, the receiver device awaits authorization to decrypt any received frames that include encrypted content.