Patent ID: 9654810
Date: 2017-05-16
CPC Classifications: H04L,H04N

Claim:
1. A method performed at a source device, the method comprising: receiving a first type of content selected from a group of audio content, video content, and control content, and a second type of content selected from the group, the second type of content different from the first type of content; determining the first type of content to be encrypted and the second type of content to remain unencrypted; inserting, in a data stream, a first flag between a first guardband character and the first type of content, the first flag indicating the first type of content to be encrypted for transmission of the first type of content; inserting, in the data stream, a second flag between a second guardband character and the second type of content, the second flag indicating the second type of content to remain unencrypted during transmission of the second type of content; encrypting the first type of content but not the second type of content, an encrypted version of the first type of content accessible by an intermediate device but not by a sink device, an unencrypted version of the second type of content accessible by the intermediate device and the sink device, the intermediate device separate and distinct from the source device and the sink device, the intermediate device performing analysis or modification of the data stream based on the first flag indicating the first type of content to be encrypted and the second flag indicating the second type of content to remain unencrypted, and sending the analyzed or modified data stream to the sink device; and transmitting the data stream including the first flag, the encrypted version of the first type of content, the second flag, and the unencrypted version of the second type of content to the intermediate device.