Patent ID: 8478983

Claim:
A method for maintaining information security in a video multicasting service, the method comprising: generating a network abstraction layer unit using received video information, the network abstraction layer unit including network abstraction layer (NAL) Unit Type information and dependency_ID (DID), temporal_level_ID (TID) and quality_level_ID (QID) information; extracting the NAL Unit Type information and the DID, TID and QID information from the network abstraction layer unit; encrypting the network abstraction layer unit of the video information; realtime transport protocol (RTP) packetizing the encrypted network abstraction layer unit of the video information, wherein the encrypted network abstraction layer unit is loaded on a payload of an RTP packet; recording the extracted NAL Unit Type information and DID, TID and QID information in a header extension field of an RTP header of the RTP packet without encryption; and transmitting the RTP packet including the encrypted video information and the unencrypted NAL Unit Type information and DID, TID and QID information to a routing device.