Adaptive security policy based scalable video service apparatus and method

An adaptive security policy based scalable video service method for providing a video streaming service from a video streaming server to a terminal, the method comprising:

• receiving from the video streaming server a service policy description issuance request along with a service profile;
• extracting a service demand and media layer structure information from the service profile;
• analyzing the service demand and checking a distribution ratio of visually important parts of a scalable video;
• generating a security policy description based on the service demand and the distribution ratio, wherein the security policy description defines a part to be encrypted, an encryption algorithm, and an encryption key length for each layer of video data;
• storing the security policy description in a database;
• and
• transmitting the security policy description to the video streaming server.

An adaptive security policy based scalable video service method of a terminal for providing a scalable video service by receiving encrypted data from a video streaming server, the method comprising:

• transmitting a streaming service request along with a service demand to the video streaming server;
• separately extracting video data, a security policy description, and streaming control data from the encrypted data received from the video streaming server, wherein the security policy description defines a part to be encrypted, an encryption algorithm, and an encryption key length for each layer of the video data;
• and
• performing adaptive decryption on the video data based on the security policy description.