Svc encryption apparatus and method and contents providing system and method

An SVC encryption method comprising:

• performing SVC (Scalable Video Coding) encoding on input contents and carrying out encryption for data in accordance with a first encryption condition to generate a corresponding SVC bitstream;
• analyzing NAL (Network Adaptation Layer) data of the generated SVC bitstream to find out NAL data satisfying a second encryption condition;
• encrypting extracted NAL data in accordance with the second encryption condition;
• and
• transmitting the SVC bitstream with encrypted NAL data.

An contents providing system comprising:

• a contents service apparatus for carrying out SVC (Scalable Video Coding) encryption of requested contents to generate an SVC bitstream, and encrypting NAL data extracted from the generated SVC bitstream to transmit the SVC bitstream with the encrypted NAL data;
• a media conversion apparatus for carrying out media conversion for the transmitted SVC bitstream in accordance with a terminal condition;
• and
• a client terminal apparatus for decoding the media-converted SVC bitstream to reproduce corresponding contents.

A contents providing method comprising:

• SVC (Scalable Video Coding) encrypting for requested contents to generate an SVC bitstream;
• encrypting NAL data extracted from the generated SVC bitstream;
• transmitting the SVC bitstream with encrypted NAL data;
• carrying out media conversion for the transmitted SVC bitstream in accordance with a terminal condition to transmit the media-converted SVC bitstream to a client terminal apparatus.