Patent ID: 8514926
Filing Date: 2013-08-20
Classification: H04N

Abstract:
1. A scalable video bitstream encryption and decryption system, comprising: a scalable video coding (SVC) bitstream encryption section for encrypting a scalable video bitstream; a bitstream extraction unit for extracting network abstraction layer (NAL) data of a specific scalability from the SVC bitstream; and an SVC bitstream decryption section for decrypting the scalable video bitstream transmitted from the SVC bitstream encryption section; wherein the SVC bitstream encryption section comprises: an SVC bitstream creation unit for creating NAL data and headers of the NAL data according to preset scalabilities by using an input video signal, and creating an SVC bitstream including the NAL data and the NAL headers; a NAL data identification unit for identifying NAL data to be encrypted from the NAL data included in the SVC bitstream, and extracting at least two pieces of scalability information, relating to different scalabilities, from the NAL data to be encrypted; a key input unit for outputting encryption keys corresponding to the at least two pieces of scalability information, wherein a number of the encryption keys is equal to a number of the at least two pieces of scalability information; and a data encryption unit for encrypting units of NAL data having scalability information equal to anyone of the at least two pieces of scalability information based on an SVC syntax by using the encryption keys, wherein each of the encryption keys is used for a different one of the at least two pieces of scalability information.