Partitioning and Decryption Methods for ChinaDRM Standards-Compliant Encrypted Bitstreams

Radio and TV smart terminals are rapidly iterating, and users' demand for audio and video services is also increasing. Global content producers are turning to 4K and HDR technologies. The development of these new technologies has brought new challenges to digital rights management. China needs to build its own digital rights management system, which will facilitate the commercial application of 4K and other ultra-high-definition technologies in major enterprises in China. At this stage, China has established the ChinaDRM ecosystem and has issued a number of industry standards to provide solutions for companies to develop digital rights management systems. This paper will propose the division and decryption methods of the bitstream and this encrypted bitstream defined in the standard "Technical specification of digital rights management for video audio content distribution" (GY/T 277-2019). Using the methods proposed in the paper to divide, decrypt and play the video bitstream after finishing format conversion, it can verify whether the transmitted audio and video stream complies with the standard, so as to verify the correctness of the encryption and modify the existing problems.