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What is A/V Encryption

Chapter 22
Handbook of Research on Secure Multimedia Distribution
This algorithm can be used as one of access content system. The access content system (ACS) is a standard for content distribution and digital rights management, intended to restrict access to and copying of the next generation of optical discs and DVDs. The specification was publicly released in Apr. 2005 and the standard has been adopted as the access restriction scheme for HD DVD and Blu-ray Disc (BD).
Published in Chapter:
Copyright Protection of A/V Codec for Mobile Multimedia Devices
Goo-Rak Kwon (Chosun University, Korea) and Sung-Jea Ko (Korea University, Korea)
Copyright: © 2009 |Pages: 14
DOI: 10.4018/978-1-60566-262-6.ch022
Abstract
The objective of this chapter introduces an advanced encryption of MP3 and MPEG-4 coder with a quality degradation-based security model. For the MP3 audio, the magnitude, and phase information of modified discrete cosine transform (MDCT) coefficients is encrypted. DCT coefficients and motion vectors (MVs) are used for the scrambling of the MPEG-4 video. This encryption scheme has a level of security, secures in perception, keeps format compliance, and obtains high time efficiency though reducing the encrypted the volumes of multimedia contents. These properties make it practical to incorporate encryption and decryption process into compression and decompression process, and thus suitable for secure A/V transmission or sharing.
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