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What is Authorized Device

Chapter 22
Handbook of Research on Secure Multimedia Distribution
The technology may be a physical device that an authorized user of computer services is given to aid in authentication. An authorization is the concept of allowing access to resources only to those permitted to use them. More formally, authorization is a process (often part of the operating system) that protects computer resources by only allowing those resources to be used by resource consumers that have been granted authority to use them. Resources include individual files’ or items’ data, computer programs, computer devices and functionality provided by computer applications.
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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