Multimedia technologies are becoming more sophisticated, enabling the Internet to accommodate a rapidly growing audience with a full range of services and efficient delivery methods. Although the Internet now puts communication, education, commerce and socialization at our finger tips, its rapid growth has raised some weighty security concerns with respect to multimedia content. This book focuses on the theory and state-of-the-art applications of content security. First part of this book highlights on quality access control of compressed & uncompressed gray scale & color images. The second part focuses on development of various data hiding schemes for error concealment for digital images, while the third part spotlights on development of data hiding scheme for the application of digital rights management. Major contributions in this part lie on access control & tracking of illicit distribution, authentication, integrity verification, copyright protection, tamper detection & correction. This book would be useful for research scholars, engineers, mobile & video company, banking service, computer scientists, forensic officer, medical industry, manufacturers & vendors and technicians.