Challenges of Multimedia Watermarking Techniques
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Date
2005-02-02
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Publisher
INFLIBNET Centre
Abstract
Data transmitted through a network may be protected from unauthorized receivers by
applying techniques based on cryptography. Only people who possess the appropriate
private key can decrypt the received data using a public algorithm implemented either in
hardware or in software. Fast implementation of encryption-decryption algorithms is highly
desirable. Data-content manipulation can be performed for various legal or illegal purposes
(compression, noise removal or malicious data modification). The modified product is not
authentic with respect to the original one. The technology of multimedia services grows
rapidly, and distributed access to such ser-vices through computer networks is a matter of
urgency. However, network access does not protect the copyright of digital products that can
be reproduced and used illegally. An efficient way to solve this problem is to use watermarks.
A watermark is a secret code described by a digital signal carrying information about the
copyright property of the product. The watermark is embedded in the digital data such that
it is perceptually not visible. The copyright holder is the only person who can show the
existence of his own watermark and to prove the origin of the product Reproduction of
digital products is easy and inexpensive. In a network environment, like the Web,
retransmission of copies all throughout the world is easy. The problem of protecting the
intellectual property of digital products has been treated in the last few years with the
introduction of the notion of watermarks.
Description
Keywords
Multimedia Encryption, Watermarking, IPR, Copyrights