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In this paper, we introduce the concept of key-dependent basis functions and discuss its applications to secure robust watermarking for copyright protection and to designing secure public black-box watermark detectors. The new schemes overcome a possible security weakness of global, non-adaptive schemes that apply watermark patterns spanned by a small number of publicly known basis functions. The...
Adequate protection of digital copies of multimedia content - both audio and video — is a prerequisite to the distribution of this content over networks. Until recently digital audio and video content has been protected by its size: it is difficult to distribute and store without compression. Modern compression algorithms allow substantial bitrate reduction while maintaining highfidelity reproduction...
This paper presents a new approach for the secure and robust copyright protection of digital images. A system for generating digital watermarks and for trading watermarked images is described. The system is based on a new watermarking technique, which is robust against image transformation techniques such as compression, rotation, translation, scaling and cropping. It uses modulation of the magnitude...
In this paper a general model of a watermarking system for copyright protection of outputs from an arbitrary source is presented. This model is proposed as a framework for an information-theoretical analysis of watermarking schemes. The main elements which comprise such schemes are described, performance measures are defined and important issues such as imperceptibility, robustness and cryptographic...
Today watermarking of still and moving images is a wellknown technology enabling proof of authorship for the watermarked data. Similarly, there is a large interest in watermarking of audio data. Since the human auditory system is very sensitive to signal modifications, fairly elaborated schemes are required in order to perfectly/imperceptibly hide embedded data. This paper describes how to...
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