This book deals with digital watermarking, which is defined by the
authors of this book as the art of hiding auxiliary information in
digital data in a secure, robust and imperceptible fashion. Digital
watermarking as a topic has a long history, but before 1995 publications
in scientific literature were almost absent. From 1995 onwards however
the number of publications on watermarking has been steadily increasing.
Today a number of workshops and conferences on this topic exist; also a
number of scientific journals on watermarking have been published. This
renewed scientific interest in digital watermarking has led very quickly
to industrial interest, as well. In 1996 the Copy Protection Technical
Working Group, a voluntary consortium consisting of the movie industry,
the IT industry and the consumer electronics industry, issued a call for
watermarking technologies for the purpose of copy protection of
DVD-Video. A few years later the Secure Digital Music Initiative issued
a similar call, in this case focusing on copy protection of digital
music. These two efforts have been only partially successful: copy
protection based on digital watermarking is not (yet) implemented on a
large scale in any type of consumer device. This current "failure" of
watermarking, to live up to its expectations, finds its cause in a large
number of reasons, ranging from legal considerations and system aspects
to the relative immaturity of watermarking as a technology.