Steganography, a means by which two or more parties may communicate invisibly by hiding secrets in innocuous messages, and watermarking, a means of hiding copyright data in images, are becoming necessary components of commercial multimedia applications that are vulnerable to illegal use. This collection of nine contributions first reviews steganography with a description of possible applications and a survey of methods used to hide information in modern media. The second part introduces watermarking methods, discusses the similarities and differences that characterize watermarking and steganography, and explores the legal implications of watermarking and copyright issues on the Internet.Book News, Inc.®, Portland, OR