The original purpose of hiding data in electronic media was to identify authors, distributors, and other legitimate parties as part of combating piracy. Recently, however, meta data is also being hidden in media to provide additional functions to the signal. Information and computer scientists provide theoretical frameworks, recent empirical research results, and new applications for the benefit of new or experienced researchers and for media content manufacturers who would like to apply the technology. They cover information hiding for audio and speech, for images and video, for text and binary data, and for multimedia. The topics include interpolation for audio and speech signals, enhancing speech quality of telephone communications by steganography, new proposals for hiding data in paper media, self-embedding watermarking with content restoration capabilities