Contents: Chapter 1 Introduction 1.1 Digital watermarking 1.2 Digital steganography 1.3 Differences between watermarking and steganography 1.4 A brief history Chapter 2 Classification in digital watermarking 2.1 Classification based on characteristics 2.2 Classification based on applications Chapter 3 Mathematical preliminaries 3.1 Least-significant-bit substitution 3.2 …