The paper discusses the field of information hiding, including steganography and digital watermarking. It reviews the history and applications of these techniques, highlighting their use in various domains such as military communications, digital elections, and copyright protection. The paper also addresses the challenges and limitations of these techniques, including their vulnerability to attacks and the need for robustness. It outlines different types of information hiding techniques, such as camouflage, spreading hidden information, and environment-specific methods. The paper emphasizes the importance of robustness in copyright marking and the need for secure and reliable methods to protect digital content. It also discusses the limitations of current information hiding systems and the need for further research in this area. The paper concludes with a call for continued research and development in information hiding techniques to address the growing challenges in digital content protection.The paper discusses the field of information hiding, including steganography and digital watermarking. It reviews the history and applications of these techniques, highlighting their use in various domains such as military communications, digital elections, and copyright protection. The paper also addresses the challenges and limitations of these techniques, including their vulnerability to attacks and the need for robustness. It outlines different types of information hiding techniques, such as camouflage, spreading hidden information, and environment-specific methods. The paper emphasizes the importance of robustness in copyright marking and the need for secure and reliable methods to protect digital content. It also discusses the limitations of current information hiding systems and the need for further research in this area. The paper concludes with a call for continued research and development in information hiding techniques to address the growing challenges in digital content protection.