In the past decade, application of digital multimedia contents has grown rapidly because of their advantages over analog contents. Ease of transferring and broadcasting over networks, higher quality and durability, online/offline easy editing, copying, and simplicity of archiving or storing are just a few advantages of digital multimedia over analog contents. Ironically, all the above advantageous properties have raised the main concerns in copyright management and privacy protection of such contents. Encryption methods such as conventional connection-based security systems cannot carry out the required proper protection level as it is impossible to monitor how a legitimate user handles the content after decryption, which makes it possible for hackers and adversaries to illegally redistribute or manipulate the content.

Digital Watermarking k-means clustering and Masking.