Combination of encryption and digital watermarking techniques used for security and copyright protection of still image

For faster transmission of the question paper of university exam, electronic system is used along with wired or wireless network. This system avoids the physical work of staff. It helps to transport the question papers of university exam within short period of time to respected colleges. However, the issue of copyright protection and security issue arise. There are many techniques use in practice to provide the copyright protection such as digital watermarking techniques using various transforms and Computational Intelligence techniques. Security can be provided by encryption and decryption technique using various methods such as RSA, AES, DES, etc. In this paper, it is going to discuss the combination of encryption and digital watermarking techniques used for security and copyright protection of still image.