Today, in this technological world, the information available can be easily copied, manipulated, as well as broadcasted among different channels, which should be protected. In the case of the medical field, the reliability and authenticity of e-medical data is one of the serious concerns. The patient's data without the knowledge of user might be utilized by the intruders. Medical data is highly valuable for the purpose of diagnosis and treatment. Due to increase in the usage of internet, copyright protection, content authentication, and identity theft are considered to be the bottleneck issues for content proprietors. To resolve those issues, the authors focused on the study of watermarking technology, which is used to improve the security of data and protect information from unauthorized access. Multimedia watermarking plays a predominant role in preserving the information from unauthorized access. This chapter aims to provide the detailed review of various watermarking techniques, their applications for security purposes, and the e-verification of medical information.