Nowadays, health care is one of the most important subjects in life. In USA, 100 billion dollars will be spent on it in the next 10 years, according to experts. The Electronic Medical Record (EMR) is usually a computerized legal medical record created in an organization that delivers care, such as hospital and doctors' surgery. In the age of technology, one of the most important factors for EMR is that it secures the records for the patients, protects their rights and is responsible for the disclosure of their data. An overview of this study has presented the importance of the privacy of the EMR and the patients' rights. In addition, cryptography algorithms and security requirements have been discussed and the paper has also discussed different architecture, designs and systems that have been reported in the literature. In a nutshell, most of these systems are poor in terms of achieving the security requirements, while on the other side, most of the systems have not discussed the patients' rights and how the system can detect the persons who broadcast these records.