When it comes to medical data, there are specific conditions for data sharing. For example, the GD circular on secondary uses of health data states that the medical data shared for secondary use will be de-identified and sets detailed conditions for privacy, medical confidentiality and data security. Data sharing should also be done to advance the medical field. Moreover, this circular prohibits use whose social purpose is improper, with emphasis on discrimination in insurance or employment. Exclusive use of secondary health data is limited.