Discretionary access control (DAC)
Discretionary access control is the principle of restricting access to objects based on the identity of the subject (the user or the group to which the user belongs). Discretionary access control is implemented using access control lists. A resource profile contains an access control list that identifies the users who can access the resource and the authority (such as read or update) the user is allowed in referencing the resource. The security administrator defines a profile for each object (a resource or group of resources), and updates the access control list for the profile. This type of control is discretionary in the sense that subjects can manipulate it, because the owner of a resource, in addition to the security administrator, can identify who can access the resource and with what authority.