Explanation/Reference:
Content dependent access control involves restricting access to content, such as documents and emails, based on embedded keywords or certain assigned metadata. It works by inspecting the content and applying rules to determine if access is permitted.
This approach is taken by many Data Loss Prevention solutions. It is possible to combine content dependent access control with role-based access control in order to restrict access to content by established roles.
Reference: Oracle Reference Architecture, Security , Release 3.1