1. A service feature or technique used to permit or deny use of the components of a communication system. 2. A technique used to define or restrict the rights of individuals or application programs to obtain data from, or place data onto, a storage device. 3. The definition or restriction of the rights of individuals or application programs to obtain data from, or place data into, a storage device. 4. Limiting access to information system resources only to authorized users, programs, processes, or other systems. 5. That function performed by the resource controller that allocates system resources to satisfy user requests. 6. Control over the flow of information between entities. 7. The prevention of access without access rights. 8. The prevention of use of a resource by unidentified and/or authorized entities in any other than an authorized manner. 9. The prevention of unauthorized use of a resource including the prevention of use of a resource in an unauthorized manner. . 10. The prevention of unauthorized access of subjects to objects.