Special access program

Definition
A special access program is any program imposing need-to-know or access controls beyond those normally required for access to Confidential, Secret, or Top Secret information.

Overview
Such a program includes, but is not limited to, special clearance of investigative requirements, special designation of officials authorized to determine need-to-know, or special lists of persons determined to have a need-to-know.

Source

 * DOD Directive 5200.28.