EXECUTIVE ORDER 12958
CLASSIFIED NATIONAL SECURITY INFORMATION
This order prescribes a uniform system for classifying, safeguarding, and declassifying national security information. Our democratic principles require that the American people be informed of the activities of their Government. Also, our Nation's progress depends on the free flow of information. Nevertheless, throughout our history, the national interest has required that certain information be maintained in confidence in order to protect our citizens, our democratic institutions, and our participation within the community of nations. Protecting information critical to our Nation's security remains a priority. In recent years, however, dramatic changes have altered, although not eliminated, the national security threats that we confront. These changes provide a greater opportunity to emphasize our commitment to open Government.
http://www.fas.org/sgp/clinton/eo12958.html By law, Cheney is supposed to comply to this order, yet he has not done so for years, claiming he does not have to.