Declassified, as well as currently classified, government information can be an important source for understanding U.S. policy. (Much of the classified information leaked by Pvt. Bradley -- now Chelsea -- Manning and Edward Snowden remains classified, even though it is now readily available.)
The purpose of this guide is to facilitate access to classified and declassified government information in Pitt's library system or on the Web.
Executive Order 13526 defines "classified information" as "information that has been determined ... to require protection against unauthorized disclosure ..."
The order explains that government information can be classified only if "the original classification authority determines that the unauthorized disclosure of the information reasonably could be expected to result in damage to the national security, ... and the original classification authority is able to identify or describe the damage."
This order describes five methods for the declassification of government information:
In addition to these methods, documents may be declassified by a Congressional statute, or in response to Freedom of Information Act (FOIA) requests.
Currently, classification and declassification of U.S. government information is governed by Executive Order 13526, Issued by President Barack Obama on December 29, 2009.