50 U.S.C. § 426(2) (2010) (Title 50—Chapter 15: National Security--Subchapter D: Protection of Certain National Security Information)
For the purposes of this title [50 U.S.C. §§ 421 et seq.]:
(2) The term "authorized", when used with respect to access to classified information, means having authority, right, or permission pursuant to the provisions of a statute, Executive order, directive of the head of any department or agency engaged in foreign intelligence or counterintelligence activities, order of any United States court, or provisions of any Rule of the House of Representatives or resolution of the Senate which assigns responsibility within the respective House of Congress for the oversight of intelligence activities.