18 USC App 1: Definitions
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*Public Law 119-60 has been enacted, but classifications have not been finalized. The currency ("laws in effect") date does not reflect acts for which classifications have not been finalized.

18 USC App 1: Definitions Text contains those laws in effect on January 14, 2026
From Title 18-AppendixCLASSIFIED INFORMATION PROCEDURES ACT
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§1. Definitions

(a) "Classified information", as used in this Act, means any information or material that has been determined by the United States Government pursuant to an Executive order, statute, or regulation, to require protection against unauthorized disclosure for reasons of national security and any restricted data, as defined in paragraph r. of section 11 of the Atomic Energy Act of 1954 (42 U.S.C. 2014(y)).

(b) "National security", as used in this Act, means the national defense and foreign relations of the United States.

( Pub. L. 96–456, §1, Oct. 15, 1980, 94 Stat. 2025 .)