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50 years, there are two exceptions, and classifications beyond 75 years require special permission. Because of changes in policy and circumstances, agencies are expected to actively review documents that have been classified for fewer than 25 years. They must also respond to
Mandatory Declassification Review and
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Congress. The originating agency assigns a declassification date, by default 25 years. After 25 years, declassification review is automatic with nine narrow exceptions that allow information to remain as classified. At
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Classified information in the United States § Declassification
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466:. September 9, 2014
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