33(1)(a)

contains information or matter the disclosure of which under this Act could reasonably be expected to cause damage to the security, defence or international relations of the Commonwealth
— Section 33(1)(a) of the Archives Act 1983

1010

closed files

cite this as a reason you're not allowed to see them
60

years

is the average age of closed files that cite this reason, based on the date of their earliest content
108

series

contain closed files that cite this reason
20

years

is the average age of decisions to closed files citing this reason

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What series contain most closed files citing this reason?
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Here's some examples of closed files that cite this reason…

Series Control Symbol Title Contents dates
A1209 1957/5697 USSR. Weapons development - general 1957 - 1962
A1838 100/12/6 Political Intelligence and Reporting (Australian Secret Intelligence Service) 1954 - 1976
A12391 R98 New Scotland Yard Special Branch Annual Report 1974 1974 - 1974
A816 41/301/176 [Title of item withheld] 1952 - 1952
A4311 626/SE/10/D2 [South East Asia Treaty Organisation - Security Experts - the communist insurgent threat to the treaty area - paper by UK] 1959 - 1959
A1838 3027/2/1 PART 25 Malaysia - Political - General [3cm] 1965 - 1966
A2031 36/1952 Deception Planning 1952 - 1952
A6122 1196 Recording of ASIS personnel [Australian Secret Intelligence Service, Australian Security Intelligence Organisation] 1955 - 1955
A6122 838 Communist Party of Australia - (South Australia) Queenstown 1949 - 1957
A1838 TS694/2/3/4 PART 3 [Modified title: Exchange of information] 1969 - 1970
A6122 554 CPA - [Communist Party of Australia] Victoria Propaganda Committee 1949 - 1949
A1838 1605/145 PART 1 Immigration - Reciprocal social security agreement between Australia and Israel - Foreign relations - Aspects 1985 - 1985
A10872 100/3/9 Australian Secret Intelligence Service (ASIS) - Name of individual [imposed title, original title wholly exempt] 1957 - 1958
A432 1969/3072 ATTACHMENT 1 W.G. Burchett 1953 - 1954
A1533 1956/1470 [Modified title: CIS co-operation with ASIO - complaint regarding SJ MARUZEWSKI, aka MARUE] 1956 - 1956
AWM54 244/3/4 [Demolitions - Preparation:] Schedule of demolitions - Aerodromes and Air Bases beyond Australia 1941 - 1941
A13075 17919/C Decision No 17919 - [Title exempt] - Without Submission 03 May 1982 - 03 May 1982
A6122 828 Communist Party of Australia - Victoria - Burwood branch 1947 - 1956
A1838 TS694/2/3/4 PART 7 [Modified title: Exchange of information] 1972 - 1973
A6126 112 Doris Amelia BLACKBURN 1949 - 1960