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D Notice, DA Notice
D notice, DA notice

A Defence Advisory notice, formerly called a D Notice (Defence Notice), is part government guidance, and in part informal warning, to the British media and book publishers to encourage them to exercise self-censorship on sensitive matters of national security.

There are currently five standing DA notices, phrased in general terms, covering military operations; nuclear and non-nuclear weapons; ciphers and secure communications; sensitive installations and home addresses; security and intelligence services, and special forces (such as the SAS).

Such notices are approved by, and can be read on the website of, the Defence, Press and Broadcasting Advisory Committee, chaired by the Permanent Under-Secretary of State for Defence, on which sit 13 media representatives, nominated by newspaper and magazines employers' associations, the Press ...

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