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In the United Kingdom, a DSMA-Notice (Defence and Security Media Advisory Notice)[1] is an official request to news editors not to publish or broadcast items on specified subjects for reasons of national security. DSMA-Notices were originally called a Defence Notice (D-Notice) from 1912 to 1993, and DA-Notice (Defence Advisory Notice) from 1993 until the mid-2010s.
A similar system was previously operational in Australia, but has fallen into disuse.
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