# Council Decision of 23 September 2013 on the security rules for protecting EU classified information (2013/488/EU), Division 31

Extent: E+W+S+N.I.

Within a building or self-contained group of buildings, information classified TRÈS SECRET UE/EU TOP SECRET shall be carried in a secured envelope bearing only the addressee’s name.

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Source: https://www.legislation.gov.uk/eudn/2013/488/annex/III/division/V/division/3/division/31 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-488/annex-III/division-V/division-3/division-31
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.