# Council Decision of 23 September 2013 on the security rules for protecting EU classified information (2013/488/EU), Division 33

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

A CIS shall treat any interconnected IT system as untrusted and shall implement protective measures to control the exchange of classified information.

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Source: https://www.legislation.gov.uk/eudn/2013/488/annex/IV/division/II/division/10/division/33 (the official version)
Page: https://openlegislation.uk/eu-decision-2013-488/annex-IV/division-II/division-10/division-33
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.