5.
2013/488/EU: Council Decision of 23 September 2013 on the security rules for protecting EU classified information · European Union
The security classification shall be clearly and correctly indicated, regardless of whether the EUCI is on paper, oral, electronic or in any other form.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.