4.
2013/488/EU: Council Decision of 23 September 2013 on the security rules for protecting EU classified information · European Union
The National Security Authority (NSA), the Designated Security Authority (DSA) or any other competent authority of each Member State shall ensure, to the extent possible under national laws and regulations, that contractors and subcontractors registered in their territory take all appropriate measures to protect EUCI in pre-contract negotiations and when performing a classified contract.
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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.