Article 2 Definition of EUCI, security classifications and markings
1. ‘EU classified information’ (EUCI) means any information or material designated by an EU security classification, the unauthorised disclosure of which could cause varying degrees of prejudice to the interests of the European Union or of one or more of the Member States.
2. EUCI shall be classified at one of the following levels:

(a) TRÈS SECRET UE/EU TOP SECRET
information and material the unauthorised disclosure of which could cause exceptionally grave prejudice to the essential interests of the European Union or of one or more of the Member States;

(b) SECRET UE/EU SECRET
information and material the unauthorised disclosure of which could seriously harm the essential interests of the European Union or of one or more of the Member States;

(c) CONFIDENTIEL UE/EU CONFIDENTIAL
information and material the unauthorised disclosure of which could harm the essential interests of the European Union or of one or more of the Member States;

(d) RESTREINT UE/EU RESTRICTED
information and material the unauthorised disclosure of which could be disadvantageous to the interests of the European Union or of one or more of the Member States.
3. EUCI shall bear a security classification marking in accordance with paragraph 2. It may bear additional markings to designate the field of activity to which it relates, identify the originator, limit distribution, restrict use or indicate releasability.