Article 3

1 This Protocol shall be open to signature by the member States of the Council of Europe which have signed the Convention. It shall be subject to ratification, acceptance or approval. Instruments of ratification, acceptance or approval shall be deposited with the Secretary General of the Council of Europe.

2 The Protocol shall enter into force 90 days after the date of the deposit of the third instrument of ratification, acceptance or approval.

3 In respect of a signatory State ratifying, accepting or approving subsequently, the Protocol shall enter into force 90 days after the date of the deposit of its instrument of ratification, acceptance or approval.

4 A member State of the Council of Europe may not ratify, accept or approve this Protocol without having, simultaneously or previously, ratified the Convention.