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1. This Protocol shall be open for signature by Signatories to the Convention. It shall be subject to ratification, acceptance or approval. A Signatory may not ratify, accept or approve this Protocol unless it has previously ratified, accepted or approved the Convention, or does so simultaneously. Instruments of ratification, acceptance or approval shall be deposited with the Secretary General of the Council of Europe.
2. This Protocol shall enter into force on the first day of the month following the expiration of a period of three months after the deposit of the sixth instrument of ratification, acceptance or approval, including at least four member States of the Council of Europe.
3. In respect of any Signatory which subsequently deposits its instrument of ratification, acceptance or approval, this Protocol shall enter into force on the first day of the month following the expiration of a period of three months after the date of the deposit of the instrument of ratification, acceptance or approval.