Article 15

(1) [Eligibility]
(a) Any State member of the World Intellectual Property Organization or of the United Nations may become party to this Treaty.
(b) Any Intergovernmental Organization which meets the requirements of Article 2(x) may become party to this Treaty. The Organization shall inform the Director General of its competence, and any subsequent changes in its competence, with respect to the matters governed by this Treaty. The Organization and its member States may, without, however, any derogation from the obligations under this Treaty, decide on their respective responsibilities for the performance of their obligations under this Treaty.

(2) [Adherence] A State or Intergovernmental Organization shall become party to this Treaty by:
(i) signature followed by the deposit of an instrument of ratification, acceptance or approval, or
(ii) the deposit of an instrument of accession.

(3) [Deposit of Instruments] The instruments referred to in paragraph (2) shall be deposited with the Director General.