Article 16

(1) [Initial Entry Into Force] This Treaty shall enter into force, with respect to each of the first five States or Intergovernmental Organizations which have deposited their instruments of ratification, acceptance, approval or accession, three months after the date on which the fifth instrument of ratification, acceptance, approval or accession has been deposited.

(2) [States and Intergovernmental Organizations Not Covered by the Initial Entry Into Force] This Treaty shall enter into force with respect to any State or Intergovernmental Organization not covered by paragraph (1) three months after the date on which that State or Intergovernmental Organization has deposited its instrument of ratification, acceptance, approval or accession unless a later date has been indicated in the instrument; in the latter case, this Treaty shall enter into force with respect to the said State or Intergovernmental Organization on the date thus indicated.

(3) [Protection of Layout-Designs (Topographies) Existing at Time of Entry Into Force] Any Contracting Party shall have the right not to apply this Treaty to any layout-design (topography) that exists at the time this Treaty enters into force in respect of that Contracting Party, provided that this provision does not affect any protection that such layout-design (topography) may, at that time, enjoy in the territory of that Contracting Party by virtue of international obligations other than those resulting from this Treaty or the legislation of the said Contracting Party.