(1) This Act shall, as regards relations between the countries of the Union, and to the extent that it applies, replace the Berne Convention of September 9, 1886, and the subsequent Acts of revision. The Acts previously in force shall continue to be applicable, in their entirety or to the extent that this Act does not replace them by virtue of the preceding sentence, in relations with countries of the Union which do not ratify or accede to this Act.
(2) Countries outside the Union which become party to this Act shall, subject to paragraph (3), apply it with respect to any country of the Union not bound by this Act or which, although bound by this Act, has made a declaration pursuant to Article 28 (1) (b). Such countries recognize that the said country of the Union, in its relations with them:
(i) may apply the provisions of the most recent Act by which it is bound, and
(ii) subject to Article I (6) of the Appendix, has the right to adapt the protection to the level provided for by this Act.
(3) Any country which has availed itself of any of the faculties provided for in the Appendix may apply the provisions of the Appendix relating to the faculty or faculties of which it has availed itself in its relations with any other country of the Union which is not bound by this Act, provided that the latter country has accepted the application of the said provisions.