Article IV

1. The duration of protection of a work shall be governed, in accordance with the provisions of article II and this article, by the law of the Contracting State in which protection is claimed.

2. The term of protection for works protected under this Convention shall not be less than the life of the author and 25 years after his death.
However, any Contracting State which, on the effective date of this Convention in that State, has limited this term for certain classes of works to a period computed from the first publication of the work, shall be entitled to maintain these exceptions and to extend them to other classes of works. For all these classes the term of protection shall not be less than 25 years from the date of first publication.
Any Contracting State which, upon the effective date of this Convention in that State, does not compute the term of protection upon the basis of the life of the author, shall be entitled to compute the term of protection from the date of the first publication of the work or from its registration prior to publication, as the case may be, provided the term of protection shall not be less than 25 years from the date of first publication or from its registration prior to publication, as the case may be.
If the legislation of a Contracting State grants two or more successive terms of protection, the duration of the first term shall not be less than one of the minimum periods specified above.

3. The provisions of paragraph 2 of this article shall not apply to photographic works or to works of applied art; provided, however, that the term of protection in those Contracting States which protect photographic works, or works of applied art in so far as they are protected as artistic works, shall not be less than ten years for each of said classes of works.

4. No Contracting State shall be obliged to grant protection to a work for a period longer than that fixed for the class of works to which the work in question belongs, in the case of unpublished works by the law of the Contracting State of which the author is a national, and in the case of published works by the law of the Contracting State in which the work has been first published.
For the purposes of the application of the preceding provision, if the law of any Contracting State grants two or more successive terms of protection, the period of protection of that State shall be considered to be the aggregate of those terms. However, if a specified work is not protected by such State during the second or any subsequent term for any reason, the other Contracting States shall not be obliged to protect it during the second or any subsequent term.

5. For the purposes of the application of paragraph 4 of this article, the work of a national of a Contracting State, first published in a non-Contracting State, shall be treated as though first published in the Contracting State of which the author is a national.

6. For the purposes of the application of paragraph 4 of this article, in case of simultaneous publication in two or more Contracting States, the work shall be treated as though first published in the State which affords the shortest term; any work published in two or more Contracting States within thirty days of its first publication shall be considered as having been published simultaneously in said Contracting States.