t the
complainant must deposit with the court or an administrative office, or
both, a copy of the work involved in the litigation; provided that
failure to comply with such requirements shall not affect the validity
of the copyright, nor shall any such requirement be imposed upon a
national of another Contracting State if such requirement is not
imposed on nationals of the State in which protection is claimed.

4. In each Contracting State there shall be legal means of protecting
without formalities the unpublished work of nationals of other
Contracting States.

5. If a Contracting State grants protection for more than one term of
copyright and the first term is for a period longer than one of the
minimum periods prescribed in Article IV, such State shall not be
required to comply with the provisions of paragraph 1 of this Article
in respect of the second or any subsequent term of copyright.

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. (a) The term of protection for works protected under this Convention
shall not be less that the life of the author and twenty-five 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 this 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 twenty-five years from
the date of first publication.

(b) 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 twenty-five
years from the date of first publication or from its registration prior
to publication, as the case may be.

(c) 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 in subparagraphs
(a) and (b).

3. The provisions of