3. The provisions of paragraph 2 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. (a) 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of unpublished works by the law of the Contracting State of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.
(b) For the purposes of the application of subparagraph (a),
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, 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.
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