reasonably related to
that normally charged in the State for comparable works, by the owner
of the right of reproduction or with his authorization, any national of
such State may obtain a non-exclusive licence from the competent
authority to publish such edition at that or a lower price for use in
connexion with systematic instructional activities. The licence may
only be granted if such national, in accordance with the procedure of
the State concerned, established either that he has requested, and been
denied, authorization by the proprietor of the right to publish such
work, or that, after due diligence on his part, he was unable to find
the owner of the right. At the same time as he makes his request he
shall inform either the international copyright information centre
established by the United Nations Educational, Scientific and Cultural
Organization or any national or regional information centre referred to
in sub-paragraph (d).

(b) A licence may also be granted on the same conditions if, for a
period of six months, no authorized copies of the edition in question
have been on sale in the State concerned to the general public or in
connexion with systematic instructional activities at a price
reasonably related to that normally charged in the State for comparable
works.

(c) The period referred to in sub-paragraph (a) shall be five years
except that:

(i) for works of the natural and physical sciences, including
mathematics, and of technology, the period shall be three years;

(ii) for works of fiction, poetry, drama and music, and for art books,
the period shall be seven years.

(d) If the owner of the right of reproduction cannot be found, the
applicant for a licence shall send, by registered air mail, copies of
his application to the publisher whose name appears on the work and to
any national or regional information centre identified as such in a
notification deposited with the Director-General by the State in which
the publisher is believed to have his principal place of business. In
the absence of any such notification, he shall also send a copy to the
international copyright information centre established by the United
Nations Education, Scientific and Cultural Organization. The licence
shall not be granted before the expiration of a period of three months
from the date of dispatch of the copies of the application.

(e) Licenses obtainable after three years shall not be granted under
this Articl