of the librarian of a library of a class prescribed by regulations made under this subsection by the Board of Trade, and the conditions prescribed by those regulations are complied with.
(2) In making any regulations for the purposes of the preceding subsection the Board of Trade shall make such provision as the Board may consider appropriate for securing—
(b) that the copies in question are supplied only to persons satisfying the librarian, or a person acting on his behalf, that they require them for purposes of research or private study and will not use them for any other purpose;
(c) that no person is furnished under the regulations with two or more copies of the same article;
(d) that no copy extends to more than one article contained in any one publication; and
(e) that persons to whom copies are supplied under the regulations are required to pay for them a sum not less than the cost (including a contribution to the general expenses of the library) attributable to their production,
and may impose such other requirements (if any) as may appear to the Board to be expedient.
(3) The copyright in a published literary, dramatic or musical work, other than an article contained in a periodical publication, is not infringed by the making or supplying of a copy of part of the work, if the copy is made or supplied by or on behalf of the librarian of a library of a class prescribed by regulations made under this subsection by the Board of Trade, and the conditions prescribed by those regulations are complied with:
Provided that this subsection shall not apply if, at the time when the copy is made, the librarian knows the name and address of a person entitled to authorise the making of the copy, or could by reasonable inquiry ascertain the name and address of such a person.
(4) The provisions of subsection (2) of this section shall apply for the purposes of the last preceding subsection:
Provided that paragraph (d) of the said subsection (2) shall not apply for those purposes, but any regulations made under the last preceding subsection shall include such provision as the Board of Trade may consider appropriate for securing that no copy to which the regulations apply extends to more than a reasonable proportion of the work in question.