—cont.(5) The copyright in a published literary, dramatic or musical work is not infringed by the making or supplying of a copy of the work, or of part of it, 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, if—
(b) at the time when the copy is made, the librarian by or on whose behalf it is supplied does not know the name and address of any person entitled to authorise the making of the copy, and could not by reasonable inquiry ascertain the name and address of such a person; and
(c) any other conditions prescribed by the regulations are complied with:
Provided that the condition specified in paragraph (b) of this subsection shall not apply in the case of an article contained in a periodical publication.
(6) Where, at a time more than fifty years from the end of the calendar year in which the author of a literary, dramatic or musical work died, and more than one hundred years after the time, or the end of the period, at or during which the work was made,—
(b) the work has not been published, and
(c) the manuscript or a copy of the work is kept in a library, museum or other institution where (subject to any provisions regulating the institution in question) it is open to public inspection,
the copyright in the work is not infringed by a person who reproduces the work for purposes of research or private study, or with a view to publication.
(7) Where a published literary, dramatic or musical work (in this subsection referred to as “the new work”) incorporates the whole or part of a work (in this subsection referred to as “the old work”) in the case of which the circumstances specified in the last preceding subsection existed immediately before the new work was published, and—