(3) the amount and substantiality of the portion used in relation to the
copyrighted work as a whole; and

(4) the effect of the use upon the potential market for or value of the
copyrighted work.

The fact that a work is unpublished shall not itself bar a finding of
fair use if such finding is made upon consideration of all the above
factors.


Section 108. Limitations on exclusive rights: Reproduction by libraries
and archives [39]

(a) Except as otherwise provided in this title and notwithstanding the
provisions of section 106, it is not an infringement of copyright for a
library or archives, or any of its employees acting within the scope of
their employment, to reproduce no more than one copy or phonorecord of a
work, except as provided in subsections (b) and (c), or to distribute
such copy or phonorecord, under the conditions specified by this
section, if-

(1) the reproduction or distribution is made without any purpose of
direct or indirect commercial advantage;

(2) the collections of the library or archives are (i) open to the
public, or (ii) available not only to researchers affiliated with the
library or archives or with the institution of which it is a part, but
also to other persons doing research in a specialized field; and