To quote U.S. copyright law, section 107:
Notwithstanding the provisions of sections 106 and 106A, the fair use
of a copyrighted work, including such use by reproduction in copies or
phonorecords, or by any other means specified by that section, for
purposes such as criticism, comment, news reporting, teaching
(including multiple copies for classroom use), scholarship, or
research, is not an infringement of copyright. In determining whether
the use made of a work in any particular case is a fair use the
factors to be considered shall include:
1. the purpose and character of the use, including whether such use
is of a commercial nature or is for nonprofit educational purposes;
2. the nature of the copyrighted work;
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The fact that a work is unpublished shall not itself bar a finding of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 of the
above factors.
Tim Daly
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