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http://fairuse.stanford.edu/rice.html
I. Fair Use for Teaching and Research
The "fair use" doctrine allows limited reproduction of copyrighted works for educational and research purposes. The relevant portion of the copyright statue provides that the "fair use" of a copyrighted work, including reproduction "for purposes such as criticism, news reporting, teaching (including multiple copies for classroom use), scholarship, or research" is not an infringement of copyright. The law lists the following factors as the ones to be evaluated in determining whether a particular use of a copyrighted work is a permitted "fair use," rather than an infringement of the copyright:
the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
the nature of the copyrighted work;
the amount and substantiality of the portion used in relation to the copyrighted work as a whole, and
the effect of the use upon the potential market for or value of the copyrighted work.
Although all of these factors will be considered, the last factor is the most important in determining whether a particular use is "fair." Where a work is available for purchase or license from the copyright owner in the medium or format desired, copying of all or a significant portion of the work in lieu of purchasing or licensing a sufficient number of "authorized" copies would be presumptively unfair. Where only a small portion of a work is to be copied and the work would not be used if purchase or licensing of a sufficient number of authorized copies were required, the intended use is more likely to be found to be fair.
I think the idea of "fair use" will allow you to use scanned photos as a reference material for teaching without necessity to license the work.
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look! its a signature!
(This message has been edited by Patrick (edited 05-08-2003).)