Fair Use of Copyrighted Materials
  1. Commercial use is less likely to be considered fair use than non-profit.
  2. Criticism, commentary and parody is considered fair use.
  3. Uses of factual, published and out of print works are more likely considered fair than unpublished or creative materials.
  4. If you use large amounts of the document, it is less likely to be considered fair. Small, non-central parts are more likely to be considered fair.
  5. The higher the potential value of the market for the work, the less likely its use can be considered fair. Out-of-print materials and materials that have no commercial market are more likely to be considered fair use.

Source: Cohen and Rosenzweig, _Digital History_ [http://chnm.gmu.edu/digitalhistory/copyright/5.php]

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