If you are concerned about fair use -- and you should be if you are an educator, trainer, or other person who uses source materials in their work -- then it is worthwhile learning the basic outlines of the concept. <a href="http://en.wikipedia.org/wiki/Fair_use">http://en.wikipedia.org/wiki/Fair_use</a> In particular, there is an extensive list of common misunderstandings <a href="http://en.wikipedia.org/wiki/Fair_use#Common_misunderstandings,">http://en.wikipedia.org/wiki/Fair_use#Common_misunderstandings,</a> several of whic