Under the Copyright laws, a "derivative work" is a work based upon one or more preexisting works. Copyright protection extends to derivative works. Any "alteration" must only be inspired by the original work and should not be substantially similar to that work.
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Philip Braginsky - Sills Cummis and Gross
http://www.sillscummis.com/practice/practice_group.asp?id=28
Answered on Nov 17th, 2011 at 12:45 PM