Although the new song was deemed a parody in this case, not all humorous commentaries of copyrighted works are permissible under US copyright law. One must clearly traverse the four fair use factors in order to create a successful parody argument. As to copyright owners of well-known works, according to the Bourne case they apparently "must expect, or at least tolerate, a parodist's deflating ridicule," as such deflating uses "serve the important social function of shedding light on the earlier work."
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