From Lee v. ART Co., 125 F. 3d 580 - Court of Appeals, 7th Circuit 1997:
"Derivative work" is a defined term:
A "derivative work" is a work based upon one or more preexisting works, such as a translation, musical arrangement, dramatization,
fictionalization, motion picture version, sound recording, art reproduction, abridgment, condensation, or any other form in which a
work may be recast, transformed, or adapted. A work consisting of editorial revisions, annotations, elaborations, or other modifications
which, as a whole, represent an original work of authorship, is a "derivative work."
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