Copyright in Derivative Works and Compilations in the U.S. (copyright.gov)
A derivative work is a work based on or derived from one or more already existing works. Common derivative works include translations, musical arrangements, motion picture versions of literary material or plays, art reproductions, abridgments, and condensations of preexisting works. Another common type of derivative work is a “new edition” of a preexisting work in which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work.
To be copyrightable, a derivative work must incorporate some or all of a
preexisting “work” and add new original copyrightable authorship to that work.
The derivative work right is often referred to as the adaptation right.