Derivative
Under copyright law, the copyrght holder has rights to all derivatives of the registered copyright.

For a work to be considered a derivative work the work must first contain originality and second, be made lawfully as described under 17 U.S.C. § 103(a). The term "lawfully" refers to permission granted by the true copyright owner.

The standard which courts have used in determining the amount of originality needed for a work to be considered a derivative work has been that the derivative work must make a variation on an underlying work that is considered more than "merely trivial."

The Second Circuit's Durham test, which holds that to support a copyright, the original aspects of a derivative work: (1) must be more than trivial; and (2) must reflect the degree to which the derivative work relies on preexisting material and must not in any way affect the scope of any copyright protection in that preexisting material. A derivative must be copyrightable.