A computer program which contains code from a licensed product. A FORTRAN program that you wrote that calls a library routine that you bought is a derivative work of the library software.
creative adaptations of original work
works that are generated from another form of the same work.
That term as used in this License is defined under Dutch copyright law. (See Section 1(b))
a work based on another work. A derivative must be different from the original and contain new additions (minor changes are not sufficient). Examples include translations, musical arrangements, dramatizations, fictionalizations, art reproductions, and condensations. Copyright permission must be obtained before producing derivative works. Derivative works can be copyrighted independent of the original work.