howard besser questioned the proponents' argument that "new works would not be created", which implies that the goal of copyright is to make the creation of new works possible. however, the framers of the united states constitution evidently thought that unnecessary, instead restricting the goal of copyright to merely "promot[ing] the progress of science and useful arts". in fact, some works created under time-limited copyright would not be created under perpetual copyright because the creator of a distantly derivative work does not have the money and resources to find the owner of copyright in the original work and purchase a license, or the individual or privately held owner of copyright in the original work might refuse to license a use at any price (though a refusal to license may trigger a fair use safety valve). thus they argue that a rich, continually replenished, public domain is necessary for continued artistic creation.