proponents believe that copyright encourages progress in the arts. with an extension of copyright, future artists have to create something original, rather than reuse old work, however, had the act been in place in the 1960s, it is unlikely that andy warhol would have been able to sell or even exhibit any of his work, since it all incorporated previously copyrighted material. proponents contend that it is more important to encourage all creators to make new works instead of just copyright holders.