Berne Convention states were concerned that the existence of the UCC would encourage parties to the Berne Convention to leave that convention and adopt the UCC instead. So the UCC included a clause stating that parties which were also Berne Convention parties need not apply the provisions of the Convention to any former Berne Convention state that renounced the Berne Convention after 1951. Thus, any state that has once adopted the Berne Convention is penalised if it then decides to renounce the Berne Convention and use the UCC protections instead, as its copyrights might no longer exist in Berne Convention states.