Pursuant to article 1 of the WCT the contracting parties shall comply with article 1 to 21 of the berne convention ilke the TRIPS agreement the WCT not only requires its contracting parties to comply with article 9 of the berne convention by refeernce but also reiterates the words of article 9(2) again in its article 10 so that contracting parties may provide for national exceppions to the rights granted to authors of the works under the WCT, but that such exceptions shall never the less be subject to the control of the three-step test embodied in Article 10