12 of a plug would still be the vital starting point of the construction process. The using of applicant's hull as a plug from which to com¬ mence his construction process, and thereby avoiding the necessity to design his own hull, amounts in my view to unfair competition, against which applicant is entitled to be protected." The learned judge found further that Schultz's conduct in using a Butt-Cat hull in order to produce hulls, whether or not with the adaptations or modifications effected by him, constituted an infringement of the copyright which Butt had in the Butt-Cat plug, moulds and hull. He also found in Butt's favour in respect of the claim for cancel¬ lation of the registration of Designs Nos 83/0645 and 83/0647 The cause of action based on passing off was abandoned