10 Originally Butt's claim for relief by way of interdict was based on passing off and "unlawful compe¬ tition and for unlawful interference with my trade." In January 1984 leave was granted to Butt to supplement his founding affidavit,and to amend the notice of motion so as to claim relief for breach of copyright in the ButtCat hull . In his answering affidavit Schultz admitted that he had used the Butt-Cat hull which he had obtained from Beary to construct from it a mould which he used to create hulls for boats which he named "Supercats". He claimed, however, hull, ploying spending labour that he and 600 had materials man made hours modifications which "re-working" he valued to Judgment the itatand Butt-Cat R16000. em¬