Smith-Kline Beecham (second respondent) marketed Augmentin, a medicine consisting of amoxycillin and potassium clavulanate, registered under the Medicines and Related Substances Control Act 101 of 1965. Dr Kritzinger, Smith-Kline Beecham's medical director, prepared a package insert for the medicine, which was required for registration purposes. The insert was compiled using skill and judgment, drawing from various data sheets prepared by Beecham Group PLC (first respondent, the parent company), with original language and synopses prepared by Dr Kritzinger and his staff. The insert underwent a lengthy approval process with the Medicines Control Council (MCC) during 1980-1982, with various amendments and discussions, until final approval was obtained. After the patents on Augmentin lapsed, Biotech Laboratories (appellant) applied to register the same chemical composition under the name Bio-Amoksoklav. At the MCC's behest, Biotech copied Smith-Kline Beecham's package insert substantially and obtained registration. Biotech sold its product with this copied package insert. Smith-Kline Beecham obtained an interdict in the court below (per Swart J) restraining Biotech from infringing its copyright. Biotech appealed.