In December 2004, the appellant (Zietsman) instituted action against the respondents for alleged infringement of his South African patent number 92/9925. The respondents brought a first application for security for costs which was granted by the Commissioner of Patents. Zietsman appealed successfully to the SCA, which dismissed the respondents' application on the basis that they had not disclosed a defence and had not tendered evidence relating to their prospects of success in the main action (reported as Zietsman v Electronic Media Network Ltd 2008 (4) SA 1 (SCA)). On 10 June 2008, the respondents made a second request for security for costs, this time including statements about their prospects of success in defending the main action. The appellant refused and the respondents launched a second application on 28 August 2008. The Commissioner of Patents (Sapire AJ) ordered Zietsman to furnish security for costs in the amount of R100,000. The appellant appealed, arguing that the second application was barred by res judicata or issue estoppel.