A major South African retailer and the organizer of a large national event wanted to identify specific loyalty customers who took part in the event. The objective was to re-activate their participation in the event for the coming year. The retailer and event organizer could overlay their data and identify the target loyalty customers without sharing the personal information of the consumers concerned with each other in the process. The event organiser also did not get access to any of the retailer’s data in the process, which meant the retailer could protect their IP.