San Diego-based Verimatrix, a developer of DRM software used in IPTV and set top boxes, said today that it has added New Zealand telecom TelstraClear Ltd. as a customer. Verimatrix said that TelstraClear will be using its Video Content Authority System (VCAS) for DVB product, to secure its pay TV services. Financial impact of the win was not disclosed. Verimatrix said that TelstraClear is the second-largest full service telecommunications company in New Zealand.