Kudelski SA is a holding company which engages in the provision of digital security systems and solutions. It operates through the Integrated Digital Television and Public Access segments. The Integrated Digital Television segment offers open conditional access to digital operators and providers. The Public Access segment gives access to control systems and ticketing services such as car parks, stadiums, and concert halls. It distributes its products under the Nagra brand. The company was founded by Stefan Kudelski in 1951 and is headquartered in Cheseaux-sur-Lausanne, Switzerland.