Teletext systems the country being closed captioning, TV Guide On Screen, and Extended Data Services (XDS). A version of the European teletext standard designed to work with the NTSC television standard used in North America was first demonstrated in the US in 1978 by station KSL in Salt Lake City, Utah, premiered a teletext service using Ceefax. They were followed by American television network CBS, which decided to try both the British Ceefax and French Antiope software for preliminary tryouts for a teletext service, using station KMOX (now KMOV) in St. Louis, Missouri as a testing ground. CBS decided on Antiope and
Teletext Ltd. requiring the holder to provide the licensed service throughout the licence period. In accepting a licence, the broadcaster takes account of the likely cost of the obligations under the licence, and the value of the benefits associated with the licence, for the duration of the licence period." Teletext’s licence was for the licence period 2004 to 2014. The main Teletext service on Freeview was removed from channel 100 on the EPG on 21 June 2010. Teletext Holidays went digital in January 2011. In a deal between BBC Worldwide and Inview Technology Ltd, Teletext Extra was relaunched as Radio Times Extra