BBC Television Ceefax, the first teletext service, launched on 23 September 1974. This service allowed BBC viewers to view textual information such as the latest news on their television. CEEFAX did not make a full transition to digital television, instead being gradually replaced by the new interactive BBCi service before being fully closed down on 22 October 2012. In March 2003 the BBC announced that from the end of May 2003 (subsequently deferred to 14 July) it intended to transmit all eight of its domestic television channels (including the 15 regional variations of BBC 1) unencrypted from the Astra 2D satellite. This
Teletext systems mounted a large market trial in Los Angeles in partnership with NBC and Public Broadcasting Service (PBS) Public television. Services premiered simultaneously on station KNXT (now KCBS-TV), KNBC and KCET in Los Angeles. All three services included an array of local news and information services. KCET's service also included service components for use in schools. Later, an official North American standard of teletext, called NABTS (North American Broadcast Teletext Specification) was developed in the early 1980s by Norpak, a Canadian company. NABTS provided improved graphic and text capability over WST, but was quite short-lived. This was mainly due to the