HBO was the first cable network to originate as a non-terrestrial broadcast TV network. HBO went on the air in 1965 and was originally transmitted via terrestrial microwave towers. In 1976, HBO became the first TV network to broadcast its signals via satellite when it showed the "Thrilla From Manila" boxing match between Muhammad Ali and Joe Frazier. In 1986, HBO also became the first satellite network to encrypt its signal from unauthorized viewing. Later, HBO was one of the first cable TV networks to broadcast an HDTV version of its channel.
HBO is currently owned by AOL Time Warner.
See also: HBO Latino.