Pay-per-view
The first pay-per-view system tested in the United states was the Zenith Phonevision system.  In 1949, it used telephone lines to take and receive orders. The telephone lines were also used to descramble the signal on the television.  Tests were run for 90 days in Chicago.  In 1950, Skiatron tested its system on WOR in New York City.  The system used IBM punch cards to descramble the signal.  Both systems showed that they could be used but were not allowed to be used by the FCC.