 The system used IBM punch cards to descramble a signal broadcast during the broadcast station's "off-time".Both systems showed promise, but the Federal Communications Commission denied them the permits to operate.One of the earliest pay-per-view systems on cable television, the Optical Systems-developed Channel 100, first began service in 1972 in San Diego, California through Mission Cable (which was later acquired by Cox Communications) and TheaterVisioN, which operated out of Sarasota, Florida.