other network competition. Channel 7 had its call letters changed to WLS-TV on October 7, 1968, named after WLS Radio, which ABC had wholly owned since 1959 when the network bought the 50% interest it did not already hold in the station from the Prairie Farmer magazine. Ironically, ABC merged WLS with WENR, its shared-time partner, in 1954. In 1963, Al Parker joined the station as an announcer and worked in that capacity for 26 years. Until his departure, he also served as an announcer for AM Chicago and The Oprah Winfrey Show. He died September 30, 2000, at the age of 74. WLS-TV had claimed to be "Chicago's first television station" in its sign-ons and sign-offs during its first three decades (implying a connection with the original WBKB on channel 4), but admitted to its true roots with WENR with its 30th anniversary in 1978. On January 17, 1984, WLS-TV launched Tele1st, an ABC-owned overnight subscription television service that carried a mix of films and lifestyle programs for four hours per night six days a week after the station's sign-off at 2:00 a.m.; the service was similar in format to competitor ONTV (which was carried locally on WSNS-TV, channel 44 (now a Telemundo owned and operated station)) and other over-the-air pay services that existed during the early and mid-1980s. Tele1st was created with the concept of allowing users to record programming for later viewing; therefore, its decoder boxes were designed to unencrypt the signal only with the aid of a VCR. Scrambling codes that were sent to the box and relayed to the VCR were changed on a monthly basis, requiring subscribers to record additional footage airing immediately before and after that night's schedule to retrieve codes to play back the recorded programs properly; this resulted in any recordings being viewable only during that calendar month. Tele1st was deemed a failure, attributing only 4,000 subscribers at its peak, and ceased operations on June 30, 1984. In 1988, WLS-TV agreed to sell production rights to The Oprah Winfrey Show to her Harpo Productions company, but ABC O&Os continued to air the show until the end of its run in 2011. Programming WLS-TV currently airs the Litton's Weekend Adventure educational programming block and the network's political/news discussion program This Week one hour later than most ABC stations due to its weekend morning newscasts. , syndicated programs broadcast on WLS-TV include Live