Hbo is a high expense special channel that shows new movies or
older movies that were good (unlike some "b" rated or boring
movies).
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Cinemax was created in 1980.
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Cinemax (and HBO) are owned by Time Warner.
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After Dark on Cinemax is a programming block that focuses on
adult oriented entertainment. Many of the series featured within
this block are exclusive to Cinemax.