 Events distributed through PPV typically include combat sports events such as boxing and mixed martial arts (focusing primarily on cards that include one or more significant title fights), sports entertainment such as professional wrestling, and concerts.In the past, PPV was often used to distribute telecasts of feature films, as well as adult content such as pornographic films, but the growth of digital cable and streaming media caused these use cases to be subsumed by video on demand systems (which allow viewers to purchase and view pre-recorded content at any time) instead, leaving PPV to focus primarily on live event programs.The earliest form of pay-per-view was closed-circuit television, also known as theatre television, where professional boxing telecasts were broadcast live to a select a number of venues, mostly theaters, where viewers paid for tickets to watch the fight live.