Pay tv

Pay television, subscription television, premium television, or premium channels are subscription-based television services, usually provided by both analog and digital cable and satellite television, but also increasingly via digital terrestrial and internet television. Subscription television began in the multi-channel transition and transitioned into the post-network era. Some parts of the world, notably in France and the United States, have also offered encrypted analog terrestrial signals available for subscription.

Subscription-based or pay television has resulted in a change in what type of content is broadcast by these networks. This model has led to networks creating much more specialized types of shows to influence viewers to subscribe. Subscription networks are most concerned with providing content that will make people want to subscribe as well as renew subscriptions rather than who is watching and when this viewing is taking place.

Due to the unedited nature of premium services, it is typical for them to showcase programming that includes large amounts of profanity, sexual activity and nudity, graphic violence and other adult content (the inclusion of any such content depends on the program, as services may also include content that is at least partially, if not entirely, devoid of material that may be inappropriate for some viewers). To notify viewers of program content, most premium channels air advisory bumpers immediately before each program, mentioning the program's rating (this typically does not apply to live sporting events) and program content information. Since the 1990s, premium channels in the United States use content descriptors that describe potentially objectionable content included in the program, such as mild violence (identified as "MV") or strong sexual content (identified as "SSC"); additional features included in the television program such as closed captioning and surround sound functions, and alternate-language audio tracks via secondary audio program feeds may also be mentioned.

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