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Video Encryption is a method of preventing a video signal from being viewed unless you have the ability to decode the signal. Older methods dropped the video interlace which caused a picture to roll or skew. Newer methods change the video image so that it is scrambled and unreadable unless processed with the decryption key. Since the signal must be decrypted on each frame, this has to be done 60 times per second (in the U.S.) and 50 times per second (in Europe). This requires hardware decoding because software cannot decode the entire picture image fast enough.

Satellite Television providers typically use two methods: they change the encryption key on a regular basis, and they send a disable signal to a receiver device when the subscription ends, which invalidates its stored keys and it can't read the signals.

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13y ago

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