Cable TV - Variable Line Delay

This technique introduces various line delays into some of the lines of video signal on a pseudo-random basis, and the encryption signal tells the descrambler to switch in various line delays to correspond with the transmitted signal. Properly controlled, this system can be very effective, giving rise to pictures that are just recognizable but very poor definition.

Changes have now been made to the way in which the delays are implemented, which make the system far less open to abuse, such as the case was in France.

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