Other techniques such as adding an interfering signal to the video or audio began to be used as the simple filter solutions were easily bypassed. As the number of television channels on these cable networks grew, the filter-based approach became increasingly impractical. These filters would be added or removed according to the subscription. The most common of these was a channel-based filter that would effectively stop the channel being received by those who had not subscribed. The early Pay TV systems for cable television were based on a number of simple measures. Consequently, some methods were developed to frustrate these self-connectors. This led to problems with people connecting to the network without paying. The early cable-based Pay TV networks used no security. The prevention of piracy on cable and satellite networks has been one of the main factors in the development of Pay TV encryption systems. Pay television exists to make revenue from subscribers, and sometimes those subscribers do not pay. 2.2 Digital cable and satellite television encryption.2.1 Cable and early satellite television encryption.
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