Among the most popular coding systems often appear BISS (Essential Interoperable Scrambling System), SECA / Mediaguard (www.canalplus-technologies.com), Irdeto (www.irdetoaccess.com), Betacrypt (www.betaresearch.de), Conax, Cryptoworks (www.cryptoworks.com), Viaccess, NDS / Videoguard (www.nds.com) and NagraVision (www.nagra.com). Almost all of these systems have been developed by European firms. Some of them are broken and are available for viewing in the presence of fresh keys.
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TV encryption, regularly alluded to as "scrambling", is encryption used to control, access to pay TV channel, or satellite TV channel . Some scrambled channels can be watched with the introduction of satellite keys.