A method and apparatus for the transmission and reception of scrambled data is disclosed. In some embodiments, the method and apparatus includes transmitting a scrambled data stream to a decoder, sending the scrambled data stream to a portable security module inserted in the decoder, descrambling the...http://www.google.es/patents/US6286103?utm_source=gb-gplus-sharePatente US6286103 - Method and apparatus for encrypted data stream transmission
Method and apparatus for encrypted data stream transmission
