System and method for partially encrypted multimedia stream

System and method for partially encrypted multimedia stream

  • CN 102,045,590 A
  • Filed: 03/08/2004
  • Published: 05/04/2011
  • Est. Priority Date: 03/31/2003
  • Status: Active Application
First Claim
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1. method that is used for multimedia transmission comprises:

  • Generate the copy of media stream, so that first and second non-encrypted streams with identical predetermined portions to be provided;

    Send first non-encrypted stream and insert (CA) assembly (20), encrypting whole first non-encrypted stream, thereby provide complete encryption stream to first condition;

    From described complete encryption stream, obtain the encryption version of described predetermined portions;

    Use second non-encrypted stream, utilize the 2nd CA assembly (24) to encrypt described predetermined portions, so that local cypher stream to be provided;

    AndThe encryption predetermined portions that will obtain from described complete encryption stream is inserted in the described local cypher stream, so that its transmission.

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