Patent ID: 8243921
Filing Date: 2012-08-14
Classification: H04N

Abstract:
1. A method of generating a set of clear packets used to decode a selectively encrypted data stream, comprising: receiving a single selectively encrypted stream of data where the stream comprises both encrypted and non-encrypted packets within the single selectively encrypted stream of data, and where both the encrypted and non-encrypted packets are required to produce a descrambled video image when decoded; detecting a plurality of encrypted packets within the selectively encrypted stream of data; creating the set of clear packets by decrypting the plurality of encrypted packets detected within the selectively encrypted stream of data and discarding the non-encrypted packets; storing the set of clear packets as a computer file separate from the selectively encrypted stream of data; and providing the set of clear packets to a decoder that has access to a stream of selectively encrypted data that includes the selectively encrypted data stream so that the decoder produces the descrambled video image by combining the non-encrypted packets of the selectively encrypted data stream with the clear packets to recreate the selectively encrypted data stream in an unencrypted form.