Patent ID: 7286667

Claim:
A method of decoding a selectively encrypted data stream at a digital television receiver device, comprising: at the digital television receiver device, receiving the selectively encrypted data stream from a first source; at the digital television receiver device, receiving a set of clear packets from a second source, the set of clear packets containing data representing an unencrypted version of the encrypted packets present in the selectively encrypted data stream; detecting a plurality of encrypted packets forming a part of the selectively encrypted data stream; substituting the clear packets from the second source for the encrypted packets to form a clear data stream, such clear data stream thereby being produced without decryption of the encrypted packets present in the selectively encrypted data stream by the digital television receiver device; filtering a set of packets from the selectively encrypted data stream based upon packet identifier values to produce a stream of packets having clear packets and encrypted packets; and substituting the clear packets from the second source for the encrypted packets into the stream of packets in place of the encrypted packets to produce a stream of clear data.