Critical packet partial encryption

A method of encrypting a digital television signal, comprising:

• examining unencrypted packets of data in the digital television signal to identify a portion of the packets that are of a packet type while other unencrypted packets in the digital television signal are not of the packet type;
• encrypting packets identified as being of the packet type using a first encryption method to produce first encrypted packets;
• encrypting the packets identified as being of the packet type using a second encryption method to produce second encrypted packets;
• replacing the unencrypted packets of the packet type with the first encrypted packets and the second encrypted packets in the digital television signal to produce a partially multiple encrypted television signal comprising the other unencrypted packets and the first and second encrypted packets;
• and
• distributing the multiple partially encrypted digital television signal.

A method of encrypting a digital television signal, comprising:

• examining packets of data in the digital television signal to identify a portion of the packets that are of a packet type while other unencrypted in the television signal are not of the packet type;
• encrypting packets identified as being of a packet type using a first encryption method to produce first encrypted packets;
• encrypting packets identified as being of a packet type using a second encryption method to produce first encrypted packets;
• and
• distributing the digital television signal with first and second encrypted packets of the packet type along other packets that are unencrypted.

A television set-top box, comprising:

• a receiver receiving a digital television signal comprising:
• a plurality of unencrypted packets;
• and
• a plurality of encrypted packets, wherein the encrypted packets comprises at least a first encrypted packet encrypted under first encrypted method and a second encrypted under a second encryption method, and wherein the encrypted packets contain information required to decode the digital television signal;
• a decrypter that decrypts either packets encrypted under the first or the second encryption method to produce decrypted packets;
• and
• a decoder that decodes the unencrypted packets and the decrypted packets to produce a signal suitable for play on a television set.

A method of decoding a multiple partially encrypted television signal, comprising:

• receiving a digital television signal comprising a plurality of packets, wherein certain packets of the plurality of packets are encrypted packets, wherein the packets comprise at least a first encrypted packet encrypted under first encryption method and a second encrypted packets encrypted under a second encryption method, and a remainder of the packets are unencrypted, wherein the encrypted packets contain information that is required for correct decoding of the television signal;
• decrypting a packet encrypted under one of the first and second encryption methods to produce decrypted packets;
• and
• decoding the decrypted packets and the unencrypted packets to produce a decoded television signal that can be displayed on a display on a display device.

A method of decoding a partially encrypted television program, comprising:

• receiving the partially encrypted television program comprising a plurality of clear packets, a plurality of packets encrypted under a first encryption algorithm, and a plurality of packets encrypted under a second encryption algorithm;
• wherein the packets encrypted under the first and second encryption algorithms are packets that are needed for proper decoding of the television program;
• decrypting the packets encrypted under the first encryption algorithm to produce decrypted packets;
• and
• decoding the decrypted packets and the clear packets for display on a display device.

A method of decrypting a partially encrypted television program, comprising:

• receiving the partially encrypted television program comprising a plurality of clear packets, a plurality of packets encrypted under a first encryption algorithm, and a plurality of packets encrypted under a second encryption algorithm;
• wherein the packets encrypted under the first and second encryption algorithms are packets that are needed to properly decode the television program;
• wherein the clear packets are identified by a first packet identifier;
• wherein the packets encrypted under the first encryption algorithm are identified by a second packet identifier (PID), and wherein the packets encrypted under the second encryption algorithm are identified by a third packet identifier (PID);
• and
• decrypting the packets encrypted under the first encryption algorithm to produce decrypted packets of data to permit information to be display on a video display device.

A method of multiple partial encrypting a packetized stream of information, comprising:

• examining packets of data in the stream of information to identify a packet type, wherein the packet type is needed to decode the data stream;
• duplicate packets identified as being of a packet type to create first and second duplicate packets;
• at a first encrypting device, encrypting the first duplicate packets according to a first encryption method to create first encrypted packets;
• at a second encryption device, encrypting the second method duplicate packets according to a second encryption method to create second encrypted packets;
• and
• sending the first and second encrypted packets along with packets of the data in the stream of information that are not of the identified packet type to a recipient.

A method of manipulating packetized digital content comprising:

• examining unencrypted packets to identify a packet type;
• duplicating the packets identified as being of the packet type to produce first and second duplicate packets;
• and
• inserting the first and second duplicate packets into the digital content to produce partially duplicated content having first and second duplicate packets instead of the identified packets.

A method of manipulating packetized digital content, comprising:

• examining unencrypted packets to identify a packet type;
• duplicating the packets identified as being of the packet type to produce first and second duplicate packets;
• encrypting the first and second duplicate packets;
• and
• inserting the first and second encrypted packets into the digital content to produce partially encrypted content.

A method of manipulating packetized digital content, comprising:

• examining unencrypted packets to identify a packet type;
• duplicating the packets identified as being of the packet type to produce first and second duplicate packets;
• encrypting the first duplicate packets under a first encryption method;
• encrypting the second duplicate packets under a second encryption method;
• and
• inserting the encrypted first duplicate packets and encrypted second duplicate packets into the digital content to produce partially encrypted content.

A method of allowing multiple conditional access providers in a content delivery system, comprising:

• examining unencrypted packets of content to identify a portion of packets that are of a packet type while other packets in the content are not of the packet type;
• encrypting packets of the type using a first encryption method used by a first conditional access provider to produce first encrypted packets;
• encrypting packets of the packet type using a second encryption method used by a second conditional access provider to produce first encrypted packets;
• replacing the packets of the packet type with the first and second encrypted packets to produce partially dual encrypted content comprising the other packet and the first and second encrypted packets;
• and
• distributing the partially dual encrypted content in the content delivery system.

A television receiver device, comprising:

• a receiver receiving a digital television signal comprising:
• a plurality of unencrypted packets;
• and
• a plurality of encrypted packets, wherein the encrypted packets comprise at least first encrypted packets encrypted under first encryption method and second encrypted packets encrypted under a second encryption method, and wherein the encrypted packets contain information used to decode the digital television signal;
• a decrypter that decrypts at least one of the first and second encrypted packets;
• and
• a decoder that decodes the unencrypted packets and the decrypted packets to produce a signal suitable for play on a television set.

A method of detecting and decrypting multiple carriage signals, wherein each carriage is partially encrypted, comprising:

• receiving partially multiple encrypted content comprising unencrypted content, and content encrypted under both a first encryption system and a second encryption system;
• detecting encrypted portions of the partially multiple encrypted content encrypted under the first encryption system;
• and
• decrypting the encrypted content encrypted under the first encryption system to produce decrypted content suitable for display on a video display device.

An apparatus for detecting and decrypting multiple carriage signals, wherein each carriage is partially encrypted, comprising:

• means for receiving partially multiple encrypted content comprising unencrypted content, and content encrypted under both a first encryption system and a second encryption system;
• mean for detecting encrypted portions of the partially multiple encrypted content encrypted under the first encryption system;
• and
• means for decrypting the encrypted content encrypted under the first encryption system to produce decrypted content that permits information to be displayed on a video display device.

A television set-top box, comprising:

• means for receiving a partially multiple encrypted digital television signal comprising:
• a plurality of unencrypted packets;
• and
• a plurality of encrypted packets, wherein the encrypted packets comprise at least first encrypted packets encrypted under first encryption method and second encrypted packets encrypted under a second encryption method, and wherein the encrypted packets contain information required to decode the digital television signal;
• means for decrypting at least one of the first and second encrypted packets;
• and
• means for decoding the unencrypted packets and the decrypted packets to produce a signal suitable for play on a television set.

A television set-top box for detecting multiple carriage signals and decrypting based upon detection, comprising:

• means for receiving a partially multiple encrypted digital television signal comprising:
• a plurality of unencrypted packets;
• and
• a plurality of encrypted packets, wherein the encrypted packets comprise at least first encrypted packets encrypted under first encryption method and second encrypted packets encrypted under a second encryption method, and wherein the encrypted packets contain information used to decode the digital television signal;
• means for detecting encrypted portions of the partially multiple encrypted digital television signal encrypted under the first encryption method;
• and
• means for decrypting at least one the first and second encrypted packets to permit the digital television signal to be displayed on a video display device.

A television set-top box for detecting multiple carriage signals and decrypting based upon detection, comprising:

• a receiver receiving a digital television signal comprising:
• a plurality of unencrypted packets;
• and
• a plurality of encrypted packets, wherein the encrypted packets comprise at least a first encrypted packet encrypted under first encryption method and a second encrypted packet encrypted under a second encryption method, and wherein the encrypted packets contain information used to decode the digital television signal;
• and
• a decrypter that decrypts at least one the first and second encrypted packets to permit the digital television signal to be displayed on a video display device.

A method of multiple carriage encryption, comprising:

• examining unencrypted packets of data in the digital television signal to identify a portion of the packets that are of a packet type while other unencrypted packets in the digital television signal are not of the packet type;
• duplicating packets identified as being of the packet type to create first and second duplicate packets;
• encrypting the first duplicate packets according to a first encryption method to create first encrypted packets;
• encrypting the second duplicate packets according to a second encryption method to create second encrypted packets;
• and
• replacing the unencrypted packets of the packet type with the first and second encrypted packets in the digital television signal to produce a multiple partially encrypted digital television signal comprising the other unencrypted packets and the first and second encrypted packets.