Video slice and active region based dual partial encryption

A method of partially dual encrypting a digital video signal, comprising:

• examining unencrypted packets of data in the digital video signal to identify at least one specified packet type, the at least one specified packet type comprising a packet carrying data representing an active region of a video frame;
• encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets;
• encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets;
• and
• replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal.

A method of partially dual encrypting a digital video signal, comprising:

• examining unencrypted packets of data in the digital video signal to identify at least one specified packet type;
• encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets;
• encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets;
• and
• replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal;
• wherein, the at least one selected packet type comprises at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data representing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data.

A selective encryption encoder, comprising:

• a packet identifier that identifies packets of at least one specified packet type;
• a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets;
• means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;
• a secondary encrypter for encrypting the second set of identified packets under a second encryption method;
• and
• wherein the packet identifier identifies packets of at least one of the following specified types:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data representing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data.

A selective encryption encoder, comprising:

• a packet identifier that identifies packets of at least one specified packet type, the at least one specified packet type comprising a packet carrying data representing an active region of a video frame;
• a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets;
• means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;
• a secondary encrypter for encrypting the second set of identified packets under a second encryption method.

A selective encryption encoder, comprising:

• a packet identifier that identifies packets of at least one specified packet type, the at least one specified packet type comprising packets containing a video slice header;
• a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets;
• means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;
• a secondary encrypter for encrypting the second set of identified packets under a second encryption method.

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 are of at least one selected packet type and the at least one selected packet type comprises at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data describing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• a decrypter that decrypts the 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 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 certain of the encrypted packets carry data describing an active region of a video frame;
• a decrypter that decrypts the 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 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 certain of the encrypted packets carry a video slice header;
• a decrypter that decrypts the 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 selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising:

• a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data representing an active region of a video frame;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets;
• a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.

A selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising:

• a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry a video slice header;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets;
• a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.

A selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising:

• a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data describing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets;
• a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.

A method of decrypting and decoding a selectively encrypted digital video signal, comprising:

• receiving packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data describing an active region of a video frame;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• decrypting the encrypted packets having the second PID to produce decrypted packets;
• remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• decoding the unencrypted and decrypted packets to produce a decoded video signal.

A method of decrypting and decoding a selectively encrypted digital video signal, comprising:

• receiving packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry a video slice header;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• decrypting the encrypted packets having the second PID to produce decrypted packets;
• remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• decoding the unencrypted and decrypted packets to produce a decoded video signal.

A method of decrypting and decoding a selectively encrypted digital video signal, comprising:

• receiving packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data describing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• decrypting the encrypted packets having the second PID to produce decrypted packets;
• remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• decoding the unencrypted and decrypted packets to produce a decoded video signal.

A computer readable medium that carries instructions that when executes on a programmed processor to facilitate operation of a video receiver device to decrypt and decode a selectively encoded digital video signal wherein the instructions comprise:

• a code segment that controls a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data describing an active region of a video frame, the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a code segment that controls decryption of the encrypted packets to produce decrypted packets;
• a code segment that controls remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a code segment that controls decoding the unencrypted and decrypted packets to produce a decoded video signal.

A computer readable medium that carries instructions that when executes on a programmed processor to facilitate operation of a video receiver device to decrypt and decode a selectively encoded digital video signal wherein the instructions comprise:

• a code segment that controls a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry a video slice header, the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a code segment that controls decryption of the encrypted packets to produce decrypted packets;
• a code segment that controls remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a code segment that controls decoding the unencrypted and decrypted packets to produce a decoded video signal.

A computer readable medium that carries instructions that when executes on a programmed processor to facilitate operation of a video receiver device to decrypt and decode a selectively encoded digital video signal wherein the instructions comprise:

• a code segment that controls a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data describing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
• a code segment that controls decryption of the encrypted packets to produce decrypted packets;
• a code segment that controls remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID;
• and
• a code segment that controls decoding the unencrypted and decrypted packets to produce a decoded video signal.

A selectively encrypted digital video signal embodied in a carrier wave, comprising:

• a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;
• certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry a video slice header;
• a first segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a second segment of code that identifies the encrypted packets by a second packet identifier (PID).

A selectively encrypted digital video signal embodied in a carrier wave, comprising:

• a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;
• certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data representing an active region of a video frame;
• a first segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a second segment of code that identifies the encrypted packets by a second packet identifier (PID).

A selectively encrypted digital video signal embodied in a carrier wave, comprising:

• a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;
• certain of the packets being unencrypted and certain of the packets being encrypted, wherein the encrypted packets are of at least one selected packet type and the at least one selected packet type comprises at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data representing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• a first segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a second segment of code that identifies the encrypted packets by a second packet identifier (PID).

A selectively encrypted digital video signal embodied in a computer readable medium, comprising:

• a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;
• wherein certain of the packets are unencrypted;
• wherein certain of the packets have been produced by decrypting encrypted packets;
• wherein certain of the decrypted packets carry a video slice header;
• and
• a segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a segment of code that identifies the encrypted packets by a second packet identifier (PID).

A selectively encrypted digital video signal embodied in a computer readable medium, comprising:

• a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;
• wherein certain of the packets are unencrypted;
• wherein certain of the packets have been produced by decrypting encrypted packets;
• wherein certain of the encrypted packets carry data representing an active region of a video frame;
• and
• a segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a segment of code that identifies the encrypted packets by a second packet identifier (PID).

A selectively encrypted digital video signal embodied in a computer readable medium, comprising:

• a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;
• wherein certain of the packets are unencrypted;
• wherein certain of the packets have been produced by decrypting encrypted packets;
• wherein certain of the decrypted packets carry certain of the packets being unencrypted and certain of the packets being encrypted, wherein the encrypted packets are of at least one selected packet type and the at least one selected packet type comprises at least one of the following:
• packets containing a video slice header appearing in an active region of a video frame, any packet carrying data representing an active region of a video frame, I Frame packets, packets containing motion vectors in a first P frame following an I Frame, packets having an intra_slice_flag indicator set, packets having an intra_slice indicator set, packets containing an intra_coded macroblock, packets that carry data for a slice containing an intra_coded macroblock, packets containing data from a first macroblock following the video slice header, packets containing video slice headers, packets containing anchor data, and P Frame packets for progressively refreshed video data;
• and
• a segment of code that identifies the unencrypted packets by a first packet identifier (PID);
• and
• a segment of code that identifies the encrypted packets by a second packet identifier (PID).