Elementary bitstream cryptographic material transport systems and methods
First Claim
1. A method of playing back encrypted video on a playback device, where at least partially encrypted video data is contained within a container file and can be extracted and decrypted to create an elementary bitstream using cryptographic information, which can be used to decrypt the at least partially encrypted video data, the method comprising:
- extracting at least partially encrypted video data from a container file containing at least partially encrypted video data to create an at least partially encrypted elementary bitstream using a processor configured by a demultiplexer process;
obtaining cryptographic information using the processor configured by the demultiplexer process;
enciphering the cryptographic information using the processor configured by an upstream digital rights management component of the demultiplexer process;
inserting the enciphered cryptographic information into the at least partially encrypted elementary bitstream using the processor configured by the upstream digital rights management component of the demultiplexer process;
providing the at least partially encrypted elementary bitstream in which the enciphered cryptographic information is inserted to a video decoder process using the processor;
extracting the enciphered cryptographic information from the at least partially encrypted elementary bitstream using the processor configured by the video decoder process;
deciphering the enciphered cryptographic information using the processor configured by a downstream digital rights management component of the video decoder process;
decrypting the at least partially encrypted elementary bitstream with the cryptographic information using the processor configured by the downstream digital rights management component of the video decoder process; and
decoding the elementary bitstream for rendering on a display device using the processor configured by the video decoder process;
wherein the enciphering process and the deciphering process are synchronized such that a delay in excess of a predetermined time between enciphering and deciphering results in the cryptographic information being unrecoverable.
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Accused Products
Abstract
Systems and methods for providing multimedia content from one process or component to another process or component over an unsecured connection are provided. One embodiment includes obtaining the cryptographic information, extracting the at least partially encrypted video data from the container file to create an elementary bitstream, enciphering the cryptographic information, inserting the cryptographic information in the elementary bitstream, providing the elementary bitstream to a video decoder, extracting the cryptographic information from the elementary bitstream at the video decoder, deciphering the cryptographic information, decrypting the elementary bitstream with the cryptographic information and decoding the elementary bitstream for rendering on a display device using the video decoder.
50 Citations
24 Claims
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1. A method of playing back encrypted video on a playback device, where at least partially encrypted video data is contained within a container file and can be extracted and decrypted to create an elementary bitstream using cryptographic information, which can be used to decrypt the at least partially encrypted video data, the method comprising:
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extracting at least partially encrypted video data from a container file containing at least partially encrypted video data to create an at least partially encrypted elementary bitstream using a processor configured by a demultiplexer process; obtaining cryptographic information using the processor configured by the demultiplexer process; enciphering the cryptographic information using the processor configured by an upstream digital rights management component of the demultiplexer process; inserting the enciphered cryptographic information into the at least partially encrypted elementary bitstream using the processor configured by the upstream digital rights management component of the demultiplexer process; providing the at least partially encrypted elementary bitstream in which the enciphered cryptographic information is inserted to a video decoder process using the processor; extracting the enciphered cryptographic information from the at least partially encrypted elementary bitstream using the processor configured by the video decoder process; deciphering the enciphered cryptographic information using the processor configured by a downstream digital rights management component of the video decoder process; decrypting the at least partially encrypted elementary bitstream with the cryptographic information using the processor configured by the downstream digital rights management component of the video decoder process; and decoding the elementary bitstream for rendering on a display device using the processor configured by the video decoder process; wherein the enciphering process and the deciphering process are synchronized such that a delay in excess of a predetermined time between enciphering and deciphering results in the cryptographic information being unrecoverable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for playback of encrypted video, where at least partially encrypted video data is contained within a container file and can be extracted and decrypted to create an elementary bitstream using cryptographic information, which can be used to decrypt the at least partially encrypted video data, comprising:
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a demultiplexer configured to extract at least partially encrypted video data from a container file containing at least partially encrypted video data to create an at least partially encrypted elementary bitstream; and a video decoder configured to decrypt the elementary bitstream using the cryptographic information and decode the at least partially encrypted elementary bitstream for rendering on a display device; wherein the demultiplexer is configured to obtain cryptographic information, encipher the cryptographic information, and insert the enciphered cryptographic information into the at least partially encrypted elementary bitstream; wherein the decoder is configured to extract enciphered cryptographic information from an at least partially encrypted elementary bitstream in which the enciphered cryptographic information is inserted, to decipher the cryptographic information, to decrypt the at least partially encrypted elementary bitstream with the cryptographic information, and to decode the elementary bitstream for rendering on a display device; wherein the demultiplexer and the decoder are configured to synchronize the enciphering process and the deciphering process such that a delay in excess of a predetermined time between enciphering and deciphering results in the cryptographic information being unrecoverable. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of playing back encrypted video on a playback device, where at least partially encrypted video data is contained within a container file and can be extracted and decrypted to create an elementary bitstream using cryptographic information, which can be used to decrypt the at least partially encrypted video data, the method comprising:
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obtaining the cryptographic information using a processor configured by a demultiplexer process, wherein the cryptographic information is obtained from the container file; wherein the at least partially encrypted video data comprises; frames of encoded video; and wherein at least a portion of a plurality of the encoded frames is encrypted; wherein the cryptographic information comprises; key information; and information concerning at least a portion of the least partially encrypted video data that is encrypted using the key information; wherein the information concerning at least a portion of the at least partially encrypted video data is a reference to a block of encrypted data within an encoded frame of video that is encrypted using the key information; and wherein cryptographic information inserted in different locations within the elementary bitstream includes different key information; extracting at least partially encrypted video data from a container file containing at least partially encrypted video data to create an at least partially encrypted elementary bitstream using the processor configured by the demultiplexer process, wherein the cryptographic information inserted in the elementary bitstream is delimited by an identifier; and wherein the cryptographic information is inserted before the at least partially encrypted video data encrypted using the key information; enciphering the cryptographic information using the processor configured by an upstream digital rights management component of the demultiplexer process; inserting the enciphered cryptographic information into the at least partially encrypted elementary bitstream using the processor configured by the upstream digital rights management component of the demultiplexer process, wherein the cryptographic information is extracted using the identifier; providing the at least partially encrypted elementary bitstream in which the enciphered cryptographic information is inserted to a video decoder process using the processor; extracting the enciphered cryptographic information from the at least partially encrypted elementary bitstream using the processor configured by the video decoder process; deciphering the enciphered cryptographic information using the processor configured by a downstream digital rights management component of the video decoder processor, wherein the enciphering process and the deciphering process are synchronized such that a delay in excess of a predetermined time between enciphering and deciphering results in the cryptographic information being unrecoverable; wherein the enciphering process enciphers data by using a sequence of scrambling processes to scramble data; and wherein the deciphering process deciphers data by performing the inverse sequence of scrambling processes in the sequence used to unscramble data; decrypting the at least partially encrypted elementary bitstream with the cryptographic information using the processor configured by the downstream digital rights management component of the video decoder process, wherein the decrypting process is performed by using the key information to identify the encrypted portion of video data and decrypting the encrypted video data using the key information; and decoding the elementary bitstream for rendering on a display device using the processor configured by the video decoder process; wherein the enciphering process and the deciphering process are synchronized such that a delay in excess of a predetermined time between enciphering and deciphering results in the cryptographic information being unrecoverable.
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Specification