Receiving apparatus
View Patent ↗A transmission apparatus updates the encryption method in the event the encryption method is broken. The tool ID of a decryption tool for encrypted data is acquired, the presence of the tool is confirmed and the tool is then acquired and updated, and encrypted data is processed and transmitted based on rights information associated with the encrypted data.
1. A receiving apparatus, comprising:
a demultiplexer that separates a multiplexed signal containing first encrypted data into at least the first encrypted data and program-specific information;
a tool list demultiplexor that separates a tool list having a tool identification indicating a decoding tool for decrypting the first encrypted data from the multiplexed signal;
a control graph demultiplexor that separates a control graph indicating an instantiated location of the decoding tool in the receiving apparatus from the multiplexed signal;
a rights information demultiplexor that demultiplexes rights information for the first encrypted data from the multiplexed signal, the rights information specifying at least one of rights for a permitted number of accesses and rights for editing in the receiving apparatus;
a first controller that acquires a tool according to the tool identification acquired from the tool list, and instantiating the tool according to the control graph;
a first rights manager that processes the first encrypted data according to the rights information;
a second rights manager that separates the rights information into first rights information and second rights information; and
a multiplexing adjustor that modifies the rights information in the multiplexed signal, and that outputs a revised multiplexed signal,
wherein the revised multiplexed signal is output to a second receiving apparatus in accordance with a request signal from the second receiving apparatus.
2. The receiving apparatus according to claim 1 , further comprising:
a temporary storage that temporarily stores the first encrypted data; and
a file manager that deletes from the temporary storage the first encrypted data after a playback permit recorded in the rights information is expired.
3. The receiving apparatus according to claim 1 ,
wherein the rights manager sends status information denoting a processing state of the first encrypted data.
4. The receiving apparatus according to claim 1 , further comprising:
a rights manager that separates the rights information into first rights information and second rights information;
wherein the second rights information and multiplexed signal are output to a second receiving apparatus according to a request signal from the second receiving apparatus.
5. The receiving apparatus according to claim 1 ,
wherein the rights manager receives data indicating how the first encrypted data was processed by a second receiving apparatus, and sends status information describing processing by the receiving apparatus and the second receiving apparatus.
6. The receiving apparatus according to claim 1 , further comprising:
a converter that converts the first encrypted data to second encrypted data; and
a remultiplexer that remultiplexes the second encrypted data with second rights information.
7. The receiving apparatus according to claim 1 ,
wherein the first encrypted data is processed according to the first rights information.
8. The receiving apparatus according to claim 1 , further comprising:
a temporary storage that temporarily stores the first encrypted data; and
a file manager that deletes the first encrypted data from the temporary storage after sending it to a second receiving apparatus.
9. The receiving apparatus according to claim 1 , further comprising:
a video decoder that extracts and decodes video data from the multiplexed signal.
10. The receiving apparatus according to claim 1 , further comprising:
an audio decoder that extracts and decodes audio data from the multiplexed signal.
11. The receiving apparatus according to claim 3 ,
wherein the processing state in the receiving apparatus comprises the permitted number of accesses, editing allowed information and editing prohibited information.
12. The receiving apparatus according to claim 5 ,
wherein a processing state in the second receiving apparatus comprises the permitted number of accesses, editing allowed information and editing prohibited information.