Information recording and/or reproducing apparatus

Patent metadata

Field	Value
Publication number	US-9495998-B2
Application number	US-64739506-A
Country	US
Kind code	B2
Filing date	Dec 29, 2006
Priority date	Aug 20, 1999
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Contents data that have been enciphered and transmitted are recorded as they are on a recording medium, and the contents key used to encipher these data is enciphered in a way used in this recording system and is recorded on the medium. Moreover, a step is taken to ensure that fine trick plays can be performed. In recording contents data that have been enciphered and transmitted, the contents data themselves are recorded in the enciphered state on the recording medium. However, the contents data are decoded by a contents data decoding circuit 46 , and a map file containing necessary management information for reproduction is created by a map file creating circuit 47 and this file is recorded together with the contents data.

First claim

The invention claimed is:

1. A computer readable non-transitory storage recording medium for use in a reproducing apparatus, said computer readable non-transitory storage recording medium being created by a recording apparatus having a map file creating circuit, said computer readable non-transitory storage medium having stored thereon:
enciphered contents data, wherein the contents data is recorded as a sequence of transport packets, a packet identifier (PID) is located at a fixed position on a transport packet header contained on the transport packets;
a PID filter output comprising transport packets of specified PID from the transport packets;
a map file including management information for reproduction, wherein the management information contained in the map file is associated with the enciphered contents data, the enciphered contents data being enciphered by means of a content key (Kc);
an identification key (Kd) created according to medium identification information allocated to the computer readable non-transitory storage recording medium; and
processor readable instructions for locating recording medium access positions, for performing a calculating and decoding process involving the Kd to obtain a calculated content key (Kc), and for decoding the enciphered contents data by using the calculated content key (Kc),
wherein the recording medium access positions are addresses on the computer readable non-transitory storage medium equal to time stamp addresses for the transport packets outputted from the PID filter,
wherein a total number of the recording medium access positions is less than a total number of the transport packets outputted from the PID filter such that a respective recording medium access position is not provided for each transport packet outputted from the PID filter, and
wherein the map file creating circuit includes the PID filter, a program association table/program map table (PAT/PMT) analysis unit and a stream analysis unit, in which the outputted transport packets from the PID filter are supplied to the PAT/PMT analysis unit and the outputted transport packets from the PID filter which pertain only to video data and/or audio data are supplied to the stream analysis unit, and in which the stream analysis unit obtains information pertaining to the recording medium access positions.

2. The computer readable non-transitory storage recording medium of claim 1 , wherein the PAT/PMT analysis unit is configured to receive PAT transport packets, wherein PAT contains the PID of transport packets of the PMT of audio-video (AV) programs multiplexed in a transport stream.

3. The computer readable non-transitory storage recording medium of claim 1 , wherein the PAT/PMT analysis unit is configured to set the PID of the PMT of audio-video (AV) programs in the PID filter.

4. The computer readable non-transitory storage recording medium of claim 1 , wherein the PAT/PMT analysis unit is configured to receive transport packets of PMT.

5. The computer readable non-transitory storage recording medium of claim 1 , wherein the PAT/PMT analysis unit is configured to set the PID of transport packets carrying a video stream or an audio stream constituting an audio-video (AV) program as their payloads in the PID filter and the stream analysis unit.

6. The computer readable non-transitory storage recording medium of claim 1 , wherein the management information for reproduction includes a PID of transport packets of video data constituting audio-video (AV) programs and a stream_type of video data, a PID of transport packets of audio data constituting AV programs and a stream_type of audio data, a program clock reference (PCR)_PID of AV programs, a list of random access points of AV video data, and a list of random access points of AV audio data.

7. An apparatus comprising:
a computer readable non-transitory storage medium containing processor readable instructions; and
a processor configured to cause a plurality of steps to be performed upon execution of the readable instructions from the computer readable non-transitory storage medium, said steps include
inputting content information recorded as a sequence of transport packets,
wherein a packet identifier (PID) is located at a fixed position on a transport packet header contained on the transport packets;
outputting, by a PID filter, transport packets of specified PID from the transport packets;
creating a map file, the map file including management information for reproduction, wherein the management information contained in the map file is associated with enciphered contents data, the enciphered contents data being enciphered by means of a content key (Kc);
creating an identification key (Kd) according to medium identification information allocated to a respective recording medium;
extracting access positions for the transport packets outputted from the PID filter;
creating management information including one or more access positions for the transport packets outputted from the PID filter, wherein the recording medium access positions are addresses on the respective recording medium equal to time stamp addresses for the transport packets outputted from the PID filter and wherein a total number of the recording medium access positions is less than a total number of the transport packets outputted from the PID filter such that a respective recording medium access position is not provided for each transport packet outputted from the PID filter; and
writing the inputted content information and the management information on the respective medium,
wherein the map file is created by a map file creating circuit which includes the PID filter, a program association table/program map table (PAT/PMT) analysis unit and a stream analysis unit, in which the outputted transport packets from the PID filter are supplied to the PAT/PMT analysis unit and the outputted transport packets from the PID filter which pertain only to video data and/or audio data are supplied to the stream analysis unit, and in which the stream analysis unit obtains information pertaining to the recording medium access positions.

8. The apparatus of claim 7 , wherein the PAT/PMT analysis unit is configured to receive PAT transport packets, wherein PAT contains the PID of transport packets of the PMT of audio-video (AV) programs multiplexed in a transport stream.

9. The apparatus of claim 7 , wherein the PAT/PMT analysis unit is configured to set the PID of the PMT of audio-video (AV) programs in the PID filter.

10. The apparatus of claim 7 , wherein the PAT/PMT analysis unit is configured to receive transport packets of PMT.

11. The apparatus of claim 7 , wherein the PAT/PMT analysis unit is configured to set the PID of transport packets carrying a video stream or an audio stream constituting an audio-video (AV) program as their payloads in the PID filter and the stream analysis unit.

12. A reproducing apparatus comprising:
management information reading means for reading, from a recording medium, management information and contents information recorded as a sequence of transport packets, the management information including one or more access positions for the content information, wherein a packet identifier (PID) is located at a fixed position on a transport packet header contained on the transport packets, a PID filter removes transport packets of specified PID from the transport packets, the access positions are addresses on the recording medium equal to a time stamp for the transport packets outputted from the PID filter, and a total number of the recording medium access positions is less than a total number of the transport packets outputted from the PID f

Assignees

• Asano Tomoyuki
• Osawa Yoshitomo
• Kato Motoki
• Sony Corp

Inventors

• Asano Tomoyuki
• Osawa Yoshitomo
• Kato Motoki

Classifications

• G11B2220/2575

  DVD-RAMs · CPC title

• H04N21/4627

  Rights management {associated to the content (security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08)} · CPC title

• G11B2220/216

  Rewritable discs · CPC title

• H04N21/8455

  involving pointers to the content, e.g. pointers to the I-frames of the video stream · CPC title

• G11B2220/2529

  Mini-discs · CPC title