Information processing device, information recording medium, information processing method, and program

Patent metadata

Field	Value
Publication number	US-9398330-B2
Application number	US-201414573709-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Aug 22, 2014
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

Provided is an information processing device including: a data processing unit that performs format conversion of converting MPEG-2 TS format data into MP4 format data, wherein the MPEG-2 TS format data is data that includes each segment region having a plurality of pieces of variation data decryptable with different keys, and wherein the data processing unit selects encrypted MP4 variation data from the segment region of the MPEG-2 TS format data and stores the MP4 variation data as MP4 format structure data in an MP4 file, while the encrypted variation data remains, without performing a decryption process and a re-encryption process for the selected MP4 variation data.

First claim

What is claimed is:

1. An information processing device comprising:
circuitry configured to perform format conversion of converting MPEG-2 TS format data into MP4 format data,
wherein the MPEG-2 TS format data is data that includes each segment region having a plurality of pieces of variation data decryptable with different keys,
wherein the circuitry is configured to select encrypted MP4 variation data from the segment region of the MPEG-2 TS format data and store the MP4 variation data as MP4 format structure data in an MP4 file, while the encrypted variation data remains, without performing a decryption process and a re-encryption process for the selected MP4 variation data,
wherein each of the pieces of variation data set in the segment region of the MPEG-2 TS format data is data in which a variation identifier is embedded and is data for which the variation identifier is extractable from decrypted data, and
wherein the segment region of the MEPG-2 TS format data is a data region in which one piece of variation data is selected and reproduced along a reproduction path permitted to a reproduction device.

2. The information processing device according to claim 1 , wherein the MP4 format data is data in conformity with a CFF (Common File Format).

3. The information processing device according to claim 1 ,
wherein MPEG-2 TS variation data and MP4 variation data are set in each segment region of the MPEG-2 TS format data, and
wherein the circuitry is configured to select only the MP4 variation data from each segment region of the MPEG-2 TS format data and store the selected MP4 variation data as the MP4 format structure data in the MP4 file.

4. The information processing device according to claim 1 ,
wherein the MPEG-2 TS format data has the segment regions of different modes:
(1) an MP4 variation data non-set segment region in which no MP4 variation data is set are set; and
(2) an MP4 variation data set segment region in which the plurality of pieces of MP4 variation data is set are set, and
wherein the circuitry is configured to select only the MP4 variation data from the MP4 variation data set segment region and store the selected MP4 variation data as the MP4 format structure data in the MP4 file.

5. The information processing device according to claim 4 , wherein the circuitry is configured to select one piece of decryptable variation data in the MP4 variation data non-set segment region and store the selected variation data as the MP4 format structure data in the MP4 file.

6. The information processing device according to claim 5 , wherein the one piece of decryptable variation data is the variation data selected as reproduction target data along a reproduction path set to correspond to the information processing device.

7. The information processing device according to claim 1 , wherein the circuitry is further configured to receive copy permission notification from a server,
wherein under a condition that the copy permission notification is received, the circuitry is configured to convert the MPEG-2 TS format data stored in a first medium into the MP4 format data and record the MP4 format data on a second medium.

8. The information processing device according to claim 7 , wherein the circuitry is configured to decrypt at least some of the data among the MPEG-2 TS format data excluding the MP4 variation data, perform a re-encryption process by applying a re-encryption key received from the server, and store the re-encrypted data in the MP4 file.

9. A non-transitory information recording medium storing MPEG-2 TS format data,
wherein the MPEG-2 TS format data is data that includes each segment region having a plurality of pieces of variation data decryptable with different keys,
wherein the variation data set in the segment region includes MPEG-2 TS variation data and MP4 variation data,
wherein a conversion device reading the MPEG-2 TS format data recorded on the information recording medium and converting the MPEG-2 TS format data into the MP4 format data is configured to store the MP4 variation data as MP4 format structure data in an MP4 file, while the encrypted variation data remains, without performing a decryption process and a re-encryption process for the MP4 variation data,
wherein each of the pieces of variation data set in the segment region of the MPEG-2 TS format data is data in which a variation identifier is embedded and is data for which the variation identifier is extractable from decrypted data, and
wherein the segment region of the MEPG-2 TS format data is a data region in which one piece of variation data is selected and reproduced along a reproduction path permitted to a reproduction device.

10. An information processing device comprising:
data processing means for performing format conversion of converting MPEG-2 TS format data into MP4 format data; and
communication means for performing communication with a server,
wherein the MPEG-2 TS format data is data that includes each segment region having a plurality of pieces of variation data decryptable with different keys, and
wherein the data processing means selects encrypted MP4 variation data from the segment region of the MPEG-2 TS format data and stores the MP4 variation data as MP4 format structure data in an MP4 file, while the encrypted variation data remains, without performing a decryption process and a re-encryption process for the selected MP4 variation data,
wherein each of the pieces of variation data set in the segment region of the MPEG-2 TS format data is data in which a variation identifier is embedded and is data for which the variation identifier is extractable from decrypted data, and
wherein the segment region of the MEPG-2 TS format data is a data region in which one piece of variation data is selected and reproduced along a reproduction path permitted to a reproduction device.

11. An information processing method performed in an information processing device, the information processing method comprising:
performing format conversion of converting MPEG-2 TS format data into MP4 format data, the MPEG-2 TS format data being data that includes a segment region having a plurality of pieces of variation data decryptable with different keys; and
selecting encrypted MP4 variation data from the segment region of the MPEG-2 TS format data and storing the MP4 variation data as MP4 format structure data in an MP4 file, while the encrypted variation data remains, without performing a decryption process and a re-encryption process for the selected MP4 variation data,
wherein each of the pieces of variation data set in the segment region of the MPEG-2 TS format data is data in which a variation identifier is embedded and is data for which the variation identifier is extractable from decrypted data, and
wherein the segment region of the MEPG-2 TS format data is a data region in which one piece of variation data is selected and reproduced along a reproduction path permitted to a reproduction device.

12. A non-transitory computer-readable storage medium including computer executable instructions, wherein the instructions, when executed by a computer, cause the computer to perform a method, the method comprising:
performing format conversion of converting MPEG-2 TS format data into MP4 format data, the MPEG-2 TS format data being data that includes a segment region having a plurality of pieces of variation data decryptable with different keys;
performing a process of selecting encrypted MP4 variation data from the segment region of the MPEG-2 TS format data; and
performing a process of storing the MP4 variation data as MP4 format structure data in an MP4 file, while th

Assignees

• Sony Corp
• Sony Pictures Entertainment

Inventors

• Ueda Kenjiro
• Oishi Tateo
• Takashima Yoshikazu

Classifications

• G06F2221/0724

  Physics · mapped topic

• G06F21/10

  Protecting distributed programs or content, e.g. vending or licensing of copyrighted material (protection in video systems or pay television H04N7/16) {; Digital rights management [DRM]} · CPC title

• H04N21/2347

  involving video stream encryption · CPC title

• H04N21/440218 Primary

  by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 (conversion of standards in analogue television systems H04N7/01) · CPC title

• H04N21/4405

  involving video stream decryption · CPC title