INFORMATION PROCESSING DEVICE, INFORMATION RECORDING MEDIUM, INFORMATION PROCESSING METHOD, AND PROGRAM

• US 20160057491A1
• Filed: 12/17/2014
• Published: 02/25/2016
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Pictures Entertainment Incorporated (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Pictures Entertainment Incorporated (Sony Group Corp.)
• Inventors: UEDA, Kenjiro, Oishi, Tateo, Takashima, Yoshikazu
• Granted Patent: US 9,398,330 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 21/1062 Editing
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 21/234309 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo conversion of standards in analog television systems H04N7/01
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/440218 by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 conversion of standards in analogue television systems H04N7/01
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/8456 by decomposing the content in the time domain, e.g. in time segments
• CPC Class Codes: H04N 21/85406 involving a specific file format, e.g. MP4 format
• CPC Class Codes: H04N 21/8541 involving branching, e.g. to different story endings

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.

Claims

1. An information processing device comprising:

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.

2. The information processing device according to claim 1, 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.

3. The information processing device according to claim 1, 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.

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

5. 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 data processing unit selects only the MP4 variation data from each segment region of the MPEG-2 TS format data and stores the selected MP4 variation data as the MP4 format structure data in the MP4 file.

6. 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 data processing unit selects only the MP4 variation data from the MP4 variation data set segment region and stores the selected MP4 variation data as the MP4 format structure data in the MP4 file.

7. The information processing device according to claim 6, wherein the data processing unit selects one piece of decryptable variation data in the MP4 variation data non-set segment region and stores the selected variation data as the MP4 format structure data in the MP4 file.

8. The information processing device according to claim 7, 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.

9. The information processing device according to claim 1, further comprising:

a communication unit that receives copy permission notification from a server,

wherein under a condition that the copy permission notification is received, the data processing unit converts the MPEG-2 TS format data stored in a first medium into the MP4 format data and records the MP4 format data on a second medium.

10. The information processing device according to claim 9, wherein the data processing unit decrypts at least some of the data among the MPEG-2 TS format data excluding the MP4 variation data, performs a re-encryption process by applying a re-encryption key received from the server, and stores the re-encrypted data in the MP4 file.

11. An 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, and

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 able 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.

12. An information processing device comprising:

a data processing unit that performs a process of reproducing MP4 format data; and

a communication unit that performs communication with a server,

wherein the MP4 format data is data which includes a segment region having a plurality of pieces of variation data decryptable with different keys and in which a plurality of reproduction paths is settable according to the variation data selected as reproduction targets,

wherein each piece of variation data is data for which a variation data identifier is able to be analyzed from decrypted data,

wherein the communication unit receives reproduction path information permitted to be reproduced from the server, and

wherein the data processing unit selects the variation data from the segment region according to the reproduction path information received from the server and performs content reproduction.

13. The information processing device according to claim 12,

wherein the MP4 format data is data stored in an information recording medium, and

wherein the communication unit

transmits a content identifier corresponding to the MP4 format data or an identifier of the information recording medium to the server, and

receives the reproduction path information permitted to correspond to the MP4 format data from the server.

14. The information processing device according to claim 12, wherein the data processing unit acquires a segment key from a segment key file received from the server and decrypts the variation data by applying the acquired segment key.

15. An information processing method performed in an information processing device,

wherein the information processing device includes 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 a 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.

16. An information processing method performed in an information processing device,

wherein the information processing device includes

a data processing unit that performs a process of reproducing MP4 format data, and

a communication unit that performs communication with a server,

wherein the MP4 format data is data which includes a segment region having a plurality of pieces of variation data decryptable with different keys and in which a plurality of reproduction paths is settable according to the variation data selected as reproduction targets,

wherein each piece of variation data is data for which a variation data identifier is able to be analyzed from decrypted data, and

wherein the data processing unit selects the variation data from the segment region according to the reproduction path information received from the server and performs content reproduction.

17. A program causing an information processing device to perform information processing,

wherein the information processing device includes 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 a segment region having a plurality of pieces of variation data decryptable with different keys, and

wherein the program causes the data processing unit to perform

a process of selecting encrypted MP4 variation data from the segment region of the MPEG-2 TS format data, and

a process of 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.

18. A program causing an information processing device to perform information processing,

wherein the information processing device includes

a data processing unit that performs a process of reproducing MP4 format data, and

a communication unit that performs communication with a server,

wherein the MP4 format data is data which includes a segment region having a plurality of pieces of variation data decryptable with different keys and in which a plurality of reproduction paths is settable according to the variation data selected as reproduction targets,

wherein each piece of variation data is data for which a variation data identifier is able to be analyzed from decrypted data, and

wherein the program causes the data processing unit to select the variation data from the segment region according to the reproduction path information received from the server and perform content reproduction.