JP2016197478A - Information processor, information record medium, information processing method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a piece of content which generates no reproduction error due to buffer underflow when reproducing a piece of content which has individual segment areas each constituted of select reproduction data corresponding to a reproduction path.SOLUTION: A piece of content is generated, in which a piece of identification information different from each other is embedded and which has individual segment areas including plural variation data decodable with a key different from each other and a common segment area including a single piece of data. A data processing section generates a piece of content using a single independent segment area and a part of an area of common segment area preceding the individual segment area as a bit rate determination area so that the local bit rate R (lb) of the respective bit rate determination areas in the content is a prescribed maximum record rate [MaxR(TS)] or less.SELECTED DRAWING: Figure 16

Description

  The present disclosure relates to an information processing device, an information recording medium, an information processing method, and a program. More specifically, the present invention relates to an information processing apparatus, an information recording medium, an information processing method, and a program that enable normal reproduction of content embedded with data for tracking the origin of illegally distributed content.

  DVD (Digital Versatile Disc) and BD (Blu-ray (registered trademark) Disc) are widely used as information recording media (media) for recording various contents such as movies and music.

  Many contents such as music data and image data recorded on these information recording media have copyrights, distribution rights, etc. held by their creators or distributors. Therefore, when content is stored in such an information recording medium (media) and provided to the user, it is common to perform usage control that allows the use of the content only to users who have regular usage rights.

  Specifically, for example, control is performed such that the content is recorded as encrypted content and can be decrypted only by the encryption key provided to the user who has performed the regular content purchase processing. However, even if such processing is performed, for example, if content that has been decrypted by a user who has acquired encrypted content, or if processing such as unauthorized distribution or disclosure of an encryption key is performed, an unspecified number of content is illegal Use occurs. In particular, in recent years, there are many cases where unauthorized disclosure and distribution of data via a network are performed, and how to prevent these frauds has become a major issue.

As one countermeasure for preventing the distribution of unauthorized content, there is a configuration in which a device that has performed decryption processing or unauthorized copying can be identified based on decrypted (plaintext) content.
This is a configuration that analyzes decrypted content generated by decrypting encrypted content, for example, decrypted image data, and determines a device that has performed decryption processing based on an identification mark extracted from the image.
For example, Patent Document 1 (Japanese Patent Laid-Open No. 2006-236121), Patent Document 2 (Japanese Patent Laid-Open No. 2007-43336), and the like, describe the configuration that enables the origin tracking.

  The configurations described in these patent documents set a plurality of variation data in which different identification marks are embedded in segments of content data, for example, images of a scene constituting movie content, and can be decrypted with different keys. Is. Each reproduction device applies a key unique to the reproduction device stored in the reproduction device, selects one piece of data that can be decrypted from a plurality of variation data, and decrypts and reproduces the data. A playback device that stores different keys decodes and plays back different variation data for images of the same scene. In this way, different variation data is selected and played back by each playback device. That is, reproduction processing is performed according to different reproduction paths depending on the reproduction apparatus.

  For example, when copy data of decrypted content is illegally distributed via a network, an apparatus that generates illegally distributed copy data by analyzing variation data and playback paths in which different identification marks included in the content are embedded, That is, it is possible to specify the device that decrypted the content in a predetermined unit.

  However, when various different variation data are recorded on the disc, the reproducing device performs processing for selecting only the variation data assigned to the device from the read data from the disc and reproducing it.

The playback device temporarily stores not only the variation data assigned to the device itself but also the variation data not to be played back in the buffer for storing the data read from the disc.
When the buffer occupancy rate of non-reproduction data increases, there is a problem that the buffer accumulation amount of reproduction data decreases, and reproduction data cannot be acquired from the buffer, and the possibility of causing a reproduction error increases.

JP 2006-236121 A JP 2007-43336 A

  The present disclosure has been made in view of, for example, such problems, and in a configuration in which one variation data is selected and reproduced from content in which a plurality of variation data is set, the reproduction data is reliably transmitted from the buffer. An object is to provide an information processing apparatus, an information recording medium, an information processing method, and a program that can be acquired and reproduced.

The first aspect of the present disclosure is:
A data processing unit for generating disc recording content;
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
The information processing apparatus generates content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].

Furthermore, the second aspect of the present disclosure is:
It has a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
The information processing apparatus executes processing for determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

Furthermore, the third aspect of the present disclosure is:
Different identification information is embedded in each, and each has a segment segment composed of a plurality of variation data that can be decrypted with a different key, and a common segment region composed of a single data,
An information recording medium in which content capable of setting a plurality of playback paths according to variation data to be selected is stored as recording data.
The content is
A local bit rate R (lb) of a bit rate determination area consisting of one individual segment area and a partial area of the common segment area preceding the individual segment area is a predetermined maximum recording rate [MaxR (TS)]. It exists in the information recording medium which is the content set as follows.

Furthermore, the fourth aspect of the present disclosure is:
An information processing method executed in an information processing apparatus,
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
There is an information processing method for generating content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].

Furthermore, the fifth aspect of the present disclosure is:
An information processing method executed in an information processing apparatus,
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
There is an information processing method for executing a process for determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

Furthermore, the sixth aspect of the present disclosure is:
A program for executing information processing in an information processing apparatus;
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
There is a program for generating a content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].

Furthermore, the seventh aspect of the present disclosure is:
A program for executing information processing in an information processing apparatus;
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
A program for executing a process for determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is equal to or less than a predetermined maximum recording rate [MaxR (TS)].

  Note that the program of the present disclosure is a program that can be provided by, for example, a storage medium or a communication medium provided in a computer-readable format to an information processing apparatus or a computer system that can execute various program codes. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the information processing apparatus or the computer system.

  Other objects, features, and advantages of the present disclosure will become apparent from a more detailed description based on embodiments of the present disclosure described below and the accompanying drawings. In this specification, the system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.

According to the configuration of an embodiment of the present disclosure, it is possible to efficiently generate content that does not cause a playback error due to a buffer underflow when playing content having an individual segment area composed of selected playback data corresponding to a playback path. It becomes.
Specifically, different identification information is embedded in each, and content having individual segment areas composed of a plurality of variation data that can be decrypted with different keys and a common segment area composed of a single data is generated. A data processing unit that generates content uses a local area of each bit rate determination area in the content as an area composed of one individual segment area and a partial area of a common segment area preceding the individual segment area. Content with a bit rate R (lb) set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)] is generated.
With this configuration, it is possible to efficiently generate content that does not cause a reproduction error due to buffer underflow when content having an individual segment area composed of selected reproduction data corresponding to the reproduction path is reproduced.
Note that the effects described in the present specification are merely examples and are not limited, and may have additional effects.

It is a figure explaining the structural example of the content which has an individual segment area | region and a common segment area | region. It is a figure explaining the structure of the content which has an individual segment area | region and a common segment area | region, and the playback path corresponding to a playback device. It is a figure explaining the example of identification information detection from the structure data of the content which has an individual segment area | region and a common segment area | region. It is a figure explaining the example of a recording structure on the disc of the content which has an individual segment area | region and a common segment area | region. It is a figure explaining the structural example of MPEG-2TS (transport stream). It is a figure explaining the example of a reproduction | regeneration processing of the content which has an individual segment area | region and a common segment area | region. It is a figure explaining transition of the accumulation data of the data buffer in reproduction processing. It is a figure explaining the underflow generation | occurrence | production avoidance condition of the data buffer in reproduction | regeneration processing. It is a figure explaining the underflow generation | occurrence | production avoidance condition of the data buffer in reproduction | regeneration processing. It is a figure explaining the transition of the accumulation | storage data of the data buffer in a reproduction | regeneration process, and the underflow generation | occurrence | production avoidance conditions of a buffer. It is a figure explaining transition of the accumulation data of the data buffer in reproduction processing. It is a figure explaining the underflow generation | occurrence | production avoidance condition of the data buffer in reproduction | regeneration processing. It is a figure explaining the underflow generation | occurrence | production avoidance condition of the data buffer in reproduction | regeneration processing. It is a figure explaining the transition of the accumulation | storage data of the data buffer in a reproduction | regeneration process, and the underflow generation | occurrence | production avoidance conditions of a buffer. It is a figure explaining prescription | regulation of the disk recording content corresponding to UHD-BD. It is a figure explaining an example of the bit rate judgment processing of this indication. It is a figure explaining an example of the bit rate judgment processing of this indication. It is a figure explaining an example of the bit rate judgment processing of this indication. It is a figure explaining the recording and reproduction | regeneration processing sequence of the content which has an individual segment area | region and a common segment area | region. FIG. 25 is a diagram for describing an example hardware configuration of an information processing device.

The details of the information processing apparatus, information recording medium, information processing method, and program of the present disclosure will be described below with reference to the drawings. The description will be made according to the following items.
1. 1. Outline of source tracking process based on playback path analysis 2. Outline of data reproduction processing in information processing apparatus 3. Data accumulation processing for data buffer and possibility of underflow 4. Processing for determining whether the content satisfies the specified maximum recording rate 5. Determination processing of divided and recorded content 6. Sequence of processing executed by information processing apparatus 7. About hardware configuration example of information processing device Summary of composition of this disclosure

[1. Overview of source tracking process based on playback path analysis]
First, the outline of the origin tracking process based on the reproduction path analysis will be described.
FIG. 1 is a diagram showing a configuration example of content that enables origin tracking processing based on reproduction path analysis. The content is content such as a movie recorded on a disc, for example.
In the content, a common segment area (single data area) and an individual segment area are set.
The common segment area (single data area) is constituted by data reproduced in common in all reproducing apparatuses.

On the other hand, the individual segment area is constituted by a plurality of pieces of data (variation data) in which a plurality of different identification information is embedded with respect to, for example, a certain scene constituting movie content.
The example shown in the figure is an example having image data (variation data) in which 1-bit data different in 0b and 1b is embedded.
For example, the individual segment area-1 is data constituting one image frame constituting movie content,
(1) [0b] embedded with a bit value [0],
(2) [1b] with embedded bit value [1],
These two image frames (variation data) are configured.
Each reproduction device selects and reproduces one of the data (1) and (2).

Note that one rectangular box set to 0b or 1b shown in the figure represents an aligned unit of 6144 bytes (B).
The aligned unit is data constituting MPEG-2TS (Transport Stream) and is data serving as one encryption unit.

For example, one image frame is generated by data of a plurality of aligned units of [0b] in the individual segment area-1.
Similarly, one image frame is generated by data of a plurality of aligned units of [1b] in the individual segment area-1.
These are, for example, one and the same image frame that makes up the movie content.
However, it is possible to detect the identification bit [0] from the image frame generated from the data [0b] by the identification mark detection process, and the identification bit from the image frame generated from the data [1b]. [1] can be detected.

  Note that the identification marks 0 and 1 are embedded in an image frame as, for example, a digital watermark and cannot be recognized by normal image observation, but each bit value is detected by a digital watermark detection process using a special detection device. It becomes possible.

For each playback device. A playback path corresponding to the playback device is assigned in advance, and the playback device selects one image frame configuration data (either 0b or 1b in the example shown in the figure) from each individual segment area according to the assigned playback path. Reproduce.
Note that the playback apparatus holds a decryption key for the aligned unit selected according to the playback path assigned to the playback apparatus. Since the playback device does not have an aligned unit decryption key other than the assigned playback path, it cannot decrypt or play back data in other playback paths.

In the example shown in FIG. 1, the playback path A assigned to the playback device A is as follows.
In the individual segment area-1, select [0b].
In the individual segment area-2, select [1b]
A path to be selected and reproduced in this way is assigned.

In this way, different playback paths are set in association with playback devices or predetermined playback device groups.
For example, when a malicious playback device illegally duplicates (copies) content that has been decrypted and played back according to a predetermined playback path and distributes the content, an identification mark embedded in each individual segment area is analyzed. Can be detected.
By this analysis process, one playback path is discriminated, a playback device that can use the playback path can be specified, and the origin of illegally distributed content can be specified.

FIG. 2 is a diagram showing an example of setting identification marks (embedded data) for each individual segment area according to the playback path associated with each playback device A, B˜.
The reproducing device A reproduces the identifier embedded data of 0, 1, 0,..., 0 for each individual segment area 1 to n.
The reproduction apparatus B reproduces the identifier embedded data of 1, 1, 0,..., 1 for each individual segment area 1 to n.
In this way, the bit strings embedded in the individual segment areas 1 to n constituting the playback path selected according to the playback device are different. By analyzing this bit string, one playback path is determined and the playback is performed. It becomes possible to specify the playback apparatus to which the path is assigned.

With reference to FIG. 3, the reproduction image data by each reproduction device and the source analysis processing based on the reproduction image data will be described.
The information recording medium (disc) 10 shown in FIG. 3 stores content composed of the individual segment area and the common segment area (single data area) described with reference to FIG.
The playback devices A and 21 perform content playback according to the playback path A described with reference to FIG.
The playback devices B and 22 execute content playback according to a playback path B different from the playback path A.

Reproduced images A and 31 are image frames constituted by data (variation data) selected from one individual segment area according to the reproduction path A.
The reproduced images B and 32 are image frames composed of different variation data selected from the same individual segment area, and are image frames composed of variation data included in the reproduction path B.
These two reproduced images A and B are both images of the same scene of the movie content, for example, and are images that are viewed without distinction by the viewer.

However, the reproduced images A and 31 are image frames composed of variation data included in the reproduction path A, and a specific variation identifier (data identifier) = [0b] is embedded in the reproduced images A and 31. . For example, the identifier [0b] can be analyzed by a digital watermark (Water Mark) analysis process.
The identification information embedded in the reproduction data in this way is called a forensic mark or a forensic watermark.

  One reproduction image B, 32 is an image frame composed of variation data included in the reproduction path B, and a specific variation identifier (data identifier) = [1b] is embedded in the reproduction image B, 32. . For example, the identifier [1b] can be analyzed by a digital watermark (Water Mark) analysis process.

For example, 15 individual segment regions (individual segments 1 to 15) are set in the content shown in FIG.
For example, when illegally distributed copy content is found on the network, it is possible to determine which variation data is the reproduced image in the 15 individual segment areas included in the illegally distributed content. Becomes clear.

Next, a data recording configuration example on the disc will be described with reference to FIG.
FIG. 4 shows the following figures.
(A) Individual segment setting mode (B) Data recording mode on disk

(A) As shown in the individual segment setting mode, the individual segment area is a setting having two variation data composed of a plurality of aligned units.
In the present embodiment, each individual segment area has only two variation data.
Each variation data is composed of a plurality of aligned units.
Each aligned unit is 6144 byte data.

In each variation data set in the individual segment area, an identifier corresponding to the variation data is embedded as a digital watermark (Water Mark).
In the example shown in the figure, aligned units in which different embedded digital watermark data are recorded are shown as an aligned unit (0b) and an aligned unit (1b).

  The individual segment areas are set alternately with the common segment areas. Various settings are possible for the number of individual segment areas set in one title-compatible content. For example, it is about several hundreds. The playback device applies a plurality of types of segment keys and one CPS unit key, and decrypts and plays back the content along the playback path set for each playback device.

For example, as shown in FIG. 4A, the playback apparatus A selects the aligned unit (0b) as variation data in the individual segment area-1, and aligned as variation data in the individual segment area-2. Select unit (1b) and play.
The playback path is determined by a device key possessed by the playback device.

FIG. 4B shows a data recording configuration on the disc. As shown in FIG. 4B, the individual segment area data is recorded alternately in units of aligned units of 6144B (bytes).
That is, the aligned unit (0b) and the aligned unit (1b) are recorded alternately.

Next, with reference to FIG. 5, a configuration example of content composed of images and the like as reproduction target data will be described.
A file (clip AV stream file) storing actual image and audio data to be reproduced is, for example, an MPEG-2 transport stream (TS) file as shown in FIG. With structure.

As shown in FIG. 5, the MPEG-2TS format has the following characteristics.
1) An MPEG-2TS file is composed of an integer number of aligned units.
2) The size of the aligned unit is 6 kB (= 6144 bytes (2048 × 3 bytes)).
3) The aligned unit starts from the first byte of the source packet.
4) The source packet is 192 bytes long. One source packet includes a TP_extra_header and a TS packet. The TP_extra_header is 4 bytes long, and the TS packet is 188 bytes long.

5) The TS packet has a header (TP header) and a payload portion. The payload of one TS packet stores encoded data of any one type of data such as an image and sound.
6) A PID (program ID) indicating the data type of the payload is recorded in the header (TP header) of the TS packet.
7) The payload of a TS packet is composed of a packet (packetized elementary stream (PES)) that stores an elementary stream (ES) that is encoded data such as an image and sound, a PES header, and the like.
8) The PES header includes a presentation time stamp (PTS) indicating the playback time information of the elementary stream (ES) stored in the subsequent PES packet and a decoding time stamp (DTS) indicating the decoding processing time. To be recorded.

Further, as shown in FIG. 5E, the following data is stored in the header information of the TS packet.
(A) Byte for synchronization (Sync byte)
(B) Transport error identifier (Transport_error_indicator)
(C) Payload unit start identifier (Payload_unit_start_indicator)
(D) Transport priority (Transport_priority)
(E) Program ID (PID)
(F) Transport scrambling control (Transport scrambling control)
(G) Adaptation field control (Adaptation field control)
(H) Continuity counter
(I) Adaptation field (Adaptation field)

[2. Outline of data reproduction processing in information processing apparatus]
Next, an overview of data reproduction processing in the information processing apparatus will be described with reference to FIG.
FIG. 6 shows information for playing back the content described with reference to FIG. 1 and the like, that is, the content according to a specific playback path by mounting the disc 10 storing the content having the common segment area and the individual segment area. It is a figure explaining the structure and process of a processing apparatus.

The disk drive 41 reads content configuration data from the disk and stores it in the data buffer 42.
Note that the data supply rate from the disk drive 41 to the data buffer 42, that is, the data reading rate from the disk is R (UD).
In addition, the subscript shown in a figure is described and described in () in this specification.
That is, R (UD) is the same as _RUD .

The data stored in the data buffer 42 is subjected to decryption processing (Decrypt) using a predetermined encryption key in the reproduction data decryption unit 42 a, and then read by the source packet analysis unit 43. The source packet analysis unit 43 extracts a transport packet (TS packet) that is source packet configuration data according to the time stamp set in the header of the source packet and supplies it to the TS packet decoding unit 45.
The clock information supply unit 44 supplies clock information to the source packet analysis unit 43.

The data acquisition rate at which the source packet analysis unit 43 acquires data from the data buffer 42 is R (TS) × (192/188).
R (TS) is the playback rate. This is the playback rate of 188-byte TS (transport stream).
As described with reference to FIG. 5, the source packet is 192-byte data including a 4-byte header in a 188-byte TS packet, and the data acquisition rate at which the source packet analysis unit 43 acquires data from the data buffer 42 is , R (TS) × (192/188).

The source packet analysis unit 43 outputs a 188-byte TS packet to the TS packet decoding unit 45. This output rate is the reproduction rate R (TS).
The TS packet decoding unit 45 extracts image data and the like to be reproduced from the TS packet, executes encoded data decoding (Decode) processing, and outputs the reproduction data to an output unit such as a display unit or a speaker.
The output rate is R (TS).

[3. Data storage processing for data buffer and possibility of underflow]
Next, with reference to FIG. 7 and subsequent figures, the data accumulation process for the data buffer 42 of the information processing apparatus shown in FIG. 6 and the possibility of underflow will be described. The underflow means that there is no reproduction target data in the data buffer 42.

The graph shown in FIG. 7 is a graph showing the time transition of the accumulation amount of the reproduction target data accumulated in the data buffer 42 in the information processing apparatus shown in FIG.
The horizontal axis is the time axis, and the vertical axis indicates the buffer accumulation amount of the reproduction target data accumulated in the data buffer 42.

Note that the content to be played back is content that includes the common segment area and the individual segment areas described with reference to FIG.
The reproduction data buffer accumulation amount on the vertical axis is
(A) data read from the common segment area;
(B) Reproduction target data selected according to the reproduction path of the reproduction apparatus among the data read from the individual segment area,
It corresponds to these data accumulation amounts.
That is, the accumulated amount of data not to be reproduced in the individual segment area is not included.

At time T0 to T1, data read from the common segment area of the disc is stored in the buffer. These read data are all reproduction target data.
From time T1 to T7, all the data read from the individual segment area of the disc is stored in the buffer, but the reproduction target data is only the data [1b] in the buffer accumulated data.
In the example illustrated in FIG. 7, it is assumed that the playback path associated with the playback device is a path for selecting and playing back only the variation data [1b].
Therefore, the variation data [0b] is accumulated in the buffer 42 read from the disk 10, but this data is not equivalent to the reproduction data buffer accumulation amount.

The reproduction data buffer accumulation rate (bps) at times T0 to T1 is a rate according to the following equation.
R (UD) −R (eb) × (192/188) (Formula 1)

R (eb) is an effective rate, and R (TS) described with reference to FIG. 6 is a rate equal to the reproduction rate.
This corresponds to the playback rate of a 188-byte TS packet.

As described with reference to FIG. 6, R (UD) is a buffer input data rate inputted from the disk 10 to the data buffer 42, and is a data reading rate from the disk.
R (eb) × (192/188) is a buffer output data rate output from the data buffer 42 to the source packet analysis unit 43.
As described with reference to FIG. 5, since the source packet has a 192-byte configuration in which a 4-byte header is added to a 188-byte TS packet, (192/188) is multiplied.

That is, the above (Equation 1) is obtained at times T0 to T1, which are read reproduction times of the common segment area.
Reproduction data buffer storage rate (bps) = (buffer input rate) − (buffer output rate)
It is a formula which shows.

After the time T1, all data read from the individual segment area of the disc is stored in the buffer, but the reproduction target data is only the data [1b] in the buffer accumulated data.
The variation data [0b] is stored in the buffer 42 read from the disk 10, but this data does not correspond to the reproduction data buffer storage amount.

From time T1 to T2, the reproduction data buffer accumulation rate (bps) is a rate according to the following equation.
−R (eb) × (192/188) (Formula 2)
That is, during this time T1 to T2, data [0b] that is not reproduced is input to the buffer, and the buffer input rate of the reproduction target data is equal to 0,
(Expression 2) in which (buffer input rate) = R (UD) is omitted is an expression indicating the reproduction data buffer accumulation rate (bps) at times T1 to T2.

In addition, from time T2 to T3, the reproduction data buffer accumulation rate (bps) is a rate according to the following equation.
R (UD) −R (eb) × (192/188) (Formula 3)
This formula is the same as the above (Formula 1).
That is, at this time T2 to T3, the data [1b] to be reproduced is input to the buffer, the buffer input rate of the reproduction target data is R (UD), and the above (expression 3), which is the same as the above (expression 1), This is an expression indicating the reproduction data buffer accumulation rate (bps) at times T2 to T3.

As shown in the figure, the period from time T1 to T6 is a period in which the reproduction data buffer accumulation amount decreases.
This means that the amount of playback data output from the buffer will be larger than the playback target data input to the buffer. If this decreasing trend continues, an underflow will occur where the playback target data stored in the buffer disappears. Playback will stop.

The average buffer accumulation rate from time T1 to T6 can be expressed by the following (Equation 4).
((S (IS) / 2) -6144) / (S (IS) -6144)) × R (UD) −R (eb) × (192/188) (Formula 4)

In the above (Formula 4),
S (IS) is the data size (bytes) of the individual segment area.
6144 is the data size (byte) of one aligned unit.

(S (IS) / 2) -6144) subtracts the data size of one aligned unit from time T6 to T7 (6144 bytes) from 1/2 of the data size from time T1 to T7 shown in the figure. It is the amount of data.
(S (IS) -6144) is a data amount obtained by subtracting the data size (6144 bytes) of one aligned unit from time T6 to T7 from the data size at time T1 to T7 shown in the figure.
((S (IS) / 2) -6144) / (S (IS) -6144)) × R (UD) is the data to be reproduced with respect to the buffer at time T1 to T6, that is, the input rate of variation data [1b]. Equivalent to.

In addition, the period of time T0-T1 shown in FIG. 7 is a period which is inputting the data of a common segment area | region into a buffer, This time (S (second)) is
(S (CS) x 8) / R (UD)
It becomes.
In addition,
S (CS) is the data size (bytes) of the common segment area.
8 is a multiplication coefficient for converting the amount of byte data into the amount of bit data.

Moreover, the period of time T1-T6 shown in FIG. 7 is a period which is inputting the data of an individual segment area | region into the buffer, This time (S (second)) is
((S (IS) -6144) × 8) / R (UD)
It becomes.

In order not to cause an underflow in which the data to be reproduced in the data buffer 42 is deficient, the reproduction data buffer accumulation amount starts to decrease as shown in FIG. It is 0 or more.
When this condition is expressed by an equation, it can be expressed as the following (Equation 5) as shown in FIG.

In addition, each parameter shown in (Formula 5) is as follows.
R (UD): Data reading rate (bps (bit / second)) from the disk 10 by the disk drive 41 in the configuration of FIG.
R (eb): Effective playback rate, and execution of a determination target ATS (arrival time stamp) section (ATS (start) to ATS (end)) in which the determination according to the conditional expression (formula 5) is performed Playback rate (bps),
N (SPCS): the number of source packets in the common segment area in the determination target ATS section (ATS (start) to ATS (end)),
N (SPIS): The number of source packets in the individual segment area in the determination target ATS section (ATS (start) to ATS (end)).
S (CS): the size (bytes) of the common segment area in the determination target ATS section (ATS (start) to ATS (end)),
S (IS): the size (bytes) of the individual segment area in the determination target ATS section (ATS (start) to ATS (end)),

In (Formula 5),
(× 8) is a multiplication process for converting the number of bytes into bit data.
(6144) is the number of bytes in the aligned unit. The data size corresponds to one individual segment in the individual segment area.
In the formula of R (eb),
270000 is a value for converting a time stamp set at 27 MHz into seconds (s).
188 × 8 is a value for converting the number of bytes of the TS packet into bit data.

(−32) is a process of subtracting the number of source packets corresponding to one aligned unit in the T6 to T7 section shown in FIG. In the example shown in FIG. 7, the input packet (1b) at times T6 to T7 is data to be reproduced, and the decreasing tendency of the data to be reproduced in the buffer stops at time T6.
The time T6 is the time when the reproduction symmetrical data in the buffer is reduced most, and the above (Formula 5) is a calculation formula with the time T6 position as the determination target position.

  The above (Expression 5) can be further expanded as shown in FIG. 9, and the following (Expression 6) can be derived as a result of the expansion process.

The inequality shown in (Expression 6) above indicates that the straight line A indicating the transition of the average buffer accumulation amount from time T0 to time T7 is always in the + position in the buffer accumulation amount transition graph shown in FIG. It is.
That is, if the above (Formula 6) is satisfied, the buffer underflow does not occur.
Note that lb of R (lb) means a local bit rate. R (lb) corresponds to the recording bit rate of a partial section (local section) constituting the content.

Note that the example described with reference to FIGS. 7 to 10 has been described as an example of processing for reproducing only the data [1b] from the individual segment area shown in FIG.
Next, with reference to FIG. 11 and subsequent figures, an example of processing for reproducing only data [0b] from the individual segment area will be described.

The graph shown in FIG. 11 is a graph showing the time transition of the accumulation amount of the reproduction target data accumulated in the data buffer 42 in the information processing apparatus shown in FIG. 6, similarly to the graph shown in FIG.
The horizontal axis is the time axis, and the vertical axis indicates the buffer accumulation amount of the reproduction target data accumulated in the data buffer 42.

Note that the content to be played back is content that includes the common segment area and the individual segment areas described with reference to FIG.
The reproduction data buffer accumulation amount on the vertical axis is
(A) data read from the common segment area;
(B) Reproduction target data selected according to the reproduction path of the reproduction apparatus among the data read from the individual segment area,
It corresponds to these data accumulation amounts.
That is, the accumulated amount of data not to be reproduced in the individual segment area is not included.

At time T0 to T1, data read from the common segment area of the disc is stored in the buffer. These read data are all reproduction target data.
From time T1 to T7, all the data read from the individual segment area of the disc is stored in the buffer, but the reproduction target data is only the data [0b] among these buffer accumulated data.
In the example illustrated in FIG. 11, it is assumed that the playback path associated with the playback device is a path for selecting and playing back only the variation data [0b].
Therefore, the variation data [1b] is accumulated in the buffer 42 read from the disk 10, but this data is not equivalent to the reproduction data buffer accumulation amount.

The reproduction data buffer accumulation rate (bps) at times T0 to T1 and T1 to T2 is a rate according to the following equation.
R (UD) -R (eb) × (192/188) (Expression 7)

R (eb) is an effective rate, and R (TS) described with reference to FIG. 6 is a rate equal to the reproduction rate.
This corresponds to the playback rate of a 188-byte TS packet.

As described with reference to FIG. 6, R (UD) is a buffer input data rate inputted from the disk 10 to the data buffer 42, and is a data reading rate from the disk.
R (eb) × (192/188) is a buffer output data rate output from the data buffer 42 to the source packet analysis unit 43.
As described with reference to FIG. 5, since the source packet has a 192-byte configuration in which a 4-byte header is added to a 188-byte TS packet, (192/188) is multiplied.

That is, the above (Equation 7) is obtained by the time T0 to T1 that is the read / reproduction time of the common segment area and the time T1 to T2 that is the read / reproduction time of the first reproduction target data [0b] in the individual segment area
Reproduction data buffer storage rate (bps) = (buffer input rate) − (buffer output rate)
It is a formula which shows.

After time T1, all the data read from the individual segment area of the disc is stored in the buffer, but the reproduction target data is only the data [0b] in the buffer accumulated data.
The variation data [1b] is stored in the buffer 42 read from the disk 10, but this data does not correspond to the reproduction data buffer storage amount.

From time T2 to T3, the reproduction data buffer accumulation rate (bps) is a rate according to the following equation.
−R (eb) × (192/188) (Equation 8)
That is, at this time T2 to T3, data [1b] that is not reproduced is input to the buffer, and the buffer input rate of the reproduction target data becomes equal to 0.
(Expression 8) in which (buffer input rate) = R (UD) is omitted is an expression indicating the reproduction data buffer accumulation rate (bps) at times T1 to T2.

In addition, from time T3 to T4, the reproduction data buffer accumulation rate (bps) is a rate according to the following equation.
R (UD) -R (eb) × (192/188) (Equation 9)
This equation is the same as the above (Equation 7).
That is, at this time T3 to T4, the data [0b] to be reproduced is input to the buffer, the buffer input rate of the reproduction target data is R (UD), and the above (Expression 9) same as (Expression 7) is The reproduction data buffer accumulation rate (bps) from time T3 to T4 is obtained.

The period from time T2 to T7 is a period in which the reproduction data buffer storage amount decreases as shown in the figure.
This means that the amount of playback data output from the buffer will be larger than the playback target data input to the buffer. If this decreasing trend continues, an underflow will occur where the playback target data stored in the buffer disappears. Playback will stop.

The average buffer accumulation rate from time T2 to T7 can be expressed by the following (Equation 10).
((S (IS) / 2) -6144) / (S (IS) -6144)) × R (UD) −R (eb) × (192/188) (Equation 10)

In (Equation 10) above,
S (IS) is the data size (bytes) of the individual segment area.
6144 is the data size (byte) of one aligned unit.

(S (IS) / 2) -6144) subtracts the data size (6144 bytes) of one aligned unit from time T1 to T2 from 1/2 of the data size from time T1 to T7 shown in the figure. It is the amount of data.
(S (IS) -6144) is a data amount obtained by subtracting the data size (6144 bytes) of one aligned unit from time T1 to T2 from the data size at time T1 to T7 shown in the figure.
((S (IS) / 2) -6144) / (S (IS) -6144)) × R (UD) is the data to be reproduced with respect to the buffer at time T2 to T7, that is, the input rate of variation data [0b]. Equivalent to.

Note that the period of time T0 to T2 shown in FIG. 11 is a period during which the first reproduction data 0b of the common segment area and the individual segment area and these data are input to the buffer, and this time (S (seconds)). )
(S (CS) +6144) × 8) / R (UD)
It becomes.
In addition,
S (CS) is the data size (bytes) of the common segment area.
6144 is the data size (bytes) of the first reproduction data 0b in the individual segment area.
8 is a multiplication coefficient for converting the amount of byte data into the amount of bit data.

Further, a period of time T2 to T7 shown in FIG. 11 is a period in which data after the first reproduction data 0b of the individual segment area is input to the buffer, and this time (S (second)) is
((S (IS) -6144) × 8) / R (UD)
It becomes.

In order to prevent the occurrence of an underflow in which the data to be reproduced in the data buffer 42 is deficient, the reproduction data buffer accumulation amount starts to decrease as shown in FIG. It is 0 or more.
When this condition is expressed by an expression, it can be expressed as the following (Expression 11) as shown in FIG.

The parameters shown in (Equation 11) are as follows.
R (UD): Data reading rate (bps (bit / second)) from the disk 10 by the disk drive 41 in the configuration of FIG.
R (eb): Effective playback rate (execution rate), and execution of a determination target ATS (arrival time stamp) section (ATS (start) to ATS (end)) for performing determination according to the conditional expression (formula 11) Playback rate (bps),
N (SPCS): the number of source packets in the common segment area in the determination target ATS section (ATS (start) to ATS (end)),
N (SPIS): The number of source packets in the individual segment area in the determination target ATS section (ATS (start) to ATS (end)).
S (CS): the size (bytes) of the common segment area in the determination target ATS section (ATS (start) to ATS (end)),
S (IS): the size (bytes) of the individual segment area in the determination target ATS section (ATS (start) to ATS (end)),

In (Equation 11),
(× 8) is a multiplication process for converting the number of bytes into bit data.
(6144) is the number of bytes in the aligned unit. The data size corresponds to one individual segment in the individual segment area.
In the formula of R (eb),
270000 is a value for converting a time stamp set at 27 MHz into seconds (s).
188 × 8 is a value for converting the number of bytes of the TS packet into bit data.

  The time T7 is the time when the reproduction symmetrical data in the buffer is reduced most, and the above (formula 11) is a calculation formula with the time T7 position as the determination target position.

  The above (Expression 11) can be further expanded as shown in FIG. 13, and the following (Expression 12) can be derived as a result of the expansion process.

The inequality shown in the above (formula 12) indicates that the straight line A indicating the transition of the average buffer accumulation amount from time T0 to T7 is always in the + position in the buffer accumulation amount transition graph shown in FIG. It is.
That is, if the above (Formula 12) is satisfied, the buffer underflow does not occur.

  It should be noted that UHD-BD (Blu-Ray (registered trademark)) discs that store ultra-high definition (UHD) images have discs that support various read rates [R (UD)]. According to the disc type, a maximum recording rate [MaxR (TS): Maximum TS Recording rate (bps)] is defined as shown in FIG.

When data recording processing is performed on a disc, the recording data is required to be set to a maximum recording rate [MaxR (TS)] or less.
By setting the recorded content below the maximum recording rate [MaxR (TS)], normal content reproduction is guaranteed.
That is, when content reproduction is performed in the information processing apparatus that performs content reproduction shown in FIG. 6, it is possible to perform content reproduction without causing a situation in which data to be reproduced disappears in the data buffer 42 during reproduction. It becomes.

A content creator or a person who performs a content recording process on a disc can confirm that the produced content or recorded content is set to a maximum recording rate [MaxR (TS)] or less and perform content production or recording processing. Necessary.
The formula for calculating the content recording rate (bps (bit / second)) can be expressed as the following formula (Formula 13).

The above (Formula 13) is a predetermined section of the content, specifically,
It is a formula for calculating a recording rate in a predetermined section (ATS (start) to ATS (end)) of a time stamp (ATS: Arbitrary Time Stamp) set in the header of the TS packet.
In the above formula,
270000 is a value for converting a time stamp set at 27 MHz into seconds (s).
188 × 8 is a value for converting the number of bytes of the TS packet into bit data.

The recording rate of an arbitrary section of the disc recording content is calculated by the above (Formula 13).
However, it is difficult to confirm whether or not the maximum recording rate [MaxR (TS)] or less is set for all parts of the content.

[4. Processing for determining whether the content satisfies the specified maximum recording rate]
As described above, UHD-BD (Blu-Ray (registered trademark)) disks that store ultra-high definition (UHD) images include disks that support various read rates [R (UD)]. According to the disc type, the maximum recording rate [MaxR (TS): Maximum TS Recording rate (bps)] is specified as shown in FIG.

A configuration for efficiently confirming that the content recorded on the disc is content satisfying the rules shown in FIG. 15 will be described below.
Specifically, a process for determining whether or not the content recording rate is recorded at a recording rate equal to or lower than the maximum recording rate [MaxR (TS): Maximum TS Recording rate (bps)] shown in FIG.

  In the content having the common segment area and the individual segment area described with reference to FIG. 1, the individual segment area is a reproduction area for performing selective data acquisition in the reproduction device. At the time of data reading and reproduction of the individual segment area, As described with reference to FIG. 7, the reproduction target data in the buffer is reduced.

By setting the data recording rate of the individual segment area for reproducing only part of the read data higher than that for the common segment area for reproducing all the read data, it is possible to prevent the buffer storage data from being depleted. However, if the data recording rate of the individual segment area is set too high, the UHD-BD specification described with reference to FIG. 15 may be exceeded.
In other words, the content recording rate may exceed the maximum recording rate [MaxR (TS)] shown in FIG.

With reference to FIG. 16, an embodiment for efficiently confirming that the disc recording content is content satisfying the rules shown in FIG. 15 will be described.
As shown in FIG. 16, a recording bit rate determination area is defined as an area composed of the entire individual segment area and a part of the common segment area preceding the individual segment area.

The recording bit rate R (lb) in the recording bit rate determination area is compared with the maximum recording rate [MaxR (TS)] defined in FIG.
Note that lb of R (lb) means a local bit rate. R (lb) corresponds to the recording bit rate of a partial section (local section) constituting the content.

The local bit rate R (lb) is compared with the maximum recording rate [MaxR (TS)] of the UHD-BD standard,
R (lb) ≦ MaxR (TS) (Formula 14)
It is determined whether or not (Equation 14) is satisfied.

  If this (Formula 14) is satisfied, it can be determined that this disc recorded content satisfies the UHJD-BD standard shown in FIG. This is the fact that the individual segment area is an area in which overlapping image data for selective data reproduction is recorded, and is an area in which high-density data is recorded compared to a common segment area that is not a selective reproduction area. It is based on.

As shown in FIG. 16, the bit rate determination area is composed of one entire individual segment area and a part of the common segment area preceding the individual segment area.
The minimum size of the common segment area set in the bit rate determination area can be determined according to the key switching time in the playback apparatus.

The playback device executes a key switching process when shifting from data playback in the common segment area to data playback in the individual segment area.
That is,
(1) A key (CPS unit key) applied to decrypting the encrypted data in the common segment area,
(2) Key (segment key) applied to decryption of encrypted data in the individual segment area,
This key switching process is performed.

  The CPS unit key, which is a key applied to decrypting the encrypted data in the common segment area, is a common key in each playback device, but the segment key applied to decrypting the encrypted data in the individual segment area is The key is different depending on the playback path set in the playback device.

The minimum size of the common segment area included in the bit rate determination area is a reproduction data size corresponding to the content reproduction time required for the key switching process.
That is, the bit rate determination area is
(A) an entire individual segment area;
(B) Among the common segment areas preceding the individual segment area, a common segment area having a data size equal to or larger than the data size corresponding to the content playback time required for the key switching process,
The data area (a) + (b) is set as a bit rate determination area.

A plurality of individual segment areas are set in the disc recorded content.
The bit rate determination process is performed for all the individual segment areas included in the content.
That is, all the areas (a) + (b) included in the content are extracted and set as bit rate determination areas.

All the comparison processing between the extracted local bit rate R (lb) in the bit rate determination area and the maximum recording rate [MaxR (TS)] of the UHD-BD standard is executed.
R (lb) ≦ MaxR (TS) (Formula 14)
It is determined whether or not (Equation 14) is satisfied.

When the above (Formula 14) is satisfied for all the extraction areas, it is determined that this disc recorded content satisfies the UHD-BD standard shown in FIG.
If even one of the extraction areas does not satisfy the above (Formula 14), it is determined that this disc recording content does not satisfy the UHD-BD standard shown in FIG.

As described above, an area including all the individual segment areas predicted to have a high recording rate and including the common segment area in front of the individual segment area in consideration of the key change processing time is used as a bit rate determination area. Comparison processing with the maximum recording rate [MaxR (TS)] of the BD standard is executed.
With this processing, it is possible to determine whether or not the entire disc recorded content satisfies the UH-BD standard. That is, it is possible to efficiently determine whether or not the disc recording content is a standard-compliant content.

  Note that the data processing unit of the information processing device that generates content uses a region including the common segment region in front of the individual segment region as a bit rate determination region, and the local bit rate R (lb) of the bit rate determination region is set in advance. Content having a setting equal to or less than the specified maximum recording rate [MaxR (TS)] is generated.

The size of a part of the common segment area included in the bit rate determination area is determined based on the decryption key for the encrypted data in the individual segment area from the decryption key for the encrypted data in the common segment area executed by the playback device. The size is determined based on the key switching processing time for the key.
Note that the content is a content made up of Ultra High Definition (UHD) images, and the maximum recording rate [MaxR (TS)] is a disc-compatible standard for storing ultra-high definition (UHD) image content. .

[5. About judgment processing of divided and recorded content]
When content is recorded on a disc, the playback data is not necessarily recorded continuously on the disc. In some cases, data is divided in the middle and recorded at a separated position on the disk. When reproducing such divided recording contents, the reproducing apparatus needs to jump the pickup on the disc and reproduce it. That is, data reproduction is performed by jumping between the divided and recorded data.

FIG. 17 shows an example of content that is divided and recorded.
FIG. 17A shows an AV stream file to be recorded on the disc.
FIG. 17B shows an example when the AV stream file of FIG. 17A is recorded on a disc.

(A) The AV stream file is a continuous data file.
(B) In the data recording layout on the disc, the AV stream file is divided and recorded in some places. this is. This is due to various factors such as defective segments on the disk.
In the data configuration of FIG. 17B, the portion described as “jump” is an area where no AV stream file is recorded, and is a content division position.
When reproducing the content divided in this way, the reproduction device performs reproduction by causing the pickup to “jump” in the “jump” area shown in the figure.

  In this way, when playback accompanied by jump processing is performed, data input to the buffer (data buffer 42 shown in FIG. 6) is interrupted during the “jump” period. As a result, the reproduction target data in the buffer is reduced during the jump period.

Note that data recording on the disc may be performed over a plurality of layers. In the case of the recorded content over a plurality of layers, an interlayer jump is executed at the time of content reproduction.
FIG. 18 shows a configuration example of recorded contents over a plurality of layers (layer 0 (L0) and layer 1 (L1)) and an example of interlayer jump.

For content that may cause jump processing as described above, the following constraints are defined as constraints when content is recorded on a disc.
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is not less than the minimum size of the common segment area described above. That is, the size is equal to or larger than the reproduction data size corresponding to the content reproduction time required for the key switching process.

Content is recorded on the disc so as to satisfy this constraint.
The bit rate determination process described above is performed on the content recorded on the disc in accordance with these restrictions.
That is, the bit rate determination process is
(A) an entire individual segment area;
(B) Among the common segment areas preceding the individual segment area, a common segment area having a data size equal to or larger than the data size corresponding to the content playback time required for the key switching process,
The data area (a) + (b) is executed as a bit rate determination area.

For all individual segment areas included in the content,
Extracting the area (a) + (b) above,
A comparison process is executed between the local bit rate R (lb) and the maximum recording rate [MaxR (TS)] of the UHD-BD standard.
R (lb) ≦ MaxR (TS) (Formula 14)
It is determined whether or not (Equation 14) is satisfied.

When the above (Formula 14) is satisfied for all the extraction areas, it is determined that this disc recorded content satisfies the UHD-BD standard shown in FIG.
If even one of the extraction areas does not satisfy the above (Formula 14), it is determined that this disc recording content does not satisfy the UHD-BD standard shown in FIG.

In this way, even if the content is divided in the middle of the data and recorded on the disc,
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is not less than the minimum size of the common segment area described above.
For content recorded in compliance with these restrictions, the disc recorded content satisfies the UHD-BD standard shown in FIG. 15 only by performing bit rate determination processing on the specific bit rate determination area described above. It can be determined whether or not.

In addition, as described above, the area that is the target of the bit rate determination process is
(A) an entire individual segment area;
(B) Among the common segment areas preceding the individual segment area, a common segment area having a data size equal to or larger than the data size corresponding to the content playback time required for the key switching process,
This is the data area (a) + (b).

By this processing, even when the content has a divided area and it is necessary to execute jump processing at the time of reproduction, the above-described simple bit rate determination processing is performed by recording the content on the disc in accordance with the above restrictions. Can be applied.
That is, the simple bit rate determination process described above makes it possible to determine whether or not the entire disc recording content satisfies the UH-BD standard, and whether or not the disc recording content is a standard-compliant content can be efficiently determined. Can be determined automatically.

Note that the data processing unit of the information processing apparatus that executes the process of generating content and recording it on the disc has the following restrictions when recording the recorded content separately when recording the generated content on the disc:
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is a key from the decryption key for the encrypted data in the common segment area executed by the playback device to the decryption key for the encrypted data in the individual segment area. More than the playback data size corresponding to the switching processing time,
A process of recording as a setting satisfying the above constraints is executed.
That is, an area including a common segment area in front of the individual segment area is defined as a bit rate determination area, and the local bit rate R (lb) of the bit rate determination area is equal to or less than a predetermined maximum recording rate [MaxR (TS)]. Generate the content to be set for.

The size of a part of the common segment area included in the bit rate determination area is determined based on the decryption key for the encrypted data in the individual segment area from the decryption key for the encrypted data in the common segment area executed by the playback device. The size is determined based on the key switching processing time for the key.
Note that the content is a content made up of Ultra High Definition (UHD) images, and the maximum recording rate [MaxR (TS)] is a disc-compatible standard for storing ultra-high definition (UHD) image content. .

[6. Processing sequence executed by information processing apparatus]
Next, a sequence of content generation / recording processing and content reproduction processing having the above settings will be described with reference to FIG.
FIG. 19 shows, from the left, a recording device (Replicator) 50, an information recording medium (disc (BD-ROM)) 60 for recording content, and a playback device (Player) 70.

First, content recording processing executed by the recording device (Replicator) 50 will be described.
The recording device 50 records the following data on the information recording medium 60.
MKB (Media Key Block) 51,
KCD (Key Conversion Data) 52,
uMKB (unified-Media Key Block) 53,
Volume ID 54,

An MKB (Media Key Block) 51, a KCD (Key Conversion Data) 52, and a uMKB (Unified-Media Key Block) 53 apply a device key set (Set of Device Keys) 71 held by the playback device. It is composed of data such as a key used for obtaining reproduction path information unique to 70.
The volume ID (volume ID) 54 is, for example, an identifier that is set in correspondence with content corresponding to a specific title, and is data that is applied to the segment key and CPS unit key calculation in the playback device 70.

First, in step S11, the recording device 50 encrypts the CPS unit key file storing the CPS unit key applied to decrypt the common segment area and the segment key storing the segment key applied to decrypt the individual segment area. Generate an encryption key to apply to decrypting the file.
AES_G, AES_E, and AES_D shown in the figure indicate data (random number etc.) generation processing, encryption processing, and decryption processing according to the AES encryption algorithm, respectively.

  The encryption key of the CPS unit key file is generated by the volume ID 54 and the media key (Media Key) 55-1. The encryption key of the segment key file is generated by using the volume ID 54 and a media key variant (Media Key Variant) 55-2.

  In the segment key file storing the segment key, keys corresponding to all the variation data set in each individual segment area are stored as encrypted data. The media key variant (Media Key Variant) 55-2 is different data corresponding to each variation data, and uses this data to generate different encryption keys to be applied to each segment key.

In step S12, the recording device 50 performs encryption of the CPS unit key file 56-1 and encryption of the segment key file 56-2, and records them on the information recording medium 60.
Furthermore, in step S13, the CPS unit key acquired from the CPS unit key file 56-1 and the segment key acquired from the segment key file 56-2 for the AV stream 57 constituted by content such as a movie, for example. By applying the encryption process to the common segment area and the individual segment area, encrypted content (Encrypted AV Stream) is generated and recorded in the information recording medium 60.

The following data is recorded on the information recording medium 60.
MKB (Media Key Block) 61,
KCD (Key Conversion Data) 62,
uMKB (unified-Media Key Block) 63,
Volume ID (volume ID) 64,
CPS unit key file & segment key file 65,
Encrypted content (Encrypted AV Stream) 66,

Next, the processing of the playback device (Player) 70 will be described.
The playback device 70 stores a device key set (Set of Device Keys) 71 unique to the playback device in a memory.
The device key set (Set of Device Keys) 71 can have various settings such as different settings depending on the type of device, manufacturer, etc., or different settings for each device.

The playback device 70, in steps S21 to S23,
Device key set 71 (Set of Device Keys)
The following data recorded on the information recording medium 60, that is,
MKB (Media Key Block) 61,
KCD (Key Conversion Data) 62,
uMKB (unified-Media Key Block) 63,
A process using each of these data is executed to obtain reproduction path information.
This reproduction path information is a different path according to a device key set (Set of Device Keys) 71 held by the reproduction apparatus.

The reproduction path information generated in step S23 is information indicating variation data to be selectively reproduced in each individual segment area. For example, it is information indicating variation data to be selected and reproduced in each individual segment area, and is configured by data in which identifiers of variation data to be selected and reproduced in the individual segment area are set as follows.
Individual segment 1: Variation data identifier AV002
Individual segment 2: Variation data identifier AV001
Individual segment 3: Variation data identifier AV003
Individual segment 4: Variation data identifier AV002
::

Next, in steps S24 to S25, the playback device 70 calculates a key necessary for decrypting the segment area data in accordance with the playback path information.
That is, a CPS unit key applied to decrypting the common segment region configuration data and a segment key applied to decrypting one variation data in the individual segment region are calculated.

For the key calculation, the following data acquired from the disk 60 are used.
Volume ID (volume ID) 64,
CPS unit key file & segment key file 65,
The segment key file 65 stores a segment key that is applied to decrypt all the variation data included in the individual segment area, encrypted with an individual encryption key. The segment key that can be acquired (decoded) by one playback apparatus 70 is only one segment key for one individual segment area. That is, only one segment key applied to decrypting one variation data selected according to the reproduction path information can be acquired (decrypted).
This differs depending on the device key set 71 stored in the playback device 70.

Next, in step S26, the playback device 70 reads the encrypted content 66 from the disc, executes decryption processing using the CPS unit key and the segment key, generates decrypted content (AV Stream), and performs playback processing. Execute.
In this way, the playback device 70 plays back the content according to the playback path unique to the playback device.

[7. Regarding hardware configuration example of information processing device]
Next, an example of the hardware configuration of an information processing apparatus that executes content reproduction processing, content generation processing, recording processing, and verification processing having the configuration described in the above-described embodiment will be described with reference to FIG. .

  A CPU (Central Processing Unit) 501 functions as a data processing unit that executes various processes according to a program stored in a ROM (Read Only Memory) 502 or a storage unit 508. For example, processing according to the sequence described in the above-described embodiment is executed. A RAM (Random Access Memory) 503 stores programs executed by the CPU 501, data, and the like. The CPU 501, ROM 502, and RAM 503 are connected to each other by a bus 504.

  The CPU 501 is connected to an input / output interface 505 via a bus 504. The input / output interface 505 is connected to an input unit 506 including various switches, a keyboard, a mouse, and a microphone, and an output unit 507 including a display and a speaker. Yes. The CPU 501 executes various processes in response to a command input from the input unit 506 and outputs a processing result to the output unit 507, for example.

  A storage unit 508 connected to the input / output interface 505 includes, for example, a hard disk and stores programs executed by the CPU 501 and various data. The communication unit 509 functions as a data transmission / reception unit via a network such as the Internet or a local area network, and further as a broadcast wave transmission / reception unit, and communicates with an external device.

  The drive 510 connected to the input / output interface 505 drives a removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory such as a memory card, and executes data recording or reading.

  Data encoding or decoding can be executed as processing of the CPU 501 as a data processing unit, but a configuration including a codec as dedicated hardware for executing encoding processing or decoding processing may be employed.

[8. Summary of composition of the present disclosure]
As described above, the embodiments of the present disclosure have been described in detail with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the gist of the present disclosure. In other words, the present invention has been disclosed in the form of exemplification, and should not be interpreted in a limited manner. In order to determine the gist of the present disclosure, the claims should be taken into consideration.

The technology disclosed in this specification can take the following configurations.
(1) having a data processing unit for generating disc recording content;
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing apparatus that generates content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].

  (2) The size of a partial area of the common segment area included in the bit rate determination area is determined based on the encrypted data in the individual segment area from the decryption key of the encrypted data in the common segment area executed in the playback device. The information processing apparatus according to (1), wherein the size is determined based on a key switching processing time to the decryption key.

  (3) The individual segment area is a data area configured by a plurality of variation data of two or more, and is an area including variation data selected according to a playback path determined according to a playback device (1) or The information processing apparatus according to (2).

  (4) The content is a content made up of an ultra high definition (UHD) image, and the maximum recording rate [MaxR (TS)] is compatible with a disc storing ultra high definition (UHD) image content. The information processing apparatus according to any one of (1) to (3), which is a standard.

(5) The data processing unit
When recording the generated content on the disc when recording the divided content, the following restrictions are applied:
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is a key from the decryption key for the encrypted data in the common segment area executed by the playback device to the decryption key for the encrypted data in the individual segment area. More than the playback data size corresponding to the switching processing time,
The information processing apparatus according to any one of (1) to (4), wherein the information is recorded as a setting that satisfies the restriction.

  (6) The information processing apparatus according to any one of (1) to (5), wherein each of the variation data is configured by segmented data in units of aligned units.

(7) having a data processing unit for executing verification processing of content for disc recording;
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing apparatus that executes a process of determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

  (8) The size of a partial area of the common segment area included in the bit rate determination area is determined based on the encrypted data in the individual segment area from the decryption key of the encrypted data in the common segment area executed in the playback device. (7) The information processing apparatus according to (7), wherein the size is determined based on a key switching processing time to the decryption key.

(9) Different identification information is embedded in each, and each has a segment segment composed of a plurality of variation data that can be decrypted with a different key, and a common segment region composed of a single data,
An information recording medium in which content capable of setting a plurality of playback paths according to variation data to be selected is stored as recording data.
The content is
A local bit rate R (lb) of a bit rate determination area consisting of one individual segment area and a partial area of the common segment area preceding the individual segment area is a predetermined maximum recording rate [MaxR (TS)]. An information recording medium that is content with the following settings.

  (10) The size of a partial area of the common segment area included in the bit rate determination area is determined based on the encrypted data in the individual segment area from the decryption key of the encrypted data in the common segment area executed in the playback device. (9) The information recording medium according to (9), wherein the size is determined based on the key switching processing time to the decryption key.

  (11) The individual segment area is a data area configured by a plurality of variation data of two or more, and is an area including variation data selected according to a reproduction path determined according to a reproduction apparatus (9) or (10) The information recording medium according to (10).

  (12) The content is a content composed of an ultra high definition (UHD) image, and the maximum recording rate [MaxR (TS)] is compatible with a disc storing ultra high definition (UHD) image content. The information recording medium according to any one of (9) to (11), which is a standard.

(13) The information recording medium has a configuration in which the recorded content is divided and recorded,
The following constraints:
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is a key from the decryption key for the encrypted data in the common segment area executed by the playback device to the decryption key for the encrypted data in the individual segment area. More than the playback data size corresponding to the switching processing time,
The information recording medium according to any one of (9) to (12), having a recording content set to satisfy the above restrictions.

  (14) The information recording medium according to any one of (9) to (13), wherein each of the variation data is configured by segmented data in an aligned unit unit.

(15) An information processing method executed in the information processing apparatus,
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing method for generating content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].

(16) An information processing method executed in the information processing apparatus,
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing method for executing a process of determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

(17) A program for executing information processing in an information processing device,
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
A program for generating content in which the local bit rate R (lb) of each bit rate determination area in the content is set to a value equal to or less than a predetermined maximum recording rate [MaxR (TS)].

(18) A program for executing information processing in an information processing device,
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
A program for executing a process for determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

  The series of processing described in the specification can be executed by hardware, software, or a combined configuration of both. When executing processing by software, the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run. For example, the program can be recorded in advance on a recording medium. In addition to being installed on a computer from a recording medium, the program can be received via a network such as a LAN (Local Area Network) or the Internet and can be installed on a recording medium such as a built-in hard disk.

  Note that the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Further, in this specification, the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.

As described above, according to the configuration of an embodiment of the present disclosure, content that does not cause a reproduction error due to a buffer underflow when content having an individual segment area composed of selected reproduction data corresponding to a reproduction path is efficiently generated. Can be generated automatically.
Specifically, different identification information is embedded in each, and content having individual segment areas composed of a plurality of variation data that can be decrypted with different keys and a common segment area composed of a single data is generated. A data processing unit that generates content uses a local area of each bit rate determination area in the content as an area composed of one individual segment area and a partial area of a common segment area preceding the individual segment area. Content with a bit rate R (lb) set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)] is generated.
With this configuration, it is possible to efficiently generate content that does not cause a reproduction error due to buffer underflow when content having an individual segment area composed of selected reproduction data corresponding to the reproduction path is reproduced.

DESCRIPTION OF SYMBOLS 10 Information recording medium 21, 22 Playback apparatus 31, 32 Playback image 41 Disk drive 42 Data buffer 43 Source packet analysis part 44 Clock information supply part 45 TS packet decoding part 50 Recording apparatus 60 Information recording medium 70 Playback apparatus 501 CPU
502 ROM
503 RAM
504 Bus 505 I / O interface 506 Input unit 507 Output unit 508 Storage unit 509 Communication unit 510 Drive 511 Removable media

Claims (18)

A data processing unit for generating disc recording content;
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing apparatus that generates content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)].   The size of the partial area of the common segment area included in the bit rate determination area is for decrypting the encrypted data in the individual segment area from the decryption key for the encrypted data in the common segment area executed in the playback device. The information processing apparatus according to claim 1, wherein the size is determined based on a key switching processing time to a key.   2. The information according to claim 1, wherein the individual segment area is a data area composed of a plurality of variation data of two or more, and includes variation data selected according to a reproduction path determined according to a reproduction apparatus. Processing equipment.   The content is a content consisting of an ultra high definition (UHD) image, and the maximum recording rate [MaxR (TS)] is a disc-compatible standard for storing an ultra high definition (UHD) image content. The information processing apparatus according to claim 1. The data processing unit
When recording the generated content on the disc when recording the divided content, the following restrictions are applied:
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is a key from the decryption key for the encrypted data in the common segment area executed by the playback device to the decryption key for the encrypted data in the individual segment area. More than the playback data size corresponding to the switching processing time,
The information processing apparatus according to claim 1, wherein the information processing apparatus records the setting as satisfying the restriction.   The information processing apparatus according to claim 1, wherein each of the variation data includes subdivided data in an aligned unit unit. It has a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing apparatus that executes a process of determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].   The size of the partial area of the common segment area included in the bit rate determination area is for decrypting the encrypted data in the individual segment area from the decryption key for the encrypted data in the common segment area executed in the playback device. The information processing apparatus according to claim 7, wherein the size is determined based on a key switching processing time to a key. Different identification information is embedded in each, and each has a segment segment composed of a plurality of variation data that can be decrypted with a different key, and a common segment region composed of a single data,
An information recording medium in which content capable of setting a plurality of playback paths according to variation data to be selected is stored as recording data.
The content is
A local bit rate R (lb) of a bit rate determination area consisting of one individual segment area and a partial area of the common segment area preceding the individual segment area is a predetermined maximum recording rate [MaxR (TS)]. An information recording medium that is content with the following settings.   The size of the partial area of the common segment area included in the bit rate determination area is for decrypting the encrypted data in the individual segment area from the decryption key for the encrypted data in the common segment area executed in the playback device. The information recording medium according to claim 9, wherein the size is determined based on a key switching processing time to a key.   10. The information recording according to claim 9, wherein the individual segment area is a data area composed of a plurality of variation data of two or more, and includes variation data selected according to a reproduction path determined according to a reproduction apparatus. Medium.   The content is a content consisting of an ultra high definition (UHD) image, and the maximum recording rate [MaxR (TS)] is a disc-compatible standard for storing an ultra high definition (UHD) image content. The information recording medium according to claim 9. The information recording medium has a configuration in which recorded content is divided and recorded,
The following constraints:
(Constraint 1) Content division is allowed only in the common segment area.
(Constraint 2) The common segment area preceding the individual segment area is a key from the decryption key for the encrypted data in the common segment area executed by the playback device to the decryption key for the encrypted data in the individual segment area. More than the playback data size corresponding to the switching processing time,
The information recording medium according to claim 9, wherein the information recording medium has a recording content set to satisfy the restriction.   The information recording medium according to claim 9, wherein each of the variation data is configured by segmented data in an aligned unit unit. An information processing method executed in an information processing apparatus,
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing method for generating content in which the local bit rate R (lb) of each bit rate determination area in the content is set to be equal to or less than a predetermined maximum recording rate [MaxR (TS)]. An information processing method executed in an information processing apparatus,
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The data processing unit is
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
An information processing method for executing a process of determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)]. A program for executing information processing in an information processing apparatus;
The information processing apparatus has a data processing unit for generating content for disk recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
A program for generating content in which the local bit rate R (lb) of each bit rate determination area in the content is set to a value equal to or less than a predetermined maximum recording rate [MaxR (TS)]. A program for executing information processing in an information processing apparatus;
The information processing apparatus includes a data processing unit that executes verification processing of content for disc recording,
The content is content having individual segment areas each composed of a plurality of variation data, each of which is embedded with different identification information and decryptable with a different key, and a common segment area composed of a single data,
The program is stored in the data processing unit.
An area composed of one individual segment area and a partial area of the common segment area preceding the individual segment area is defined as a bit rate determination area.
A program for executing a process for determining whether or not the local bit rate R (lb) of each bit rate determination area in the content is a setting equal to or less than a predetermined maximum recording rate [MaxR (TS)].

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