JP4793305B2 - Information processing apparatus, information recording medium manufacturing method, information recording medium, and computer program - Google Patents

Description

  The present invention relates to an information processing apparatus, an information recording medium manufacturing method, an information recording medium, and a computer program. More specifically, for example, an information processing apparatus applicable to manufacture of a recording medium on which content to be reproduced is recorded by replacing a part of the content with the recording data of the conversion table in reproducing the recorded content of an information recording medium such as a DVD. The present invention relates to an information recording medium manufacturing method, an information recording medium, and a computer program.

  Audio data such as music, image data such as movies, game programs, various application programs, etc., and various software data (hereinafter referred to as “Content”) are applied to a recording medium such as a blue laser. It can be stored as digital data on a Blu-ray Disc (registered trademark), DVD (Digital Versatile Disc), MD (Mini Disc), or CD (Compact Disc). In particular, Blu-ray Disc (registered trademark) using a blue laser is a high-density recordable disc and can record a large volume of video content as high-quality data.

  Digital contents are stored in these various information recording media (recording media) and provided to users. A user plays back and uses content on a playback device such as a personal computer (PC) or disc player.

  Many contents, such as music data and image data, generally have distribution rights or the like held by the creator or seller. Therefore, when distributing these contents, it is common to adopt a configuration that restricts the use of the contents, that is, permits the use of the contents only to authorized users and prevents unauthorized copying or the like. It is the target. According to the digital recording device and the recording medium, for example, recording and reproduction can be repeated without deteriorating images and sound, and illegally copied content is distributed via the Internet, and the content is copied to a CD-R or the like. Problems such as the distribution of so-called pirated discs and the use of copy contents stored on hard disks such as PCs have become widespread.

  A large-capacity recording medium such as a DVD or a recording medium using a blue laser that has been developed in recent years can record a large amount of data, for example, one movie to several movies as digital information on one medium. Is possible. As video information and the like can be recorded as digital information in this way, it is an increasingly important issue to prevent unauthorized copying and to protect the copyright holder. In recent years, in order to prevent such illegal copying of digital data, various techniques for preventing illegal copying in digital recording devices and recording media have been put into practical use.

  As a content protection method, for example, content scramble processing and encryption processing are common. The content can be decrypted and reproduced only by the process of applying the key information given to the specific reproduction apparatus that has received the license. When the license is not received, the data cannot be reproduced because the key information is not provided. However, in such a data scramble or encryption process, there is a possibility that the content may be illegally reproduced or copied when the scramble method is decrypted or the encryption key is illegally obtained.

  As a content protection technique for solving such a problem, the applicant of the present patent application (Patent Document 1) modified a broken data, for example, a normal content, into a part of the recorded content of a recording medium such as a disc. Record the conversion data registered as replacement data (conversion data) with the correct content data to be replaced at the location of the broken data in addition to the scattered broken data. A system has been proposed in which only the player who receives the data can perform data conversion processing using the replacement data (conversion data) registered in the conversion table and reproduce the content. Furthermore, a configuration has been proposed in which a specific identifier (ID) is included in the conversion data, which is registered data in the data conversion table, so that the outflow route can be clarified even when the content flows out.

  However, in the configuration using this conversion table, a playback device that performs content playback is required to continuously execute the process of replacing broken data scattered in the content during the content playback. There is a problem that the load increases and a reproduction error may occur depending on the processing capability of the reproduction device.

  The present invention has been made in view of such a situation, and in a configuration in which content playback with data replacement is executed, a deformation area is arranged in the content in consideration of the load of the information processing apparatus that is the content playback device. Accordingly, an object of the present invention is to provide an information processing apparatus, an information recording medium manufacturing method, an information recording medium, and a computer program that can perform reliable content playback on a playback device.

The first aspect of the present invention is:
An information processing apparatus that executes information recording processing,
A conversion processing area determination unit for determining a position in the content for setting a conversion processing area for executing data conversion processing in the content reproduction processing;
A conversion table generating unit that generates a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A content including the conversion processing area; and a data recording unit that records the conversion table on an information recording medium;
The conversion processing area determination unit
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
An information processing apparatus is characterized in that a conversion process area determination process is executed so as to satisfy at least one of the first and second conversion process area setting conditions.

Furthermore, in an embodiment of the information processing apparatus according to the present invention, the conversion processing area determination unit is configured to perform a first conversion process set in correspondence with a method of recording the conversion table as a conversion table block scattered in the content. As an area setting condition,
(A) The interval between PMT (program map table) packets for storing conversion table blocks is 22 packets or more;
(B) The interval from the PMT (Program Map Table) packet storing the conversion table block to the random playback start position (SPN_EP_Start) set in the next EP map is 22 packets or more,
The conversion processing area determination process is executed so as to satisfy the above condition.

Furthermore, in one embodiment of the information processing apparatus of the present invention, the conversion processing area determination unit further includes:
(C1) A packet whose interval from the conversion table block storage PMT (program map table) packet is 11 packets or more is set as a preceding conversion processing area setting packet,
(C1) The present invention is characterized in that a packet having an interval of 11 packets or more from the preceding conversion processing area setting packet is selected as a subsequent conversion processing area setting packet and a conversion processing area determination process is executed.

  Furthermore, in one embodiment of the information processing apparatus of the present invention, the conversion processing area determination unit converts a PMT (program map table) packet storing a conversion table block into a transport packet stream (TS) storing content for 1 second. It is characterized in that the conversion process area determination process is executed so as to satisfy the condition of 50 or less per setting.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the conversion processing area determination unit sets the second conversion processing area setting condition set in correspondence with a method of recording the conversion table as data independent of the content. The conversion processing area is determined so as to satisfy the condition that a maximum of 30 deformation processing areas are set in units of 32 aligned units in which 32 aligned units as cryptographic processing units are consecutive. It is the structure which performs.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the conversion processing area determination unit further satisfies a condition that the number of bytes set in the conversion processing area per packet of the content stream is 25 bytes. The present invention is characterized in that a conversion process area determination process is executed.

Furthermore, in an embodiment of the information processing apparatus according to the present invention, the conversion processing area determination unit stores the content to be recorded on the information recording medium.
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the transformation processing having a large influence on the reproduction data is subjected to the conversion processing area determination processing so as to satisfy the condition that the conversion processing area is set as an area common to both methods (1) and (2). It is the structure to perform.

Furthermore, in one embodiment of the information processing apparatus of the present invention, the conversion processing area determination unit includes:
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
In the case of recording content that is commonly used in both methods (1) and (2), the conversion processing areas to be subjected to transformation processing with little influence on reproduction data are shown in (1) and (2) above. It is characterized in that it is determined as a conversion processing area to be applied to at least one of both methods.

Furthermore, in an embodiment of the information processing apparatus according to the present invention, the conversion processing area determination unit stores the content to be recorded on the information recording medium.
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording individual content corresponding to each of the methods shown in (1) and (2) above,
For the first content, the first conversion processing area setting condition,
For the second content, the second conversion processing area setting condition,
It is the structure which performs the determination process of the conversion process area | region so that it may satisfy separately.

Furthermore, the second aspect of the present invention provides
An information recording medium manufacturing method for manufacturing an information recording medium in an information processing apparatus,
A conversion processing region determination unit for determining a position in the content for setting a conversion processing region for executing the data conversion processing in the content reproduction processing;
A conversion table generating unit for generating a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A data recording unit includes a content including the conversion processing area, and a data recording step of recording the conversion table on an information recording medium;
The conversion processing area determination step includes:
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
The method of manufacturing an information recording medium is a step of executing a conversion processing area determination process so as to satisfy at least one of the first and second conversion processing area setting conditions.

Furthermore, in an embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determining step is set in correspondence with a method of recording the conversion table as a conversion table block scattered in the content. As conversion processing area setting conditions,
(A) The interval between PMT (program map table) packets for storing conversion table blocks is 22 packets or more;
(B) The interval from the PMT (Program Map Table) packet storing the conversion table block to the random playback start position (SPN_EP_Start) set in the next EP map is 22 packets or more,
It is a step of executing a conversion processing area determination process so as to satisfy the above condition.

Furthermore, in one embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determination step further comprises:
(C1) A packet whose interval from the conversion table block storage PMT (program map table) packet is 11 packets or more is set as a preceding conversion processing area setting packet,
(C1) A step of selecting a packet having an interval of 11 packets or more from the preceding conversion processing area setting packet as a subsequent conversion processing area setting packet and executing a conversion processing area determination process.

  Furthermore, in an embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determination step includes a transport packet stream (TS) 1 storing PMT (program map table) packets storing conversion table blocks and contents. It is a step for executing conversion processing region determination processing so as to satisfy the condition of setting 50 or less per second.

  Furthermore, in an embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determination step includes a second conversion processing area setting set in correspondence with a method of recording the conversion table as data independent of the content. As a condition, the conversion processing area is set so as to satisfy the condition that a maximum of 30 deformation processing areas are set in 32 aligned unit units in which 32 aligned units that are encryption processing units are consecutive. It is a step for executing a determination process.

  Furthermore, in one embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determination step further satisfies a condition that the number of bytes set in the conversion processing area per packet of the content composition stream is 25 bytes. As described above, this step is characterized in that it is a step of executing conversion processing region determination processing.

Furthermore, in one embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determining step includes:
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the transformation processing having a large influence on the reproduction data is subjected to the conversion processing area determination processing so as to satisfy the condition that the conversion processing area is set as an area common to both methods (1) and (2). It is a step to be executed.

Furthermore, in one embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determination step includes:
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the deformation process having little influence on the reproduction data is a step of determining as a conversion processing area to be applied only to at least one of both methods shown in the above (1) and (2). .

Furthermore, in one embodiment of the information recording medium manufacturing method of the present invention, the conversion processing area determining step includes:
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording individual content corresponding to each of the methods shown in (1) and (2) above,
For the first content, the first conversion processing area setting condition,
For the second content, the second conversion processing area setting condition,
This is a step of executing conversion processing region determination processing so as to satisfy each of the above.

Furthermore, the third aspect of the present invention provides
An information recording medium on which content is recorded,
Content that is stream data including content and has a conversion processing area that is subject to data conversion processing during playback processing;
A conversion table including conversion data as replacement data for the conversion processing area and position information of the conversion processing area;
Is an information recording medium that records
The conversion processing area is
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
A conversion processing area is set so as to satisfy at least one of the first or second conversion processing area setting conditions,
When reproducing content from an information recording medium in a playback device, the position information and conversion data of the conversion processing area are acquired from the conversion table, and the conversion processing area is detected according to the position information and the conversion data is replaced. There is an information recording medium characterized by having recording data that can be made to be recorded.

Furthermore, the fourth aspect of the present invention provides
A computer program for generating data to be recorded on an information recording medium in an information processing apparatus,
A conversion processing region determination step for causing the conversion processing region determination unit to determine a position in the content to set a conversion processing region for executing the data conversion processing in the content reproduction processing;
A conversion table generating step for causing the conversion table generating unit to generate a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A data recording unit includes a content including the conversion processing area, and a data recording step of recording the conversion table on an information recording medium,
The conversion processing area determination step includes:
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
The present invention resides in a computer program characterized in that it is a step of executing a conversion processing region determination process so as to satisfy at least one of the first and second conversion processing region setting conditions.

  The computer program of the present invention is, for example, a computer program that can be provided by a storage medium or a communication medium provided in a computer-readable format to a general-purpose 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 computer system.

  Other objects, features, and advantages of the present invention will become apparent from a more detailed description based on embodiments of the present invention described later 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 invention, a data conversion processing area composed of, for example, broken data is set in the content configuration data, and the playback data is replaced with the converted data recorded in the conversion table in the playback process. Supports the first conversion processing area setting condition set corresponding to the method of recording the conversion table as a conversion table block scattered in the content, or the method of recording the conversion table as data independent of the content The conversion processing area determination process is executed so as to satisfy at least one of the second conversion processing area setting conditions set as described above and the first or second conversion processing area setting conditions, and the recording data And an information recording medium using the contents and conversion table as recording information. The conversion process area setting conditions are set so that the processing load of the playback device that executes the playback process does not become excessive, and during playback, reliable content playback is guaranteed without causing playback errors caused by the data conversion process. Is done.

Details of the information processing apparatus, information recording medium manufacturing method, information recording medium, and computer program of the present invention will be described below with reference to the drawings. The description will be made according to the following description items.
1. 1. Reproduction processing content with data conversion Reproduction processing example of reproduction processing content accompanied by data conversion (2-1) Content reproduction processing example 1
(2-2) Content reproduction processing example 2
3. Setting example of conversion processing area in consideration of player processing (3-1) Conversion processing area setting example in a configuration in which conversion tables are distributed and recorded in content (3-2) Conversion in a configuration using a conversion table independent of content Processing area setting example 4. Content editing and information recording media manufacturing process

[1. About playback processing content with data conversion]
First, a configuration example of playback processing content accompanied by data conversion will be described. With reference to FIGS. 1-3, the structure of the content stored in an information recording medium and the outline | summary of a reproduction process are demonstrated. The information recording medium 10 is, for example, an information recording medium such as Blu-ray Disc (registered trademark) or DVD.

  The information recording medium 10 shown in FIG. 1 stores AV (Audio Visual) content such as movies. These contents are encrypted and can be reproduced by a decryption process using an encryption key generated by a key generation algorithm executed by a reproduction apparatus having a predetermined license. The content stored in the information recording medium 10 is content that requires conversion (replacement) of a part of the content data in the reproduction process. For example, a part of the content is transformed data (broken data). (Also called).

  FIG. 1 shows a configuration example of the recorded content 11 stored in the information recording medium 10. The recorded content 11 is a normal content data area 12 that is normal content data that has not been transformed, and modified data that is a data area of a modified content that has been destroyed by a modification that requires data conversion (replacement) during reproduction. (Broken data) 13.

  The modified data 13 is data obtained by performing a modification process (or a destruction process) on at least a part of the content configuration data by a predetermined data process on the original content. Accordingly, when the content 11 including the modified data 13 is reproduced as it is, normal content reproduction cannot be performed.

  In order to perform content playback, it is necessary to generate the playback content 20 by performing a process of replacing the modified data 13 included in the recorded content 11 with normal content data. Data for conversion as normal content data corresponding to each modified data (broken data) 13 is registered in a conversion table (FUT (Fix-Up Table)) 15 recorded in the information recording medium 10. The information processing apparatus (playback apparatus) that executes content playback executes the process of acquiring the conversion data 21 registered in the conversion table 15 recorded in the information recording medium 10 and replacing the data in the modified data area, thereby playing back the content. 20 is generated and played back.

That is,
The deformation data (broken data) 13 is broken content configuration data generated by adding deformation to normal content configuration data,
The conversion data 21 is correct content configuration data at a position corresponding to the deformation data (broken data) 13.

  The conversion data 21 registered in the conversion table 15 is acquired by the playback apparatus when the content is played back, and a data conversion process for replacing the data in the modified data area 13 is executed. This data conversion process enables correct content reproduction.

  Further, in the configuration of FIG. 1, the configuration is shown in which the transformed content is converted to normal content and data is reproduced (data replacement), and the content is reproduced. is there. This configuration will be described with reference to FIG.

  FIG. 2 shows a configuration example of the recorded content 11 stored in the information recording medium 10 as in FIG. The recorded content 11 is composed only of normal content data that has not been modified. As described above with reference to FIG. 1, the playback apparatus obtains the conversion data 22 from the conversion table (FUT (Fix-Up Table)) 15 recorded on the information recording medium 10 to obtain a part of the content. A process of replacing the data with the converted data 22 is executed to generate playback content 20 and execute playback.

  The conversion data 22 in this case is data (identifier setting conversion data) in which constituent bit information of identification information (also called ID or Forensic Mark) at a level that does not affect reproduction is embedded in a part of normal content data. is there. Specifically, it is identifier setting conversion data including data that makes it possible to analyze the constituent bits of identification information (for example, player ID) that makes it possible to identify a content playback device or content playback application.

  The identifier setting conversion data 22 is used, for example, when the illegally copied content is leaked, to identify the source of the illegal content by analyzing the identifier setting conversion data in the leaked content.

  Further, as shown in FIG. 3, both the normal content conversion data 21 and the identifier setting conversion data 22 are registered in the conversion table 15, and the recorded content is modified data 13 similar to that described with reference to FIG. It is possible to configure such that normal content conversion data 21 is set in the area of the modified data 13 at the time of reproduction, and the identifier setting conversion data 22 is overwritten on other areas as content including the content. Alternatively, the identifier setting conversion data 22 may be overwritten in the area of the modified data 13.

Thus, the conversion table 15 has a configuration in which only normal content data corresponding to the modified data area 13 is registered, a configuration in which only identifier setting conversion data is registered, or a configuration in which both are mixed. Various configurations can be set. The conversion table contains
(A) conversion data,
(B) position information (packet position) of the conversion processing area corresponding to the recording position of the conversion data;
(C) Setting position of conversion processing area in conversion processing area setting packet (byte position in packet),
Etc. are included.
A specific configuration example of the conversion table will be described later.

Moreover, as a recording configuration for the recording medium of the conversion table in which the conversion data is registered,
(A) a configuration in which the content is set as a separate file and recorded on the information recording medium;
(B) A configuration in which content packets are distributed in specific packets in the configuration data and divided into conversion table blocks and recorded.
Either of these two configurations can be adopted.

  In the case of recording in a specific packet in the content configuration data, for example, the conversion table is stored in the transport stream packet including the content with the settings shown in FIG. FIG. 4A shows the structure of content data. This content structure indicates content data including a decoded transport stream (TS) packet. The transport stream is composed of TS (transport stream) packets having a predetermined number of bytes. The conversion table is divided into some of these TS packets and recorded as a conversion table block. For example, the conversion table block is recorded in the TS packets 25, 26,. As the TS packet for storing the conversion table block, for example, a TS packet including a PMT (program map table) set in a distributed manner in the content is used.

For example, the content is stored in a recording medium in a transport stream format that is compressed content according to MPEG-2, and the configuration data is a TS packet. A packet identifier (PID) is set for each TS packet. In the reproduction process, it is necessary to know configuration information and the like in the transport stream, and various tables in which such information is recorded are recorded in the transport stream. For example,
(A) PAT (program association table): a list of PMTs included in the TS, that is, a TS packet storing a PID column of the PMT,
(B) PMT (Program Map Table): Stores the PID of the AV data storage packet.
These information tables are recorded, and at the time of reproduction, information is acquired from these tables and reproduction processing is executed.

  The conversion table is distributed to a plurality of PMTs using a partial data area of a PMT (program map table) recorded in a distributed manner and recorded as a conversion table block. The conversion table block is partial data obtained by dividing the conversion table, and corresponds to conversion table configuration data recorded in one PMT.

  In the conversion table block recorded in the PMT (program map table), the conversion data (which may be identifier setting conversion data) for performing the replacement process on the decrypted content and the position of the modified data in which the conversion data is to be recorded Information (packet position), recording position of converted data in the modified data area (byte position in the packet), and the like are recorded.

Specifically, for example, the TS packet 25 shown in FIG. 4B is PMT, conversion data corresponding to the two conversion processing areas 27 and 28 based on the PMT, position information of the conversion processing areas 27 and 28, conversion Data recording position information and the like are recorded.
For example, the PMT recorded in the TS packet 25 shown in FIG.
(A) Two conversion data to be replaced with the conversion processing areas 27 and 28;
(B) Position information (packet position) of the conversion processing areas 27 and 28,
(C) Setting position of conversion processing area in each packet of conversion processing areas 27 and 28 (byte position in packet)
Is recorded.
Note that (b) the positional information of the conversion processing areas 27 and 28 includes, for example, the number of packets [SPN (source packet number)] to the PMT and the conversion processing area 27, and the conversion processing area 27 to the conversion processing area 28. Information such as the number of packets is recorded. A specific data recording configuration example of the conversion table block will be described later.

  In the conversion data recorded in each conversion table, for example, as shown in FIG. 4B, conversion processing areas 27 and 28 are set in the vicinity of the TS packet including each conversion table. For example, in the example shown in FIG. 4B, the conversion processing areas 27 and 28 are set in the vicinity of the packet 25 including the conversion table. With this setting, when content is decrypted and played back in real time, the data replacement process using the converted data can be executed as a continuous process after the decryption process, and the TS in which the conversion table is recorded. The conversion data can be acquired by the packet detection and analysis process, and the process of writing (overwriting) the conversion data to the position recorded in the table can be efficiently executed.

  For example, when the modified data area 13 included in the recorded content 11 shown in FIG. 1 is generated, it is necessary to destroy the content by data processing on the original content, and the content can be effectively processed by processing on the data area as small as possible. It is preferable that the reproduction data be greatly affected.

  That is, it is preferable that the modified data area 13 included in the recorded content 11 shown in FIG. 1 is set at a position where a normal content image cannot be recognized by processing on a small data area.

  On the other hand, the identifier setting conversion data 22 shown in FIG. 2 is conversion data in which an identification mark is included in normal content. However, since this is conversion data applied to content reproduction, there is a great change with respect to the original normal content. It is necessary to devise measures that do not reach.

[2. Example of playback processing of playback processing content with data conversion]
Next, an example of reproduction processing in the information processing apparatus for reproduction processing content with data conversion described above will be described. FIG. 5 shows a configuration example of the information processing apparatus 120 that executes content reproduction. The information processing apparatus mounts the information recording medium 100 in which content is stored and writes / reads data to / from the information recording medium 100, and records / reproduces data by accessing the information recording medium 100 via the drive 131. The data processing unit 150 is executed.

  The information recording medium 100 is, for example, an information recording medium such as Blu-ray Disc (registered trademark) or DVD, and stores content. As shown in FIG. 5, the information recording medium 100 includes an encrypted content 101 that has been subjected to encryption processing and partial data replacement processing, and a tree-structured key distribution method that is known as one aspect of the broadcast encryption method. MKB (Media Key Block) 102 as an encryption key block generated based on the content key, title key file 103 composed of data (Encrypted CPS Unit Key) encrypted title key applied to content decryption processing, etc. Use permission information 104 including CCI (Copy Control Information) as copy / playback control information, a conversion table (Fix-up Table) 105 in which conversion data corresponding to replacement data of a predetermined area in the content is registered, a conversion table ( (Fix-up Table) 105 registered data Stored data transformation processing program 106 including the processing instructions for execution. The data example shown in the figure is an example, and the stored data differs slightly depending on the type of disk. Hereinafter, an overview of these various types of information will be described.

(1) Encrypted content 101
Various contents are stored in the information recording medium 100. For example, it consists of an AV (Audio Visual) stream of moving image content such as HD (High Definition) movie content which is high-definition moving image data, a game program of a format defined by a specific standard, an image file, audio data, text data, etc. Content.

(2) MKB
An MKB (Media Key Block) 102 is an encryption key block generated based on a tree-structured key distribution method known as one aspect of the broadcast encryption method. The MKB 102 can acquire the media key [Km], which is a key necessary for content decryption, only by processing (decryption) based on the device key [Kd] stored in the information processing apparatus of the user having a valid license. This is a key information block. This is an application of an information distribution method in accordance with a so-called hierarchical tree structure, which makes it possible to acquire and invalidate a media key [Km] only when the user device (information processing apparatus) has a valid license. In the revoked user device, the media key [Km] cannot be acquired.

  The management center as a license entity cannot be decrypted with a device key stored in a specific user device due to a change in the device key used for encrypting key information stored in the MKB, that is, a media key necessary for content decryption cannot be obtained. An MKB having a configuration can be generated. Accordingly, it is possible to provide an encrypted content that can be decrypted only to a device having a valid license by removing (revoking) an unauthorized device at an arbitrary timing. The content decryption process will be described later.

(3) Title key file A content or a set of a plurality of contents is stored in the information recording medium 100 after being encrypted using an individual encryption key (title key (CPS unit key)) for content usage management. Is done. That is, AV (Audio Visual) stream, image data such as music data, moving image, still image, game program, WEB content, etc. constituting the content are divided into units as management units for content use. It is necessary to generate a different title key and perform decryption processing. Information for generating the title key is title key data. For example, the title key is obtained by decrypting the encrypted title key with a key generated by a media key or the like. In accordance with a predetermined encryption key generation sequence to which the title key data is applied, a title key corresponding to each unit is generated and the content is decrypted.

(4) Use Permission Information The use permission information includes, for example, copy / playback control information (CCI). That is, the copy restriction information for use control corresponding to the encrypted content 101 stored in the information recording medium 100 and the reproduction restriction information. This copy / playback control information (CCI) can be set in various ways, for example, when it is set as individual CPS unit information set as a content management unit, or when it is set corresponding to a plurality of CPS units. is there.

(5) Conversion Table As described above, the encrypted content 101 stored in the information recording medium 100 is subjected to predetermined encryption, and conversion processing using conversion data registered in the conversion table when reproducing the content. For example, a part of the content configuration data, which is content that is required to be (data replacement), is composed of modified data different from the correct data.

  When reproducing the content, it is necessary to overwrite the conversion data acquired from the conversion table in a conversion processing area constituted by modified data and the like. A table in which the conversion data is registered is a conversion table (Fix-up Table) 105. A large number of conversion processing areas are scattered and set in the content, and when reproducing the content, it is necessary to replace (overwrite) the plurality of conversion processing areas with conversion data registered in the conversion table. By applying this conversion data, for example, even when the encryption key is leaked and the content is decrypted illegally, the content cannot be reproduced by the presence of the replacement data only by decrypting the content. Unauthorized use of content can be prevented.

  In addition, in the conversion table 105, as described above with reference to FIGS. 1 to 3, in addition to the conversion data composed of normal normal content, identification information that can identify the content playback device or the content playback application is included. Identifier setting conversion data including data that enables analysis of the configuration bits is included. Specifically, for example, a player ID as identification data of a player (a device that executes a reproduction application) or “conversion data including an identification mark” in which identification information generated based on the player ID is recorded is included. The conversion data including the identification mark is data in which the bit value of the correct content data is slightly changed at a level that does not affect the reproduction of the content.

  FIG. 5 shows an example in which the conversion table 105 is set as an independent data file. However, as described above, the conversion table is not an independent file, but scattered in the configuration packet of the encrypted content 101. It may be configured to be included.

(6) Data Conversion Processing Program The data conversion processing program 106 is a program including processing instructions for executing data conversion processing based on registered data in the conversion table (Fix-up Table) 105, and a playback device that executes content playback Used by. The data conversion processing unit 153 in FIG.

  In the data processing unit 150 of the information processing apparatus, the data conversion processing program 106 read from the information recording medium 100 is executed, and the registered data of the conversion table (Fix-up Table) 105 is applied to the decrypted content. Data conversion processing of the partial configuration data is executed.

  As shown in FIG. 5, the data processing unit 150 of the information processing apparatus 120 includes a device 151 as key information applied to content decryption processing, a memory 151 storing various application programs and other information, and encrypted content. A decoding processing unit 152 that executes the decoding processing, a data conversion processing unit 153 that executes data conversion processing based on the registered data of the conversion table 105, and a decoding processing unit 154 that executes decoding (for example, MPEG decoding) processing.

  In the decryption processing unit 152, various information stored in the memory 151 and read data from the information recording medium 100 are applied to generate a key to be applied to content decryption, and decryption processing of the encrypted content 101 is executed. To do. The data conversion processing unit 153 applies the conversion data registered in the conversion table acquired from the information recording medium 100 according to the data conversion processing program acquired from the information recording medium 100 to replace the content configuration data (overwrite) ). The decoding processing unit 154 executes decoding (for example, MPEG decoding) processing.

  The device key Kd stored in the memory 151 is a key applied to the MKB process described above. The MKB can acquire the media key [Km], which is a key necessary for content decryption, only by processing (decryption) based on the device key [Kd] stored in the information processing apparatus of the user having a valid license. When decrypting the encrypted content, the information processing apparatus 120 executes the MKB process by applying the device key: Kd stored in the memory 151.

(2.1) Content playback processing example 1
Content reproduction processing example 1 will be described with reference to FIG. FIG. 6 shows an information recording medium 310 in which encrypted content is stored from the left, and an information processing apparatus 350 that sets the information recording medium 310 and executes data reproduction processing.

  The information recording medium 310 stores an MKB (Media Key Block) 311, a title key file 312, an encrypted content 313, a conversion table 314, and a data conversion processing program 315. The information processing apparatus 350 holds a device key 351 that is applied to the MKB process.

  In step S101, the information processing apparatus 350 illustrated in FIG. 6 acquires the MKB 311 recorded in the information recording medium 310, executes the process of the MKB 311 to which the device key 351 stored in the memory is applied, and executes the process from the MKB to the medium. Obtain the key (Km).

  As described above, the MKB (Media Key Block) 311 is an encryption key block generated based on a tree-structured key distribution method known as one aspect of the broadcast encryption method, and is stored in a device having a valid license. This is a key information block that makes it possible to obtain a media key (Km) that is a key necessary for decrypting content only by processing (decryption) based on the device key (Kd).

  Next, in step S102, the media key (Km) acquired in the MKB process in step S101 is applied, the title key file read from the information recording medium 310 is decrypted, and the title key (Kt) is acquired. . The title key file stored in the information recording medium 310 is a file including data encrypted by a media key, and a title key (Kt) to be applied to content decryption can be acquired by processing using the media key. For example, an AES encryption algorithm is applied to the decryption process in step S102.

  Next, the information processing device 350 reads the encrypted content 313 stored in the information recording medium 310, stores the read content in the track buffer 352, and the title key (Kt) is stored in step S103 for the buffer stored content. The applied decryption process is executed to obtain decrypted content.

  The decrypted content is stored in the plaintext TS buffer 353. (Plain TS) means a decrypted plaintext transport stream. Here, the decrypted content stored in the plaintext TS buffer 353 is content including a conversion processing area such as the above-described modified data (broken data), and it is necessary to perform predetermined data conversion (data replacement by overwriting).

  This data conversion process is indicated by block 371 in FIG. A block 371 in FIG. 6 corresponds to the processing of the data conversion processing unit 153 of the data processing unit 150 shown in FIG. The outline of this data conversion process will be described with reference to FIG.

  The encrypted content 313 shown in FIG. 6 is encrypted content stored in the information recording medium, and this encrypted content is temporarily stored in the track buffer 352 of the information processing apparatus. This is the track buffer storage data 401 shown in FIG.

  By decryption processing of the information processing apparatus, decryption of the encrypted content as the track buffer storage data 401 is executed, and decryption result data is stored in the plaintext TS buffer 353. This is the decoding result data 402 shown in FIG.

  The decryption result data 402 includes a conversion processing area 403 such as modified data (broken data) that is not normal content configuration data, for example. The data conversion processing unit of the information processing apparatus uses this conversion processing area 403 as correct content configuration data acquired from the conversion table 314 recorded in the information recording medium 310 shown in FIG. 6 or an identification mark (ID or Forensic Mark). (Referred to as "conversion data") such as content configuration data for which the content is set. This replacement process is executed, for example, as a rewrite (overwrite) process of a part of the data already written in the plaintext TS buffer 353.

  The identification mark is data that makes it possible to analyze the constituent bits of the identification information that makes it possible to identify the content playback apparatus or the content playback application as described above. Specifically, for example, configuration data of identification information (player ID) of an information processing apparatus as a player that executes a host application, or an identifier generated based on the player ID. The conversion data including the identification mark is data in which the bit value of the correct content data is slightly changed at a level that does not affect the reproduction of the content.

  A large number of pieces of conversion data 405 including identification marks are set in the content during the reproduction process, and the player ID is determined, for example, by collecting and analyzing the conversion data 405 including the plurality of identification marks. The conversion data 405 including the identification mark is data in which the constituent bits of the normal content data are changed at a level that can be normally reproduced as the content, and the bit (identification mark constituent bits) can be determined by MPEG bit stream analysis.

  In the conversion table stored in the information recording medium, a large number of conversion data 404 shown in FIG. 7 or conversion data 405 including an identification mark is registered, and the writing position information is also registered. By executing the data conversion process based on the conversion table storage information, the data stored in the plaintext TS buffer 353 is replaced with the converted data 406 shown in FIG. 7 (3).

  Returning to FIG. 6, processing in the dotted line block 371, that is, data conversion processing on the information processing apparatus side will be described. The data conversion process is executed by, for example, the secure VM 356 set as a virtual machine in the host. A virtual machine (VM) is a virtual computer that directly interprets and executes an intermediate language, and interprets and executes instruction code information in an intermediate language that does not depend on the platform.

  The secure VM 356 reads the data conversion processing program 315 including the instruction code information from the information recording medium 310 and executes the processing. The secure VM 356 is controlled by the event handler 354 and converts the data obtained from the information recording medium 310 by inputting the ID information of the player (information processing apparatus) executing the playback application as the player information 355. The processing program 315 is executed. The event handler 354 executes process monitoring. Emulator check to determine whether the process executed by the secure VM 356 is correctly performed, monitor the process and status of other applications and the player (information processing apparatus) as the application execution device, process error, illegal process, etc. Is detected, the data conversion process by the secure VM 356 is stopped.

  The secure VM 356 applies the conversion table read from the information recording medium 310 and executes the conversion process of the data stored in the plaintext TS buffer 353. That is, in the data conversion processing in step S104 shown in FIG. 6, the conversion processing area 403 is replaced with the conversion data 404 that is valid content configuration data for the decoding result data 402 shown in FIG. Alternatively, a data overwrite process for replacing the converted data 405 including the identification mark with a part of the content data is executed, and the data stored in the plaintext TS buffer 353 is changed to the converted data 406.

  Thereafter, the converted TS (transport stream) is output to the outside via a network or the like and is played back on an external playback device. Alternatively, in step S105, conversion from the transport stream (TS) to the elementary stream (ES) is performed by processing by the demultiplexer, and after the decoding processing (step S106) is performed, the display / speaker is turned on. Played through.

A data configuration example of the data conversion table recorded on the information recording medium will be described with reference to FIGS. 8 to 10.
FIG. 8 shows the entire data structure of the conversion table.
FIG. 9 shows a data configuration of one conversion table block (FUT block) among a plurality of conversion table blocks (FUT blocks) included in the conversion table.
FIG. 10 shows the data structure of the conversion data entry in the conversion table block (FUT).

As shown in FIG. 8, the conversion table includes the following data.
Number of FUT blocks: Number of conversion table blocks
Length of FUT block: Conversion table block byte length
SP_No: Secret parameter (SP) number (corresponding to SP generated by VM)
First SPN for FUT block: The packet position to which the translation table block is assigned
FUT block (): Conversion table block (each block is processed (obfuscated) with different parameters)

  The conversion table includes a plurality of conversion table blocks (FUT), and these conversion table blocks (FUT) are exclusive ORed (XOR) with different secret parameters (SP1, SP2, SP3,...). Arithmetic processing is performed and stored.

FIG. 9 shows one data configuration example of a plurality of conversion table blocks (FUT blocks) included in the conversion table shown in FIG. As shown in FIG. 9, the conversion table block (FUT block) includes the following data.
Number of FixUpEntry in this block: Number of conversion data (including conversion data with identification mark)
Base SPN for FixUpEntry: Base packet position (packet No.) serving as an index of conversion data recording position
FixUpEntry (): Conversion data entry (processed with the secret parameter (obfuscated))

FIG. 10 shows a data configuration example of the conversion data entry (FixUpEntry) included in the conversion table block shown in FIG. As shown in FIG. 10, the conversion data entry (FixUpEntry) includes the following data.
type_indicator: Type identifier [00: No conversion, 01b: Processing by conversion data, 10b, 11b: Processing by conversion data with identification mark]
FM_ID_bit_position: identification bit position of player ID corresponding to conversion data with identification mark
relative_SPN: Conversion data application packet position (number of packets from the programmable map table (PMT) storage packet)
byte_position: Conversion data recording position in the packet
overwrite_value: Conversion data (including conversion data with identification mark)
relative_SPN_2: Second conversion data application packet position (number of packets from the first conversion data application packet)
byte_position_2: Conversion data recording position in the packet (corresponding to the second conversion data)
overwrite_value_2: Second conversion data (including conversion data with identification mark)
It consists of these data.

  The conversion table is set as a conversion table in which conversion data that is a part of the content data to be replaced and setting position information for the content of the conversion data is recorded, and content conversion data replacement processing by applying this conversion table Data conversion is performed by executing a data conversion processing program including an execution instruction.

In one content, a large number of conversion processing areas are interspersed and the conversion data recorded in the conversion table is overwritten in this conversion processing area. The conversion table includes (a) conversion data consisting of normal content, (b) identifier setting conversion data, “conversion overwriting data” as at least one of these substance data,
These are set as a table in which the designation information of the writing position of these data is recorded.

  Note that various settings can be made as to how often the replacement area is set by the conversion data and the size of the conversion data, but the conversion table size varies depending on each setting. For example, in a configuration in which two conversion data or conversion data with an identification mark is set per 1 GOP (Group Of Pictures) constituting MPEG content, if the conversion data (including conversion data with an identification mark) is 8 bytes, about In the case of a table of about 400 KB and 16 bytes, the table size is about 600 KB.

  Further, in a configuration in which five conversion data or conversion data with an identification mark is set per 1 GOP (Group Of Pictures) constituting the MPEG content, when the conversion data (including conversion data with an identification mark) is 8 bytes, When the table is about 1 MB and 16 bytes, the table size is about 1.5 MB. In addition, about the desirable setting example of a deformation | transformation data area, [3. This will be described in detail in the section “Example of setting of modified data area in consideration of player processing”.

The secure VM of the information processing device 350 uses the conversion table 314 recorded on the information recording medium 310 to
(A) Conversion data consisting of normal contents (b) Identifier setting conversion data Processing for writing at least one of these into a conversion processing area which is a designated position of the conversion table is executed. The data writing is executed as an overwriting process of the conversion data for the data stored in the plaintext TS buffer 253. As a result of this process, the data stored in the plaintext TS buffer 253 is the data shown in FIG. Will be replaced.

  External output of content from the information processing apparatus or content reproduction is executed as processing based on the converted data shown in FIG.

  The conversion data is correct content configuration data or identifier setting conversion data, and is data applied to playback of correct content. Therefore, correct content playback can be performed by decoding playback based on these data. In addition, for example, when this content is illegally copied and a large amount of copy data is leaked to the outside, it is possible to obtain a player ID by analyzing the identifier setting conversion data. Can be specified.

(2.2) Content reproduction processing example 2
Next, content reproduction processing example 2 will be described with reference to FIG. FIG. 11 shows the information recording medium 310, the drive 330, and the host 350 in which encrypted content is stored from the left. The MKB (Media Key Block), the title key file, and the processing to which these are applied are the same as those in the processing example 1 described above with reference to FIG. In this processing example, as shown in FIG. 11, the information recording medium 310 stores encrypted content 318 including a conversion table and a data conversion processing program 315.

  In this processing example, the conversion table is recorded by being distributed in specific packets in the configuration data of the encrypted content. That is, the conversion table is distributed and stored in the transport stream packet including the content as the conversion table block with the setting as shown in FIG. 4 described above. As the TS packet for storing the conversion table block, for example, a TS packet including a PMT (program map table) set in a distributed manner in the content is used.

  As described above, in a configuration in which a conversion table is stored in a transport stream packet including content, the conversion table is, for example, in units of conversion table blocks (FUT (Fix-Up Table) blocks) as partial configuration data of the conversion table. Obfuscation processing is performed by operations such as AES encryption and exclusive OR operation. In accordance with the data conversion processing program 315, the secure VM 356 executes a decryption process or a predetermined calculation process in units of each conversion table block (FUT block), and acquires a block unit conversion table as plain text data. These processes are executed intermittently before and during the content reproduction or output process. The data structure of the divided conversion table will be described with reference to FIG.

The conversion table shown in FIG. 12 has a data structure of a divided conversion table, and has a data entity and recording position information only for conversion data (including conversion data with an identification mark) for a specific content partial area. The conversion table data shown in FIG. 12 includes the following data.
SP_No: Secret parameter (SP) identifier (ID) [applied to XOR operation]
type_indicator: Type identifier [00: No conversion, 01b: Processing by conversion data, 10b, 11b: Processing by conversion data with identification mark]
FM_ID_bit_position: identification bit position of player ID corresponding to conversion data with identification mark
relative_SPN: Conversion data application packet position (number of packets from the programmable map table (PMT) storage packet)
byte_position: Conversion data recording position in the packet
overwrite_value: Conversion data (including conversion data with identification mark)
relative_SPN_2: Second conversion data application packet position (number of packets from the first conversion data application packet)
byte_position_2: Conversion data recording position in the packet (corresponding to the second conversion data)
overwrite_value_2: Second conversion data (including conversion data with identification mark)
It consists of these data.

  As described above, the conversion table shown in FIG. 12 is distributed and recorded in TS packets including specific packets, for example, PMT (program map table) in the configuration data of the encrypted content. In the divided conversion table data, as shown in FIG. 12, conversion data (or conversion data with an identification mark) for performing a replacement process on the decrypted content and a recording position of the conversion data are recorded.

  The conversion table shown in FIG. 12 is set as a conversion table in which conversion data to be replaced in part of content data and setting position information for the content of the conversion data are recorded. Data conversion is performed by executing a data conversion processing program including a data replacement processing execution instruction.

The information [type_indicator] included in the conversion table is the registration information of the conversion table,
(A) registration information regarding conversion data for converting broken data into legitimate content data, or
(B) registration information regarding conversion data with an identification mark for embedding identification information of a playback device or content playback application,
This is a type identifier for identifying which of the registration information items (a) and (b).

  When the registration information area of the conversion table is a registration information area related to conversion data with an identification mark for embedding the identification information of the playback device or content playback application, the table registration information includes the content playback device or content playback application. Conversion data to be selectively applied based on the identification information, that is, conversion data with an identification mark is registered.

  The registration information [FM_ID_bit_position] of the conversion table is position information of bits to be referred for determining the processing mode in the identification information of the playback device or playback application consisting of a plurality of bits.

  For example, when the bit value of the bit to be referred to for determining the processing mode is 1 in the identification information of the playback device or playback application consisting of a plurality of bits, the content configuration data is converted by the conversion data with the identification mark registered in the conversion table. Is replaced, and when the bit value of the bit to be referred to is 0, the processing mode is determined such that the replacement is not executed, and the data conversion is executed.

  It is also possible to set so that conversion is executed when the reference bit is 0 and conversion is not executed when the reference bit is 1. Alternatively, the conversion data when the reference bit is 0 and the conversion data when the reference bit are 1 are set as different conversion data, and the conversion data is appropriately selected and set according to the bit value of the reference bit. Good.

  Note that the conversion table is set as an obfuscated conversion table by arithmetic processing or encryption processing in which different parameters are applied to each partial conversion table data in which conversion data corresponding to only partial configuration data of content is recorded. The

  A processing sequence of the content reproduction processing example 2 shown in FIG. 11 will be described. The secure VM 356 reads the data conversion processing program 315 including the instruction code information from the information recording medium 310 and intermittently controls the event handler 354 and inputs the player information 355 before and during the content reproduction or output processing. Based on this, parameters (P1, P2, P3...) Necessary for converting the conversion table block recorded together with the content on the information recording medium 310 into a plaintext conversion table are generated and output. This process is performed intermittently.

  Parameters P1, P2, P3,... Are operations or encryption processes applied to divided conversion table blocks corresponding to a predetermined content data unit, for example, conversion table blocks 1, 2, 3,. It is a parameter. Each of the conversion table blocks 1, 2, 3... Is subjected to computation or encryption processing using different parameters P1, P2, P3.

  For example, specifically, an exclusive OR (XOR) operation parameter applied to the conversion table blocks 1, 2, 3,... In accordance with the data conversion processing program 315, the secure VM 356 executes processing for intermittently generating and outputting parameters (P1, P2, P3...) Necessary for making the conversion table block 314 into a plaintext conversion table.

In step S301, decryption of the encrypted content 318 including the conversion table block is executed, and each conversion table block is separated by the demultiplexer process in step S302, and the data conversion process in step S303 is controlled by the real-time event handler 361. Is executed. Under the control of the real-time event handler 361, the parameters (P1, P2, P3) intermittently output from the secure VM 356 are applied, the conversion table block is decrypted or calculated, and the plaintext conversion table block is acquired and acquired. Conversion data registered in the partial conversion table block, that is,
(A) Conversion data consisting of normal content (b) Identifier setting conversion data Data conversion processing for writing any of these into the conversion processing area at the designated position recorded in the conversion table is performed in parallel with content reproduction processing or external output processing As real-time processing.

For example, when the parameters P1, P2, P3,... Are exclusive OR (XOR) operation parameters with conversion data corresponding to a predetermined content part data unit, the table restoration processing in step S303 is as follows:
[Conversion table block 1] (XOR) [P1],
[Conversion Table Block 2] (XOR) [P2],
[Conversion table block 3] (XOR) [P3],
::
These exclusive OR operation processes are executed to obtain each plaintext conversion table block data. In the above formula, [A] (XOR) [B] means an exclusive OR operation of A and B.

  As described above, the conversion table block included in the content 318 recorded on the information recording medium is divided as a block in which conversion data and conversion data position (conversion processing area) information corresponding to each content portion is recorded. Are stored by performing an exclusive OR operation with the specific parameters P1, P2, P3. This parameter is sequentially acquired and output by the secure VM 356.

  The processing after the data conversion processing in step S303 is the same as the processing described above with reference to FIG. 6, and is performed as real-time processing executed in parallel with content reproduction and content external output processing. That is, the demultiplexer process in step S304, the decode process in step S305, and these processes are executed as real-time processes in parallel with content reproduction or external output.

  In this processing example, the configuration data of the conversion table corresponding to the entire content is divided, different parameters are associated with each conversion table, and the secure VM 356 intermittently outputs these parameters. Therefore, for example, even if a part of parameters is leaked, it is impossible to restore the entire content, and more robust content usage management is realized. For example, when unauthorized processing is detected during content playback, the generation of conversion data is stopped by stopping the processing of the secure VM 356 based on the unauthorized processing detection information of the event handler 354, and unauthorized content playback or external output is performed. Can be terminated on the way.

[3. Example of conversion processing area setting considering player processing]
Next, a description will be given of an example of setting a modified data area in consideration of the processing capability of the playback device (player) in the generation of playback processing content with data conversion described above. The playback device that plays back the above-described playback processing content with data conversion must perform data replacement processing with converted data in content playback, and this processing increases the processing load on the playback device (player). . Therefore, if the conversion processing area composed of modified data or the like is increased, the frequency of data conversion processing increases, and playback with a low processing capacity (player) cannot be played back due to the data conversion processing. May occur. In the following, a configuration for preventing the occurrence of such a situation, that is, an example of setting a conversion processing area in consideration of player processing will be described.

As described above, the conversion table has a configuration that is set as a file separate from the content, and a setting that is recorded as a conversion table block distributed in a PMT (program map table) in the content. Less than,
(3-1) Conversion processing area setting example in a configuration in which a conversion table is distributedly recorded in content (3-2) Conversion processing region setting example in a configuration using a conversion table independent of content Each of these types will be described sequentially To do.

(3-1) Conversion processing area setting example in a configuration in which a conversion table is distributedly recorded in content First, a conversion processing area setting example in a configuration in which a conversion table is distributedly recorded in content will be described. As described above, the content recorded on the information recording medium is recorded in the transport stream format as compressed content according to MPEG-2, and the configuration data is a TS packet. A packet identifier (PID) is set for each TS packet. In the reproduction process, it is necessary to know configuration information and the like in the transport stream, and various tables in which such information is recorded are recorded in the transport stream. For example,
(A) PAT (program association table): a list of PMTs included in the TS, that is, a TS packet storing a PID column of the PMT,
(B) PMT (Program Map Table): Stores the PID of the AV data storage packet.
These information tables are recorded, and at the time of reproduction, information is acquired from these tables and reproduction processing is executed.

The conversion table block constituting the conversion table is recorded using a part of the PMT area in the TS packet storing the PMT. The conversion table block contains
(A) Two conversion data to be replaced with, for example, two conversion processing areas set in the vicinity of the PMT,
(B) position information (packet position) of the conversion processing area,
(C) The position of the conversion processing area in each packet of the conversion processing area (byte position in the packet)
Will be recorded.

  The standard for the data recording format of the transport stream (TS) in the MPEG format is called [MPEG-TS standard]. In the above-described PAT (program association table) and PMT (program map table), the maximum number that can be set in the transport stream (TS) is set in the MPEG-TS standard. Specifically, the data amount of TS packets storing PAT and PMT that can be processed in the TS decoder model of the MPEG-TS standard is defined as 96 kbps in a TS with a multiplexing rate of 48 Mbps.

That is, the MPEG-TS standard stipulates that the amount of data of TS packets storing PAT and PMT between transport stream (TS) AV stream data for one second is less than 96 kilobits.
The TS packet is 188-byte data, and the PAT is data that needs to be multiplexed once every 100 ms.

Based on these conditions, the number of PMTs [X] that can be set in a section of 1 second of the transport stream (TS) in accordance with the MPEG-TS standard needs to satisfy the following expression.
(188 × 8 × 10) + (188 × 8 × X) <96000 (Formula 1)
It is.
In the above formula (Formula 1),
(188 × 8 × 10): Number of bits of TS packet for 10 PATs (188 × 8),
(188 × 8 × X): Number of bits of PMT [X] TS packets (188 × 8),
96000: Data amount of TS packet storing PAT and PMT that can be set for 1 second of transport stream (TS) defined by MPEG-TS standard,
It is.
X satisfying the above formula (formula 1) is
X <53
It becomes. That is, up to about 50 PMTs can be set in a section of 1 second of the transport stream (TS).

  In general, about 1 PMT is multiplexed in 100 ms, and about 10 are set per second. In order to perform the data conversion by the conversion table block proposed in the present application at a high frequency, it is possible to set the PMT setting TS packet in which the conversion table block is recorded at a maximum number of 50 / sec. In this case, one PMT is set every 20 msec.

  FIG. 13 shows a PMT setting example in the transport stream (TS). FIG. 13A shows a typical PMT setting example, that is, an example of a stream (Clip AV Stream) in which 10 PMT settings are made per second. FIG. 13B shows an example of a stream (Clip AV Stream) in which 50 PMT settings are made per second as an example of the PMT setting that satisfies the above-described (Equation 1).

  As described above, the maximum allowable number of PMTs in the transport stream (TS) can be determined to be about 50 per second based on the MPEG-TS standard. There are restrictions on the setting of the processing area, and when setting the conversion processing area, it is required that the setting satisfy these restrictions. This restriction will be described with reference to FIG.

  FIG. 14A shows the content before the conversion processing area setting in which only the PMT is set and the conversion processing area setting by the content deformation processing is not executed, and FIG. 14B shows the conversion by the content deformation processing or the like. The example of the content after processing area setting is shown.

  In this example, the conversion table block, which is the configuration data of the conversion table, is distributed and recorded in the PMT in the content, and TS packets (for example, two) after the PMT in which the conversion table block is recorded are converted, for example, by content transformation Set as processing area. This is the data configuration described above with reference to FIG.

In consideration of the processing of the device that executes the reproduction processing, as shown in FIG. 14 (b2), the interval between the PMT setting TS packet 501 storing the conversion table block and the packet 502 including the conversion processing area, and the conversion processing The interval between the packets 502 and 503 including the area is required to be an interval of 10 TS packets or more. Therefore, the PMT setting conditions for recording the conversion table are:
(Condition 1) The PMT interval for recording the conversion table block is 22 TS packets or more,
It is necessary to satisfy the above conditions.

Note that [relative_SPN] and [relative_SPN_2] illustrated in FIG. 14B2 are as described above with reference to FIG.
relative_SPN: Conversion data application packet position (number of packets from the programmable map table (PMT) storage packet)
relative_SPN_2: Second conversion data application packet position (number of packets from the first conversion data application packet)
It is.

  In random playback of a transport stream (TS), an EP map in which playback start point information capable of random playback is recorded is used. In the EP map, packet position information of a reproduction start point capable of random reproduction is recorded. When performing random playback, the playback device acquires the playback start packet number of the transport stream based on the playback start point designation information acquired from the EP map, and executes reading from the packet number. For example, as shown in FIG. 14A, a plurality of random playback start positions (SPN_EP_Start) are set in the transport stream (TS), and these pieces of information are registered in the EP map.

When random playback is executed, only data after the random playable position (SPN_EP_Start) is read, and data before the random playable position (SPN_EP_Start) is not read. Therefore, a PMT storage TS packet in which a certain conversion table block is recorded and a conversion processing area setting packet including a conversion processing area to which the conversion data recorded in the conversion table is applied are at a random playable position (SPN_EP_Start). If it is divided, conversion data corresponding to the conversion processing area cannot be acquired from the conversion table, and data replacement cannot be performed. To prevent this situation,
(Condition 2) The PMT storage TS packet storing the conversion table block and the conversion processing area setting packet to which the conversion data recorded in the PMT are applied are set not to be divided at the random playable position (SPN_EP_Start).
Setting that satisfies the above condition 2 is required.

Further, the conversion processing area to which the conversion data recorded in the conversion table block recorded in the PMT storage TS packet storing one conversion table block is present is the location of the PMT storage TS packet storing the next conversion table block It is necessary to set before. That is,
(Condition 3) The conversion processing area to which the conversion data recorded in the conversion table block recording PMT is applied is located before the packet position of the next conversion table block recording PMT.
It is necessary to satisfy this condition.

As described above, in the configuration in which the conversion table is distributedly recorded in the content, the setting conditions of the conversion processing area and the setting conditions of the PMT storing the conversion table block are as follows.
(Prerequisite) The number of PMT setting TS packets in which conversion table blocks are recorded is 50 / sec or less.
(Condition 1) The interval between PMT recording conversion table blocks is 22 TS packets or more.
(Condition 2) The PMT storage TS packet storing the conversion table block and the conversion processing area to be replaced with the conversion data are set not to be divided at the random playable position (SPN_EP_Start).
(Condition 3) The conversion processing area to which the conversion data recorded in the conversion table block recording PMT is applied is located before the packet position of the next conversion table block recording PMT.
The setting satisfies these conditions.

  In accordance with such conditions, conversion processing area setting processing such as content transformation processing and recording processing for the PMT of the conversion table block are executed, and the conversion processing area setting content shown in FIG. 14B is generated. A specific content generation process and a manufacturing process sequence of an information recording medium on which content is recorded will be described later.

(3-2) Conversion Processing Area Setting Example in Configuration Using Conversion Table Independent of Content Next, a conversion processing area setting example in a configuration using a conversion table independent of content will be described with reference to FIG. To do. In the configuration using the conversion table independent of the content, the conversion processing area can be set more freely as compared with the configuration in which the conversion table is distributed and recorded in the content. For example, it is possible to set so that a plurality of consecutive TS packets are all converted processing area setting packets.

  It is also possible to set a plurality of conversion processing areas in one TS packet. For example, when one unit of modified data is 5-byte data, it is possible to set five modified data (total 5 × 5 = 25 bytes) in one TS packet.

  Note that an information processing device (playback device) that executes content playback processing needs to execute decryption processing of encrypted content, but this encrypted unit data is 6 KB (kilobytes) and is an aligned unit ( Called Aligned Unit). An ECC (error correction code) setting unit is 64 KB. Therefore, an apparatus that performs reproduction processing performs reproduction by executing 6 KB decoding processing and 64 KB ECC based error correction processing.

As processing at the time of playback of the playback processing device, these processing, that is,
(1) Decoding processing in units of 6 KB aligned units (Aligned Unit),
(2) Error correction processing based on ECC in 64 KB units,
These processes are indispensable, and data conversion processing based on the conversion table is further performed.

  Regarding the processing capability of the playback processing apparatus, processing in 6 KB as an encryption processing unit, 64 KB as an ECC setting unit, and 192 KB (32 Aligned Unit) which is the least common multiple of these will be considered. The playback device executes 32 times of decoding processing and 3 times of error correction based on ECC for 192 KB data. Furthermore, as a result of verifying executable data conversion processing in these 192 KB playback processes, it was verified that about 30 data conversions can be performed. Note that the maximum number of data conversion bits by one unit of conversion data is [5 bytes]. This verification is based on the processing capability of the average playback device, and changes according to the processing capability of the playback processing device.

  As described above, in the conversion processing area setting example in the configuration using the conversion table independent of the content, the maximum number of conversion processing areas set in units of 32 aligned units (192 KB), for example, is determined according to the processing capability of the playback device. Then, the conversion process area is set by the content transformation process and the conversion table is created. Hereinafter, a setting example in the case of setting 30 conversion processing areas in 32 aligned units (192 KB) will be described with reference to FIG.

The recording data when the conversion table is set to an independent file different from the content includes, for example, the following data in addition to the conversion data.
(A) Reference packet (base SPN) position information for calculating the position of the packet recording the conversion processing area;
(B) Offset distance (number of separated packets) from the reference packet (base SPN) to the conversion processing area setting packet,
(C) Conversion processing area setting position in the conversion processing area setting packet (byte position in the packet)
These data are recorded.

  As a setting mode of the reference packet (base SPN) when the conversion table is set to an independent file different from the content and the conversion processing area setting packet, it is particularly necessary to concentrate the deformation and intensively destroy a specific place. Alternatively, there are three types of types A to C as shown in FIG. FIG. 15A shows only two aligned units constituting 32 aligned units for setting 30 conversion processing areas (data transformation areas and the like).

  In type A, 15 reference packets (base SPN) are set in aligned unit 1, and conversion processing areas such as 5 data transformation areas are set in one TS packet in the next aligned unit 2. This is an example in which five conversion processing area setting packets are set. For example, one conversion processing area has a maximum of 5 bytes, and one TS packet has a conversion processing area of a maximum of 5 × 5 = 25 bytes.

  In type B, 15 reference packets (base SPN) are set in aligned unit 1, and 30 conversion processes in which one conversion processing area is set in one TS packet in the next aligned unit 2. This is an example in which an area setting packet is set. Note that a conversion processing area for one modified data or the like has a maximum of 5 bytes, and a conversion processing area of a maximum of 5 bytes is set for one TS packet.

  In type C, 15 reference packets (base SPN) are set in aligned unit 1, and conversion processing areas such as 5 data transformation areas are set in one TS packet in the next aligned unit 2. This is an example in which three conversion processing area setting packets and 15 conversion processing area setting packets in which one conversion processing area is set in one TS packet are set. Note that a conversion processing area for one piece of modified data has a maximum of 5 bytes, and a conversion processing area of a maximum of 5 × 5 = 25 bytes is set for one TS packet.

The figure shows an example in which the reference packets (base SPN) and the modified data storage packets are concentrated and set in two aligned units for both types A to C, but these are scattered in 32 aligned units. It may be set. That is, it is only necessary to satisfy the condition that 30 pieces of deformation data are set in 32 aligned units. Types A to C are respectively
Type A: An example using only a conversion processing area setting packet in which five conversion processing areas are set in one TS packet,
Type B: an example using only a conversion processing area setting packet in which one conversion processing area is set in one TS packet,
Type C: an example in which a conversion processing region setting packet in which five conversion processing regions are set in one TS packet and a conversion processing region setting packet in which one conversion processing region is set in one TS packet are mixed.
Each of these examples is shown. Note that when setting the identifier (Forensic Mark), even if the conversion process is not performed, the content viewed by the user is not actually affected, so only devices with high playback processing capability are centrally placed. There is no problem even if the converted conversion processing area is made deformable, and an apparatus having a low reproduction processing capacity is arranged in a concentrated manner so that the conversion processing cannot be performed.

  Furthermore, types A to C can be mixed in one AV stream. FIG. 15B shows an example of content created by mixing the setting types A to C shown in FIG.

  FIG. 16 shows a packet configuration example of a conversion processing region setting packet in which five conversion processing regions are set in one TS packet and a conversion processing region setting packet in which one conversion processing region is set in one TS packet. Show.

  FIG. 16A is an example in which modified data is set as the conversion processing area, and shows a modified data storage packet configuration in which one data modified area of 5 bytes is set. The TS packet includes a source packet header, a TS header + adaptation field, and a payload. The actual data of the AV content is stored in the payload area, and in the modified data area, 5 bytes in the payload are selected and a data change process of 5 bytes is performed. FIG. 16B shows a modified data storage packet configuration in which 5 data modified areas of 5 bytes are set. As the modified data area, five 5-byte areas in the payload are selected, and a data change process of a total of 25 bytes is performed.

  With reference to FIGS. 17 to 19, an example of the data structure of the conversion table corresponding to each of type A to type C shown in FIG. 15 will be described.

FIG. 17 is a diagram illustrating the configuration of a conversion table corresponding to type A.
FIG. 17A shows the configuration of the conversion table corresponding to type A.
FIG. 17 (2) illustrates the correspondence between the conversion table entry and the content storage data.
Is shown.
Note that the conversion table shown in FIG. 17A shows only a part of the information recorded in the conversion table. Although the conversion data entity (OverWrite value) is also recorded in the conversion table, it is not shown in the figure.

  Fifteen entries [1] to [15] are recorded in the conversion table. Each entry is set corresponding to one reference packet (base SPN), two conversion data are recorded in one entry, and conversion processing information corresponding to these two conversion data is recorded. . For example, entry [1] is an entry corresponding to the first reference packet (base SPN) 601 in the first aligned unit shown in FIG.

The following data is recorded in each entry of the conversion table.
Base SPN (BaseSPN): Packet number of reference packet (base SPN) R_SPN_1: Position information of conversion processing area setting packet in which first conversion processing area (5 bytes) is set (number of packets from reference packet (base SPN))
R_SPN_2: Position information of the conversion processing area setting packet in which the second conversion processing area (5 bytes) is set (number of packets from the first modified data storage packet)
Byte_1: Byte position of the first conversion processing area (5 bytes) in the conversion processing area setting packet Byte_2: Byte position of the second conversion processing area (5 bytes) in the conversion processing area setting packet These pieces of information are stored.

  In type A, as shown in FIG. 17B, five conversion processing areas such as five modified data are set in one conversion processing area setting packet. In the first TS packet of the second aligned unit shown in FIG. 17 (2), five 5-byte conversion data are recorded. In the enlarged view shown in the lower part, entries [1] to [3] of the conversion table are displayed. Shows the correspondence.

The configuration data of entry [1] of the conversion table shown in FIG.
Base SPN (BaseSPN): The packet number (0) of the reference packet (base SPN) is information indicating the position of the packet 601 shown in FIG.
R_SPN_1: (32) is set as the position information (number of packets from the reference packet (base SPN)) of the conversion processing area setting packet stored in the first conversion processing area (5 bytes). This information is data indicating that the 32nd packet position from the packet 601, that is, a packet in which a conversion processing area to be replaced with the first conversion data is set in the first packet of the second aligned unit.

  R_SPN_2: (0) is set as the position information (number of packets from the first conversion processing area setting packet) of the conversion processing area setting packet stored in the second conversion processing area (5 bytes), and the second conversion processing The area is information indicating that the relative position to the conversion processing area setting packet in which the first conversion processing area (5 bytes) is set = 0, that is, the same packet is set.

  Byte_1: (8) is set as the byte position of the first conversion processing area (5 bytes) in the conversion processing area setting packet. This is because the first conversion data corresponding to the entry [1] in the conversion table is recorded from the 8th byte in the conversion processing area setting packet, as shown in the lower packet configuration diagram of FIG. This is information indicating that the data is replaced (overwritten) with respect to the conversion processing area data.

  Byte_2: (13) is set as the byte position of the second conversion processing area (5 bytes) in the conversion processing area setting packet. This is because the second conversion data corresponding to the entry [1] in the conversion table is recorded from the 13th byte in the conversion processing area setting packet, as shown in the lower packet configuration diagram of FIG. This is information indicating that the data is replaced (overwritten) with respect to the second conversion processing area data.

  In this way, the conversion table records conversion data and information such as the packet position in the conversion processing area and the byte position in the packet as information necessary for executing data conversion in the reproduction process. The conversion process is executed while acquiring these pieces of information from the conversion table.

FIG. 18 is a diagram illustrating the configuration of a conversion table corresponding to type B.
FIG. 18 (1) shows the configuration of the conversion table corresponding to type B.
FIG. 18 (2) illustrates the correspondence between the conversion table entry and the content storage data.
Is shown.
Note that the conversion table shown in FIG. 18A shows only a part of the information recorded in the conversion table. Although the conversion data entity (Overwrite value) is also recorded in the conversion table, it is not shown in the figure.

  In type B, as shown in FIG. 18 (2), one conversion processing area is set in one conversion processing area setting packet. In the first TS packet of the second aligned unit shown in FIG. 18 (2), for example, one piece of 5-byte modified data is set. The lower enlarged view shows the correspondence with the entry [1] of the conversion table.

The configuration data of entry [1] of the conversion table shown in FIG.
Base SPN (BaseSPN): The packet number (0) of the reference packet (base SPN) is information indicating the position of the packet 611 shown in FIG.
R_SPN_1: (32) is set as the position information (number of packets from the reference packet (base SPN)) of the conversion processing area setting packet in which the first conversion processing area (5 bytes) is set. This information is data indicating that the 32nd packet position from the packet 611, that is, the first packet of the second aligned unit is the first conversion processing area setting packet.

  R_SPN_2: (1) is set as the position information (number of packets from the first conversion processing area setting packet) of the conversion processing area setting packet in which the second conversion processing area (5 bytes) is set, and the second conversion processing The area is information indicating that the relative position of the first conversion processing area (5 bytes) with respect to the set packet = 1, that is, the subsequent packet is set.

  Byte_1: (8) is set as the byte position of the first conversion processing area (5 bytes) in the conversion processing area setting packet. This is because the first conversion data corresponding to the entry [1] in the conversion table is recorded from the 8th byte in the conversion processing area setting packet, as shown in the lower packet configuration diagram of FIG. 18 (2). This is information indicating that the data is replaced (overwritten) with respect to the conversion processing area data.

  Byte_2: (8) is set as the byte position of the second conversion processing area (5 bytes) in the conversion processing area setting packet. This is because the second conversion data corresponding to the entry [1] in the conversion table is replaced with the conversion processing area data recorded from the eighth byte of the subsequent packet of the first conversion processing area setting packet ( This is information indicating that the data is overwrite.

FIG. 19 is a diagram illustrating the configuration of a conversion table corresponding to type C.
FIG. 19 (1) shows the configuration of the conversion table corresponding to type C.
FIG. 19 (2) illustrates the correspondence between the conversion table entry and the content storage data.
Is shown.
Note that the conversion table shown in FIG. 19A shows only a part of the information recorded in the conversion table. Although the conversion data entity (Overwrite value) is also recorded in the conversion table, it is not shown in the figure.

  In type C, as shown in FIG. 19 (2), a packet in which conversion processing areas such as five modified data are set in one conversion processing area setting packet and one conversion processing area is one conversion processing. This is a setting in which the packet set in the area setting packet is mixed. In the first TS packet of the second aligned unit shown in FIG. 19 (2), five or one 5-byte conversion processing area is set. The enlarged view shown in the lower part of FIG. 19 (2) shows the correspondence between the packets in which five 5-byte conversion processing areas are set and the entries [1] to [3] of the conversion table.

The configuration data of entry [1] of the conversion table shown in FIG.
Base SPN (BaseSPN): The packet number (0) of the reference packet (base SPN) is information indicating the position of the packet 621 shown in FIG.
R_SPN_1: (32) is set as the position information (number of packets from the reference packet (base SPN)) of the conversion processing area setting packet in which the first conversion processing area (5 bytes) is set. This information is data indicating that the 32nd packet position from the packet 621, that is, the first packet of the second aligned unit is the first conversion processing area setting packet.

  R_SPN_2: (0) is set as position information (number of packets from the first conversion processing area setting packet) of the conversion processing area setting packet in which the second conversion processing area (5 bytes) is set, and the second conversion processing The area is information indicating that the relative position with respect to the packet in which the first conversion processing area (5 bytes) is set = 0, that is, the same packet is set.

  Byte_1: (8) is set as the byte position of the first conversion processing area (5 bytes) in the conversion processing area setting packet. This is because the first conversion data corresponding to the entry [1] in the conversion table is recorded from the 8th byte in the conversion processing area setting packet, as shown in the lower packet configuration diagram of FIG. 19 (2). This is information indicating that the data is to be replaced (overwritten) with respect to the first conversion processing area data.

  Byte_2: (13) is set as the byte position of the second conversion processing area (5 bytes) in the conversion processing area setting packet. This is data that replaces (overwrites) the second conversion data corresponding to the entry [1] in the conversion table with respect to the second conversion processing area data recorded from the 13th byte of the conversion processing area setting packet. It is information indicating that there is.

[4. Content editing and information recording medium manufacturing process]
Next, refer to the flowchart for the manufacturing process sequence of the information recording medium in which the content in which the conversion processing area composed of the above-described deformation data and the like is set and the conversion table in which the conversion data is registered are generated and the generated data is recorded. I will explain.

  FIG. 20 is a flowchart illustrating an entire sequence from editing (authoring) of data to be recorded on the information recording medium to manufacturing of the information recording medium. This process is executed by inputting predetermined content data such as a movie in the information recording medium manufacturing apparatus. First, in step S501, transport streaming (TS) that constitutes an AV stream is generated by editing the input content with a PMT interval set in accordance with the MPEG-TS standard.

First, as described with reference to FIG. 13, the number of PMTs allowed according to the MPEG-TS standard is calculated, and a TS in which the PMT within the standard is set is generated. It is specified in the MPEG-TS standard that the amount of data of a TS packet storing PAT and PMT is less than 96 kilobits in the AV stream data for one second of the transport stream (TS), and the TS packet is 188 byte data. In addition, since the PAT is data that needs to be multiplexed at least once in 100 ms, the number of PMTs [X] that can be set in the section of the transport stream (TS) 1 second is expressed by the following equation: It is necessary to satisfy
(188 × 8 × 10) + (188 × 8 × X) <96000 (Formula 1)
It is.
In the above formula (Formula 1),
(188 × 8 × 10): Number of bits of TS packet for 10 PATs (188 × 8),
(188 × 8 × X): Number of bits of PMT [X] TS packets (188 × 8),
96000: Data amount of TS packet storing PAT and PMT that can be set for 1 second of transport stream (TS) defined by MPEG-TS standard,
It is.
X satisfying the above formula (formula 1) is
X <53
It becomes. That is, up to about 50 PMTs can be set in a section of 1 second of the transport stream (TS). Accordingly, in step S101, a transport stream (TS) in which about 50 PMTs are set is generated.

  Next, in step S502, the conversion processing area setting packet and the recording contents of the conversion table are determined according to the setting conditions corresponding to the method (option 1) in which the conversion table blocks are scattered in the content.

  The detailed processing in step S502 will be described with reference to the flow shown in FIG. First, in step S521, the AV stream generated in step S501 is analyzed to extract data position candidates that have a high deformation effect and the priority order for the deformation. This process is performed, for example, by a process involving selection of a data position having a high deformation effect, such as a process of selecting an I picture constituting MPEG data.

In step S522, a conversion process area setting packet (such as a modified data storage packet) and a process for determining a PMT packet for recording the conversion table are executed. In this packet determination process, packet selection is performed so as to satisfy the conditions described above with reference to FIGS. That is, the one satisfying the following conditions is selected.
(A) The interval between the conversion table storage PMT and the next conversion table storage PMT is 22 packets or more. (B) The interval from the conversion table storage PMT to the next EP_MAP (SPN_EP_Start) is 22 packets or more. (C1) Conversion processing area setting packet Location requirements,
11th and subsequent packets from the PMT packet => can be registered as a first conversion processing area setting packet (C2) Condition of conversion processing area setting packet,
11th and subsequent packets from the first conversion processing area setting packet => can be registered as the second conversion processing area setting packet (D) selected from those with high deformation priority packet selection considering these (A) to (D) Is done. Note that the condition (D) is considered when the conversion processing area is accompanied by a deformation process, and it is not essential to consider the conversion processing area in which data replacement is performed using an identification mark.

  In step S523, the processing contents for the byte position of the conversion processing area (for example, 5 bytes) of the storage data of the determined conversion processing area setting packet are determined. For example, it is determined whether the deformation is accompanied by destruction or whether the identification mark (Forensic Mark) is inserted.

  The processing in step S502 of FIG. 20, that is, the conversion processing area setting packet corresponding to the setting condition corresponding to the method (option 1) in which the conversion table block is scattered in the content by the processing in steps S521 to S523, and the conversion The process of determining the recorded contents of the table ends.

  Next, the process proceeds to step S503 in FIG. 20, and the conversion processing area setting packet and the recording contents of the conversion table are determined according to the setting condition corresponding to the method (option 2) using the conversion table independent of the content. In the packet determination process in step S503, among the conversion processing area packets determined in the packet determination process corresponding to option 1 in step S502, the modified data area with data destruction is used as a conversion processing area setting packet corresponding to option 2. Also set. However, in a conversion processing area having a small content deformation level to which the identifier (ForensicMark) setting conversion data is applied for reproduction, a conversion processing area not set in option 1 can be set as an original conversion processing area of option 2.

  The detailed process of step S503 will be described with reference to the flow of FIG. First, in step S531, the AV stream generated in step S501 is analyzed to extract data position candidates having a high deformation effect and the priority order for deformation. This process is performed, for example, by a process involving selection of a data position having a high deformation effect, such as a process of selecting an I picture constituting MPEG data.

  In step S532, a conversion processing area is selected. As described with reference to FIG. 15, in the 32 aligned units (32 Aligned Units (Aligned Units # 0 to # 31)) constituting the head AV stream, a maximum of 30 conversion processing area candidates are selected. However, the packet range (for example, the first 15 packets) for placing the reference packet (BaseSPN) is not a conversion processing area setting packet.

Next, in step S533, a conversion processing area is selected. In other words, a maximum of 30 conversion processing areas are selected in the range of 32 aligned units (Aligned Units # 1 to # 32), and thereafter 30/32 AU (Aligned Unit) while shifting the target range by 1 aligned unit. ) Is selected so as not to exceed the upper limit. The following rules are observed when selecting the conversion processing area.
“The maximum conversion processing area that can be placed in one packet is 25 bytes, and there is no overlap between conversion processing areas.”

  Next, in step S534, if the determined number of conversion processing areas does not exceed the upper limit (for example, 1 MB) of the conversion table, the packet number before the conversion processing area setting packet is set in the reference packet (BaseSPN) and data A conversion table (FixUpTable ()) is generated. If the size upper limit is exceeded, the number of conversion processing area selections is reduced and the process is performed again from step S532, and finally the setting is within the size upper limit of the conversion table.

  The processing in step S503 in FIG. 20, that is, the conversion processing region setting packet corresponding to the setting condition corresponding to the method (option 2) using the conversion table independent of the content, and the conversion in steps S531 to S534 are performed. The process of determining the recorded contents of the table ends.

  Next, the process proceeds to step S504, and in accordance with the determined conversion processing area and mode, a transformation process with data destruction is executed, and a conversion table block scattered in the content is applied (option 1). The conversion table block in the PMT is updated, and a content code for generating a conversion table block for a method (option 2) that applies a conversion table independent of the content is created. Next, in step S505, generation of a conversion table for option 2 according to the content code is executed, and recording data generation processing such as encryption of content including the PMT in which the conversion table is set is executed, and in step S506. Then, the generated data is recorded on the information recording medium to manufacture the information recording medium.

  Information in which conversion processing areas are set in the content by the above processing, and conversion tables in which conversion data corresponding to each conversion processing area and information to be applied to conversion processing using the conversion data are recorded are recorded. A recording medium is manufactured. The conversion processing area set in this information recording medium is played back without causing an excessive load in the playback device that executes the playback process.

In the flowchart shown in FIG. 20, one content, that is, a transport stream (TS) is recorded on an information recording medium,
(A) A method (option 1) in which conversion table blocks are scattered in content.
(B) Method for setting the conversion table as an independent file separate from the contents (option 2)
Although the description has been given of the process of recording one content that can be commonly used in each of the above methods on the information recording medium, a configuration for recording dedicated contents corresponding to each of the above methods (options 1 and 2), that is, option 1 It is also possible to record two types of content corresponding to the system and content corresponding to the option 2 system on the information recording medium. This processing sequence will be described with reference to the flowchart shown in FIG.

  First, in step S601, transport streaming (TS) that constitutes an AV stream is generated by editing content with a PMT interval in accordance with the MPEG-TS standard for input content. In this process, two streams corresponding to the same content, a first stream and a second stream are generated. Each is transport streaming (TS) constituting an AV stream in which a PMT interval in accordance with the MPEG-TS standard is set.

  Next, in step S602, one of the two generated streams is selected as a stream to be applied to a method (option 1) in which conversion table blocks are scattered in the content, and the setting condition corresponding to option 1 is set. Accordingly, the conversion processing area setting packet and the recording contents of the conversion table are determined. This process is the same as the process described above with reference to FIG.

  In step S603, the other second stream in the two generated streams is selected as a stream to be applied to a method (option 2) using a conversion table independent of the contents, and setting conditions corresponding to option 2 are set. The conversion processing area setting packet and the recording contents of the conversion table are determined accordingly. This process is similar to the process described above with reference to FIG.

  Next, the process proceeds to step S604, and transformation processing with data destruction is executed for each stream according to the conversion processing area and mode determined in step S602 and step S603, and further, conversions scattered in the content are performed. Content code for updating the conversion table block in the PMT for the method of applying the table block (option 1) and further generating the conversion table block for the method of applying the conversion table independent of the content (option 2) Create Next, in step S605, generation of a conversion table for option 2 according to the content code is executed, and recording data generation processing such as encryption of content including the PMT in which the conversion table is set is executed, and in step S606. Then, the generated data is recorded on the information recording medium to manufacture the information recording medium.

Through the above process,
(A) A method (option 1) in which conversion table blocks are scattered in content.
(B) Method for setting the conversion table as an independent file separate from the contents (option 2)
An information recording medium on which two streams corresponding to these two methods are recorded is manufactured. In any stream, a conversion processing area is set in the content, and a conversion table in which conversion data corresponding to each conversion processing area and information to be applied to conversion processing using the conversion data is recorded. A playback device that plays back the content recorded on the information recording medium selects one of the streams and executes a data conversion process by reading the conversion table based on either of the settings (A) and (B). And execute the playback process. Also in this case, reproduction without causing an excessive load is performed in the reproduction apparatus that performs the reproduction process.

  FIG. 24 is a diagram for explaining processing in an information recording medium manufacturing apparatus that executes generation of content including a conversion processing area, data recording processing for an information recording medium storing the content, and manufacturing processing of the information recording medium. First, a content material 700 such as a movie to be recorded on an information recording medium is input, and the encoding processing unit 701 executes an encoding process such as MPEG encoding. Next, the multiplexing processing unit 702 executes multiplexing processing of video data and audio data, and TS packets such as PMT (program map table). As described above, the PMT is used as a recording area of a conversion table (FUT (Fix-Up Table)) in which conversion data is registered. At this point, since no conversion table has been generated, dummy FUT information is recorded in the PMT.

The conversion processing area & conversion table storage PMT determination unit 703 determines a conversion processing area that is a data position of content for which data replacement is performed using conversion data, and a setting packet for the conversion table storage PMT. That is, the setting position of the conversion processing area constituted by broken data, the setting position of the content data to be replaced by the identifier setting conversion data, and the setting packet of the conversion table storage PMT are determined. The determination of the setting packet for the conversion table storage PMT is as follows:
(A) A method (option 1) in which conversion table blocks are scattered in content.
This is only for streams that apply.

The conversion processing area determination unit 703 also functions as a conversion table storage PMT determination unit.
Details of the processing of the conversion processing area determination unit 703 are as follows.
(A) A method (option 1) for dispersing conversion table blocks in the content is processing according to the flow shown in FIG.
(B) The method (option 2) for setting the conversion table as an independent file separate from the content is processing according to the flow shown in FIG.

Next, the conversion table generation unit 704 generates a conversion table (FUT (Fix-Up Table)) in which conversion data is registered. That is, a conversion table in which conversion data to be replaced with deformation data set as content data is registered.
(A) A method in which conversion table blocks are scattered in the content (option 1)
(B) Method for setting the conversion table as an independent file separate from the contents (option 2)
A table corresponding to is generated. The conversion table contains
(A) Two conversion data to be replaced with the conversion processing area,
(B) position information (packet position) of the conversion processing area,
(C) The position of the conversion processing area in each packet of the conversion processing area (byte position in the packet)
Is recorded.

After generating the conversion table (FUT (Fix-Up Table)) in which the conversion data is registered in the conversion table generation unit 704, the conversion table recording processing unit 705
(A) A method in which conversion table blocks are scattered in the content (option 1)
In this case, the conversion table block data is sequentially recorded in the conversion table storage PMT packet determined by the conversion processing area & conversion table storage PMT determination unit 703.
(B) Method for setting the conversion table as an independent file separate from the contents (option 2)
In the case of, data recording for an independent conversion table is executed.

  Next, the modified data generation unit 706 executes data destruction processing of the content data at the broken data setting position included in the content data position where the data replacement determined by the conversion processing area & conversion table storage PMT determination unit 703 is executed. Thereafter, the encryption processing unit 707 performs encryption processing according to a predetermined sequence, and the data recording unit 708 performs recording processing on the disc to generate a disc 720 on which content is recorded. The processing in the data recording unit 708 includes processing such as master production, stamper production, and disc production by stamping.

  The present invention has been described in detail above 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 invention. 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 invention, the claims should be taken into consideration.

  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 the embodiment of the present invention, the conversion recorded in the conversion table is set in the reproduction process by setting the data conversion processing area including, for example, broken data in the content configuration data. In the configuration where data is replaced and played back, the first conversion processing area setting condition set corresponding to the method of recording the conversion table as a conversion table block scattered in the content, or the conversion table is independent of the content Determination of the conversion processing area so as to satisfy at least one of the second conversion processing area setting conditions set corresponding to the method of recording as data and the first or second conversion processing area setting conditions Execute processing to generate recorded data, and create an information recording medium that uses the content and conversion table as recorded information. It was configured to. The conversion process area setting conditions are set so that the processing load of the playback device that executes the playback process does not become excessive, and during playback, reliable content playback is guaranteed without causing playback errors caused by the data conversion process. Is done.

It is a figure explaining the data conversion process at the time of the content containing a conversion process area | region, and reproduction | regeneration. It is a figure explaining the data conversion process at the time of the content containing a conversion process area | region, and reproduction | regeneration. It is a figure explaining the data conversion process at the time of the content containing a conversion process area | region, and reproduction | regeneration. It is a figure explaining the example of a setting of a conversion table block and a conversion process area. It is a figure explaining the reproduction | regeneration processing of the content containing a conversion process area. It is a figure explaining the reproduction | regeneration processing of the content containing a conversion process area. It is a figure explaining the data conversion process sequence which a reproduction | regeneration processing apparatus performs. It is a figure explaining the example of a data structure of a conversion table. It is a figure explaining the example of a data structure of a conversion table. It is a figure explaining the example of a data structure of a conversion table. It is a figure explaining the data conversion process sequence which a reproduction | regeneration processing apparatus performs. It is a figure explaining the example of a data structure of a conversion table. It is a figure explaining the example of a setting of the PMT packet in the stream which comprises a content. It is a figure explaining the setting conditions in the example which arranges and arranges a conversion table block in contents. It is a figure explaining various types in the example using a conversion table independent of contents. It is a figure explaining the example of a setting structure in the packet of conversion process area | regions, such as deformation | transformation data. It is a figure explaining the structural example of the conversion table in the example using the conversion table independent of content. It is a figure explaining the structural example of the conversion table in the example using the conversion table independent of content. It is a figure explaining the structural example of the conversion table in the example using the conversion table independent of content. It is a figure which shows the flowchart explaining the manufacturing process sequence of the information recording medium accompanying the production | generation of a content and a conversion table. It is a figure which shows the flowchart explaining the process sequence which sets a conversion process area | region and a conversion table storage PMT packet in the structure which arranges the conversion table block in the content so that it is scattered. It is a figure which shows the flowchart explaining the process sequence which sets a conversion process area | region and a conversion table storage PMT packet in the structure which sets the conversion table independent of content. It is a figure which shows the flowchart explaining the manufacturing process sequence of the information recording medium accompanying the production | generation of a content and a conversion table. It is a block diagram explaining the structure of the information recording medium manufacturing apparatus which performs the manufacturing process of the information recording medium accompanied with the production | generation of a content and a conversion table.

Explanation of symbols

10 Information Recording Medium 11 Recorded Content 12 Normal Content 13 Modified Data (Broken Data)
15 Conversion table 20 Playback content 21 Conversion data (normal content)
22 Conversion data (identifier setting conversion data)
25, 26 TS packet 27, 28 packet 100 Information recording medium 101 Encrypted content 102 MKB
103 Title Key File 104 Usage Permission Information 105 Conversion Table 106 Data Conversion Processing Program 120 Information Processing Device 131 Drive 150 Data Processing Unit 151 Memory 152 Decoding Processing Unit 153 Data Conversion Processing Unit 154 Decoding Processing Unit 310 Information Recording Medium 311 MKB
312 Title key file 313 Encrypted content 314 Conversion table 315 Data conversion processing program 318 Encrypted content 330 Information processing device 351 Device key 352 Track buffer 353 Plain text TS buffer 354 Event handler 355 Player information 356 Secure VM
361 Real-time event handler 401 Track buffer storage data 402 Decoding result data 403 Conversion processing area 404 Conversion data 405 Identifier setting conversion data 406 Conversion processed data 611, 611, 621, packet 700 Content material 701 Encoding processing unit 702 Multiplexing processing unit 703 Conversion processing area determination unit 704 Conversion table generation unit 705 Conversion table recording processing unit 706 Modified data generation unit 707 Encryption processing means 708 Data recording unit 720 Information recording medium

Claims (18)

An information processing apparatus that executes information recording processing,
A conversion processing area determination unit for determining a position in the content for setting a conversion processing area for executing data conversion processing in the content reproduction processing;
A conversion table generating unit that generates a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A content including the conversion processing area; and a data recording unit that records the conversion table on an information recording medium;
The conversion processing area determination unit
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
A conversion processing region determination process is executed so as to satisfy at least one of the first or second conversion processing region setting conditions ;
Conversion is performed in units of 32 aligned units in which 32 aligned units (32) are aligned in accordance with at least the second conversion processing area setting condition set corresponding to a method of recording the conversion table as data independent of the content. An information processing apparatus, comprising: a condition for executing conversion processing area determination processing that satisfies a condition including an upper limit of 30 conversion processing areas determined based on a table . The conversion processing area determination unit
As the first conversion processing area setting condition set in correspondence with the method of recording the conversion table as a conversion table block scattered in the content,
(A) The interval between PMT (program map table) packets for storing conversion table blocks is 22 packets or more;
(B) The interval from the PMT (Program Map Table) packet storing the conversion table block to the random playback start position (SPN_EP_Start) set in the next EP map is 22 packets or more,
The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a conversion process area determination process so as to satisfy the condition. The conversion processing area determination unit further includes:
(C1) A packet whose interval from the conversion table block storage PMT (program map table) packet is 11 packets or more is set as a preceding conversion processing area setting packet,
(C1) The configuration is such that a conversion processing region determination process is executed by selecting a packet having an interval of 11 packets or more from the preceding conversion processing region setting packet as a subsequent conversion processing region setting packet. The information processing apparatus described in 1. The conversion processing area determination unit
The conversion process area determination process is executed so as to satisfy the condition that the PMT (program map table) packet storing the conversion table block is set to 50 or less per transport packet stream (TS) storing the content. The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to perform the processing. The conversion processing area determination unit
2. The information according to claim 1, wherein the conversion processing area determination processing is executed so as to satisfy a condition that the number of bytes set in the conversion processing area per packet of the content configuration stream is 25 bytes. Processing equipment. The conversion processing area determination unit
Content to be recorded on the information recording medium
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the transformation processing having a large influence on the reproduction data is subjected to the conversion processing area determination processing so as to satisfy the condition that the conversion processing area is set as an area common to both methods (1) and (2). The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute. The conversion processing area determination unit
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the deformation process having little influence on the reproduction data is configured to be determined as a conversion processing area to be applied only to at least one of the above-described methods (1) and (2). The information processing apparatus according to claim 1. The conversion processing area determination unit
Content to be recorded on the information recording medium
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording individual content corresponding to each of the methods shown in (1) and (2) above,
For the first content, the first conversion processing area setting condition,
For the second content, the second conversion processing area setting condition,
The information processing apparatus according to claim 1, wherein the conversion processing region determination process is executed so as to satisfy the requirements individually. An information recording medium manufacturing method for manufacturing an information recording medium in an information processing apparatus,
A conversion processing region determination unit for determining a position in the content for setting a conversion processing region for executing the data conversion processing in the content reproduction processing;
A conversion table generating unit for generating a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A data recording unit includes a content including the conversion processing area, and a data recording step of recording the conversion table on an information recording medium;
The conversion processing area determination step includes:
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
A conversion processing region determination process is executed so as to satisfy at least one of the first or second conversion processing region setting conditions ;
Conversion is performed in units of 32 aligned units in which 32 aligned units (32) are aligned in accordance with at least the second conversion processing area setting condition set corresponding to a method of recording the conversion table as data independent of the content. An information recording medium manufacturing method comprising the step of executing a process of determining a conversion process area that satisfies the condition, including a condition that the upper limit of the number of conversion process areas determined based on the table is 30 locations . The conversion processing area determination step includes:
As the first conversion processing area setting condition set in correspondence with the method of recording the conversion table as a conversion table block scattered in the content,
(A) The interval between PMT (program map table) packets for storing conversion table blocks is 22 packets or more;
(B) The interval from the PMT (Program Map Table) packet storing the conversion table block to the random playback start position (SPN_EP_Start) set in the next EP map is 22 packets or more,
The method of manufacturing an information recording medium according to claim 9 , wherein the conversion processing region determination process is performed so as to satisfy the condition. The conversion processing area determination step further includes:
(C1) A packet whose interval from the conversion table block storage PMT (program map table) packet is 11 packets or more is set as a preceding conversion processing area setting packet,
(C1) according to claim 10, characterized in that the step of performing the determination process of the preceding conversion processing area selecting and conversion regions packet interval is greater than 11 packets from the setting packet as a subsequent conversion process area setting packet 2. A method for producing an information recording medium according to 1. The conversion processing area determination step includes:
The conversion process area determination process is executed so as to satisfy the condition that the PMT (program map table) packet storing the conversion table block is set to 50 or less per second for the transport packet stream (TS) storing the content. The method of manufacturing an information recording medium according to claim 9 , wherein the method is a step. The conversion processing area determination step includes:
10. The information according to claim 9 , wherein the conversion processing area determination processing is executed so as to satisfy a condition that the number of bytes set in the conversion processing area per packet of the content composition stream is 25 bytes. Recording medium manufacturing method. The conversion processing area determination step includes:
Content to be recorded on the information recording medium
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the transformation processing having a large influence on the reproduction data is subjected to the conversion processing area determination processing so as to satisfy the condition that the conversion processing area is set as an area common to both methods (1) and (2). The information recording medium manufacturing method according to claim 9 , wherein the information recording medium manufacturing method is a step to be executed. The conversion processing area determination step includes:
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording content that is commonly used for both methods (1) and (2) above,
The conversion processing area to be subjected to the deformation process having little influence on the reproduction data is a step of determining as a conversion processing area to be applied only to at least one of both methods shown in the above (1) and (2). The method for producing an information recording medium according to claim 9 . The conversion processing area determination step includes:
Content to be recorded on the information recording medium
(1) A method of recording a conversion table as a conversion table block scattered in the content,
(2) A method of recording the conversion table as data independent of the content,
When recording individual content corresponding to each of the methods shown in (1) and (2) above,
For the first content, the first conversion processing area setting condition,
For the second content, the second conversion processing area setting condition,
The method of manufacturing an information recording medium according to claim 9 , wherein the conversion processing region determination processing is executed so as to satisfy the requirements individually. An information recording medium on which content is recorded,
Content that is stream data including content and has a conversion processing area that is subject to data conversion processing during playback processing;
A conversion table including conversion data as replacement data for the conversion processing area and position information of the conversion processing area;
Is an information recording medium that records
The conversion processing area is
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
A conversion processing area is set so as to satisfy at least one of the first or second conversion processing area setting conditions,
At least the second conversion processing area setting condition has an upper limit of 30 conversion processing areas determined based on the conversion table in units of 32 aligned units in which 32 aligned units are consecutive. And a conversion processing area is set in a manner that satisfies the condition,
When reproducing content from an information recording medium in a playback device, the position information and conversion data of the conversion processing area are acquired from the conversion table, and the conversion processing area is detected according to the position information and the conversion data is replaced. An information recording medium comprising recording data that can be made to be recorded. A computer program for generating data to be recorded on an information recording medium in an information processing apparatus,
A conversion processing region determination step for causing the conversion processing region determination unit to determine a position in the content to set a conversion processing region for executing the data conversion processing in the content reproduction processing;
A conversion table generating step for causing the conversion table generating unit to generate a conversion table including the conversion processing region information determined by the conversion processing region determining unit;
A data recording unit includes a content including the conversion processing area, and a data recording step of recording the conversion table on an information recording medium,
The conversion processing area determination step includes:
A first conversion processing area setting condition set corresponding to a method of recording the conversion table as a conversion table block scattered in the content, or
A second conversion processing area setting condition set corresponding to a method for recording the conversion table as data independent of the content;
A conversion process area determining process is executed so as to satisfy at least one of the first or second conversion process area setting conditions ;
In at least the second conversion processing area setting condition set in correspondence with the method of recording the conversion table as data independent of the content, 32 aligned units (32 aligned units) in which 32 aligned units are consecutive, including the condition number of the upper limit of the conversion processing region determined based on the conversion table is 30 points, a computer program, characterized in that the step of Ru to execute the process of determining the conversion region satisfying the conditions .