JP4062512B2 - Information processing apparatus and information processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention provides informationProcessing apparatus and information processing methodFor example, the present invention can be applied to a system related to a CD-ROM (Compact Disc Read Only Memory). The present invention is difficult to reproduce depending on the management information for managing the file, based on the position information generated from the management information.Content keyBy recording this, security can be improved as compared with the conventional case by simple management.
[0002]
[Prior art]
Conventionally, in a disk-shaped recording medium such as an optical disk and a hard disk, files recorded in the user area are managed by management information recorded in the management information area. For this reason, when reproducing a file recorded on this type of disc-shaped recording medium, the recording position information of the corresponding file is acquired based on the recording in the management information area, and the disc-shaped recording medium is read based on this recording position information. It is made to play.
[0003]
On the other hand, in the installation of the application program provided by the CD-ROM, by executing the setup file recorded on the CD-ROM, the files recorded on the CD-ROM are sequentially decompressed and the hard disk device of the computer. To be recorded.
[0004]
In installation of such an application program, illegal copying is prevented by inputting a serial number provided separately. Various methods have been proposed as a method for preventing such illegal copying. For example, in Japanese Patent Laid-Open No. 7-24364, each file is encrypted and necessary for decryption. A method of recording together with various key information has been proposed.
[0005]
[Patent Document 1]
JP 7-24364 A
[0006]
[Problems to be solved by the invention]
By the way, in such a method for preventing illegal copying by inputting a serial number or the like, there is a problem that management of the serial number or the like is complicated. Even when the key information or the like is recorded, there is a problem that it can be easily found based on the record in the management information area, so that sufficient security cannot be ensured.
[0007]
  The present invention has been made in consideration of the above points, and security can be improved as compared with the prior art by simple management.Information processing apparatus and information processing methodIs to try to propose.
[0008]
[Means for Solving the Problems]
  In order to solve this problem, in the invention of claim 1,A recording medium in which management information and a program are recorded is loaded, and is applied to an information processing apparatus that reads and executes the program from the recording medium, and the recording medium is loaded, and the management information and the recording medium are loaded from the recording medium. A drive for reading the program, and a processing unit for reading the program from the recording medium by the drive and executing the read program based on the management information read by the drive, the processing unit Determines whether or not a flag indicating content key recording is set in the management information. If the flag is set, the recording position information of the content key is detected by calculation processing of the management information. And acquiring the content key based on the detected recording position information and using the content key To run the program.
[0009]
  And claims5In the invention ofApplied to an information processing method in which a recording medium on which management information and a program are recorded is loaded, and the program is read from the recording medium and executed, the management information and the program are read from the loaded recording medium A read step; and a program execution step of reading the program from the recording medium by the read step based on the management information read by the read step and executing the read program. The step includes a content key determination step for determining whether or not a flag indicating recording of a content key is set in the management information. When the flag is set, the content is determined by the calculation processing of the management information. The key recording position information is detected, and based on the detected recording position information. There acquires the content key, and executes the program using the content key.
[0011]
  According to the configuration of claim 1 or claim 4, depending on the normal operating system of the computer, it is possible to set the content key to be reproduced and processed from an area that is observed as an empty area. The security can be improved as compared with the conventional case by simple management as compared with the case where illegal copying is prevented by providing a serial number or the like.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0014]
(1) Configuration of the embodiment
FIG. 1 is a block diagram showing a configuration of a disc master creating apparatus according to an embodiment of the present invention. The disc master production apparatus 1 exposes the disc master 2 by irradiating a disc master 2 having a surface coated with a resist with a laser beam. In the manufacturing process of the optical disk, the master disk 2 is developed to create a mother disk, then a stamper is created from the mother disk, and a CD-ROM is created using the stamper.
[0015]
In the disc master creating apparatus 1, the formatter 3 has various data necessary for creating a CD-ROM via the optical disc 4 and the like, a file F related to an application program provided to the user by the CD-ROM, and a content key KK. Provided. Here, the content key KK is information necessary for processing the file F. In this embodiment, a part of the file F recorded on the CD-ROM is decompressed using the content key KK. Yes.
[0016]
The formatter 3 constructs a volume structure of the CD-ROM from the data provided in this way and the information of the file F. Further, the formatter 3 creates management information with the volume structure thus constructed, and sequentially reads out and processes the management information, the file F recorded on the optical disc 4, and the like, thereby creating a pit string to be created on the CD-ROM. A modulation signal S1 whose signal level is switched corresponding to is generated.
[0017]
That is, in the formatter 3, the management information generation unit 5 generates and outputs management information with various data provided via the optical disc 4 and the like. Here, the management information is various pieces of information for managing the CD-ROM so that the files recorded on the CD-ROM can be reproduced. The management information generation unit 5 creates these management information in accordance with the regulations of ISO (International Organization for Standardization) 9660.
[0018]
Here, FIG. 2 is a chart showing the volume structure of the CD-ROM defined in this ISO9660. In this rule, a CD-ROM is assigned a system area, a volume descriptor group, a path table group, a directory, and a file in order from the top. Here, the system area is an area of the top 16 clusters, and is reserved for the system. The volume descriptor group is assigned a predetermined number of volume descriptors which are structures of one sector, and information related to the volume such as the creator, the location of the root directory, and boot information is assigned to the volume descriptor. Has been made. A plurality of path tables are assigned to the path table group. Here, the path table is a table in which directory information is recorded for high-speed directory search.
[0019]
Information about files and subdirectories is assigned to the directory, and the recording position, file name, data length, file flag, etc. of each file are assigned. Thereby, in this embodiment, the file recorded in the user area can be reproduced by the management information.
[0020]
The management information generation unit 5 does not record the content key KK in the directory, that is, depending on the management information, the management information is generated so that the portion where the content key KK is recorded is detected as a free area during reproduction. create. As a result, in this embodiment, depending on the normal operating system in the computer, the content key KK, which is information necessary for file processing that is difficult to reproduce, is recorded by the management information.
[0021]
When such a content key KK is recorded, an identifier indicating the recording of the content key KK is set in an undefined area in the management information recording area. It should be noted that such an identifier setting can be applied to, for example, a flag setting.
[0022]
The management information generation unit 5 sequentially outputs the management information generated in this way to the EFM signal generation circuit 11 at a predetermined timing.
[0023]
The key generation unit 7 generates the encryption key DK based on the management information generated by the management information generation unit 5. Specifically, in this embodiment, the key generation unit 7 generates an encryption key DK based on a basic volume descriptor (PVD: Primary Volume Descriptor) constituting a volume descriptor group. Here, basic information related to the volume is assigned to the basic volume descriptor. In addition to this basic volume descriptor, the volume descriptor is a secondary volume descriptor, volume partition descriptor, activation record, volume descriptor set. Consists of end terminals and the like.
[0024]
FIG. 3 is a chart showing the basic volume descriptor. In the basic volume descriptor, the first 1 byte is assigned to the volume descriptor name, and the subsequent 5 bytes are assigned to the standard identifier indicating the corresponding standard. In ISO9660, this standard identifier is set to “CD001”. Yes. The subsequent 1 byte is assigned to the version number of the volume descriptor, and the subsequent 1 byte is reserved for reservation. The subsequent 32 bytes are assigned to the system identifier and the volume identifier, respectively, and information indicating the size of the volume space, information relating to the path table, and the like are sequentially assigned.
[0025]
The key generation unit 7 calculates the sum of the data assigned to the basic volume descriptor, and generates the encryption key DK from the random number based on the basic volume descriptor by processing the value of the total with a predetermined arithmetic expression. To do. The key generation unit 7 outputs the encryption key DK to the encryption unit 9.
[0026]
The position information generation unit 8 generates the recording position information of the encryption key file in the same manner as the key generation unit 7. At this time, the recording position information is generated so that the encryption key file is recorded in the empty area formed in the CD-ROM. In other words, the position information generation unit 8 sequentially processes the sum of the data assigned to the basic volume descriptor using a plurality of arithmetic expressions with priorities set, and generates the address of the user area. Further, the position information generation unit 8 determines whether or not the address generated in this way is an address for specifying an area that is a free area formed in the CD-ROM, and records the content key KK based on this position information. It is determined whether or not an area to be secured can be secured. Through these processes, the position information generating unit 8 detects position information that can be recorded in the empty area, selects the detected position information according to the priority set in the arithmetic expression, and generates the recording position information of the content key KK. .
[0027]
The encryption unit 10 encrypts the content key KK with the encryption key DK generated by the key generation unit 7, and converts the encrypted data into a file. The encryption unit 10 outputs this file to the EFM signal generation circuit 11 at a timing corresponding to the recording position information generated by the position information generation unit 8.
[0028]
As a result, as shown in FIG. 4, in this embodiment, the recording position information AD indicating a part of the free area in the CD-ROM is generated from the management information by a predetermined calculation process, and depending on the management information, reproduction is difficult. A content key KK, which is information necessary for file processing, is recorded at a recording position based on the recording position information AD. At this time, the content key KK is also encrypted and recorded with the encryption key DK created from the management information by a predetermined calculation process. The management information generation unit 5, the key generation unit 7, the position information generation unit 8, and the encryption unit 10 are configured by, for example, arithmetic processing means provided in the formatter 3.
[0029]
In the formatter 3, the EFM signal generation circuit 11 receives the data of the file F obtained by reproducing the optical disc 4, the management information generated by the management information generation unit 5, and the file of the content key KK generated by the encryption unit 10. The data are sequentially input at corresponding timings, are blocked in units of a predetermined amount of data, are added with error correction codes, are then interleaved, and are further added with error correction codes. The EFM signal generation circuit 11 performs EFM (Eight to Fourteen Modulation) modulation on the data and the error correction code processed in this way, and then outputs a serial data string synchronized with the channel clock via a synchronization signal. At this time, the EFM signal generation circuit 11 also generates TOC (Table Of Contents) data and subcode data, processes the TOC data in the same manner, and appropriately inserts the subcode data. Process.
[0030]
The subsequent EFM signal output circuit 12 modulates the EFM modulation signal EFM output from the EFM signal generation circuit 11 to NRZI (Non Return to Zero Inverte) and outputs the result to the cutting machine 13.
[0031]
The cutting machine 13 irradiates the disc master 2 with a laser beam, and rotationally drives the disc master 2 with a constant linear velocity while sequentially changing the irradiation position of the laser beam from the inner circumference side to the outer circumference side of the disc master 2. To do. At this time, the cutting machine 13 performs on / off control of the laser beam applied to the disc master 2 by the laser driving circuit 14 in accordance with the modulation signal S1 output from the formatter 3. Thus, the cutting machine 13 sequentially creates an exposure locus corresponding to the modulation signal S1 on the disc master 2, and forms a pit row on the CD-ROM by this exposure locus.
[0032]
As a result, in this embodiment, the CD-ROM created from the master disc 2 is a recording position that is difficult to reproduce depending on the management information, is obtained from the management information by a predetermined calculation process, and is free according to the management information. A content key KK necessary for file processing is recorded at a partial recording position of the area. The content key KK is encrypted and recorded with an encryption key DK created from management information by a predetermined calculation process.
[0033]
FIG. 5 is a block diagram showing a computer that processes the CD-ROM created in this way. In the computer 20, a keyboard, a mouse, a monitor, and the like are connected to the bus BUS via an interface (I / F) 21. Also, an optical disk drive 23 for reproducing a CD-ROM is connected to the bus BUS under the control of a central processing unit (CPU) 22.
[0034]
The computer 20 secures a work area in the random access memory (RAM) 25 according to the recording in the read only memory (ROM) 24 and executes the processing program recorded in the hard disk drive (HDD) 26 by the central processing unit 22. Thus, various processes are executed in accordance with instructions from the user.
[0035]
In these processes, when the user gives an instruction to install the application program recorded on the CD-ROM, the central processing unit 22 executes the processing procedure of FIG. That is, when the installation instruction of the application program is instructed by the user, the central processing unit 22 proceeds from step SP1 to step SP2, and whether or not the flag indicating the recording of the content key KK is set from the management information of the CD-ROM. to decide. If a negative result is obtained here, the central processing unit 22 proceeds from step SP2 to step SP3, and executes a normal installation process similar to the conventional one by executing a setup program recorded on the CD-ROM. That is, the central processing unit 22 records each file recorded on the CD-ROM on the hard disk drive 26 and decompresses it, then creates an icon, etc., executes the setup process, and moves to step SP4 to execute this processing procedure. finish.
[0036]
On the other hand, if a positive result is obtained in step SP2, the central processing unit 22 moves to step SP5 and generates the encryption key DK by calculating the management information in the same manner as the processing in the formatter 3. In the subsequent step SP6, similarly to the processing in the formatter 3, the management information is arithmetically processed to detect the recording position information of the content key KK. In the subsequent step SP7, the central processing unit 22 sets the recording position information detected in this way as a parameter and issues a command for instructing the optical disc drive 23 to reproduce the CD-ROM. And the content key KK file is acquired.
[0037]
In subsequent step SP8, the central processing unit 22 processes the file of the content key KK obtained in this way with the encryption key DK generated in step SP5, and releases the encryption of the content key KK. In the following step SP9, for example, this content key is set as an argument, and execution is instructed to the setup program recorded on the CD-ROM, whereby the file relating to the application program recorded on the CD-ROM is transferred to the hard disk drive. 26 and decompressed with the content key KK. In subsequent step SP10, an icon or the like is created and a setup process is executed. Then, the process proceeds to step SP4 and the process procedure is terminated.
[0038]
(2) Operation of the embodiment
In the above configuration, in this embodiment, the CD-ROM layout is set by the formatter 3 of the disc master creating apparatus 1 based on the information of the file F provided from the optical disc 4, and the management information generation unit In 5, management information is generated. In the formatter 3, the management information is input to the EFM signal generation circuit 11 in a predetermined order and a predetermined format, and files recorded on the optical disc 4 are sequentially reproduced in an order corresponding to the management information, and the EFM signal generation circuit 11. The disc master 2 is sequentially exposed by the modulation signal S1 generated by these signals and a latent image is formed by a pit row. In this embodiment, the master disk 2 is developed to create a master disk, and a stamper and a CD-ROM are sequentially created from the master disk.
[0039]
In this way, when the file F and management information are recorded, the formatter 3 calculates a sum from the basic volume descriptor of the management information, and creates an encryption key DK by an arithmetic process using this sum. Similarly, the position information generation unit 8 generates recording position information indicating a part of the free area in the CD-ROM. In the formatter 3, the content key KK necessary for processing the file F recorded on the CD-ROM is encrypted by the encryption key DK, and this encryption is performed at a timing corresponding to the position information generated by the position information generating unit 8. The content key KK file thus formed is supplied to the EFM signal generation circuit 11.
[0040]
As a result, in this embodiment, the content key KK is recorded in an area that is determined to be a free area, which is difficult to find in a normal operating system that reproduces a file based on management information. Further, when the volume structures in the CD-ROM are different, the content key KK is recorded at different locations.
[0041]
Thus, for example, in comparison with the case where illegal copying is prevented by inputting a serial number or the like, there is no need to separately manage and distribute the data provided for such input. Can be improved. Moreover, in a normal operating system, it is difficult to find out, and if the volume structure is different, the content key KK is recorded in a different location when the volume structure is different. Can be improved.
[0042]
In addition, when the content key KK is recorded by being encrypted with the encryption key DK, and the encryption key DK is created by a calculation process using management information, the volume structure of the CD-ROM is different. It is encrypted with a different encryption key DK, which can further improve security.
[0043]
That is, in the case of a CD-ROM created from the disc master 2 in which the latent image is created in this way, when installed in a computer with a normal operating system, the recording position of the content key KK cannot be found. Even if it is discovered, the encryption of the content key KK cannot be released due to the inability to generate the encryption key DK, so that even if the file recorded on the CD-ROM is recorded on the hard disk drive, it functions normally. Thus, it is possible to prevent unauthorized use of the application program supplied by this CD-ROM.
[0044]
Also, when copying this CD-ROM, even if the content key KK cannot be copied or copied by transferring it in file units and recording it on a CD-R or the like. Depending on the management information, the recording position cannot be specified. Thus, in this embodiment, illegal copying can be surely prevented.
[0045]
On the other hand, in the computer 20 corresponding to the legitimate user, the recording position information of the content key KK is obtained by calculating the management information in the same manner as the calculation processing in the formatter 3, and this recording position information is used as the parameter. The file of the content key KK recorded on the CD-ROM is reproduced by the command set in (1). Similarly, an encryption key DK is generated, and the encryption of the content key KK is released by this encryption key DK. Further, each file recorded on the hard disk drive is decompressed by this encryption.
[0046]
As a result, the computer 20 corresponding to the authorized user can correctly install the application program recorded on the CD-ROM and execute the application program without inputting any serial number or the like.
[0047]
(3) Operation of the embodiment
According to the above configuration, it is difficult to reproduce depending on the management information for managing the file, and by recording the information necessary for processing the file in the free space based on the recording position information generated from this management information, simple management is possible. Therefore, security can be improved as compared with the conventional case.
[0048]
Further, by generating an encryption key from the management information by a predetermined calculation process, and encrypting and recording information necessary for file processing using this encryption key, security can be further improved.
[0049]
Moreover, by setting an identifier indicating the recording of information necessary for processing such a file in the management information, information necessary for processing the file can be quickly acquired during reproduction.
[0050]
(4) Other embodiments
In the above-described embodiment, the case where the recording position information and the encryption key are generated from the sum of the basic volume descriptors in the management information has been described. However, the present invention is not limited to this, and is set to, for example, the basic volume descriptor. The recording position information and encryption key may be generated from various items set in the basic volume descriptor, such as the logical block length, volume creation date and time, and the recording position from other information of the management information. Information and an encryption key may be generated. In this case, the management information serving as a generation reference may be different between the recording position information and the encryption key.
[0051]
In the above-described embodiment, the case where the content key KK is recorded in one place has been described. However, the present invention is not limited to this, and the content key KK may be divided and recorded in a plurality of places. In addition, encryption may be performed using different encryption keys.
[0052]
In the above embodiment, the case where the content key KK is recorded in the empty area of the user area has been described. However, the present invention is not limited to this, and the content key KK may be recorded in the empty area of the management information recording area. .
[0053]
In the above-described embodiment, the case where the content key KK is simply encrypted and recorded has been described. However, the present invention is not limited to this. For example, the content key KK may be encrypted after being disturbed by a scramble process and then encrypted. The present invention can be widely applied in the case of recording by a combination with various processes.
[0054]
In the above-described embodiment, the case has been described in which the content key recording position information is generated after the CD-ROM layout has been determined. However, the present invention is not limited to this. The recording position information of the content key may be generated. In this way, it is possible to generate content key recording position information using a single arithmetic expression without preparing a plurality of arithmetic expressions with priorities set as described above.
[0056]
Further, although cases have been described with the above embodiment where the present invention is applied to installation of application programs, the present invention is not limited to this and can also be applied to file management based on management information. That is, in this case, for example, in a corresponding computer, a file corresponding to the content key may be processed as a visible file.
[0057]
In the above-described embodiment, the case of creating a CD-ROM according to the ISO 9660 standard has been described. However, the present invention is not limited to this, and when creating a CD-ROM according to the UDF (Universal Disk Format) standard, When a CD-ROM is created by a bridge between ISO9660 and UDF, it can be widely applied to various recording media such as DVD (Digital Video Disk), DVD next-generation disk, magneto-optical disk, memory card and the like. it can.
[0058]
In the above-described embodiment, the case where the present invention is applied when providing an application program has been described. However, the present invention is not limited to this, and the present invention is also widely applied when providing, for example, music content and video content. be able to.
[0059]
【The invention's effect】
  As described above, according to the present invention, it is difficult to reproduce depending on the management information for managing the file, based on the recording position information generated from this management information.Content keyBy recording, security can be improved as compared with the conventional case by simple management.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a disc master creating apparatus according to an embodiment of the present invention.
FIG. 2 is a chart showing a volume structure of a CD-ROM.
FIG. 3 is a chart showing a basic volume descriptor of a CD-ROM.
4 is a schematic diagram for explaining processing of a content key by the disc master creating apparatus of FIG. 1; FIG.
5 is a block diagram showing a computer that reproduces a CD-ROM by the disc master production apparatus of FIG. 1. FIG.
6 is a flowchart showing a processing procedure of a central processing unit in the computer of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disc master production apparatus, 2 ... Disc master, 3 ... Formatter, 5 ... Management information generation part, 7 ... Key generation part, 8 ... Position information generation part, 10 ... Encryption part, 11 ...... EFM signal generation circuit, 12 ... EFM signal output circuit, 20 ... Computer, 22 ... Central processing unit

Claims (8)

In an information processing apparatus in which a recording medium in which management information and a program are recorded is mounted, and the program is read from the recording medium and executed.
A drive that is loaded with the recording medium and reads the management information and the program from the recording medium;
A processing unit that reads the program from the recording medium by the drive based on the management information read by the drive, and executes the read program;
The processing unit is
Determining whether a flag indicating recording of a content key is set in the management information;
When the flag is set, the content key recording position information is detected by the management information calculation process, the content key is acquired based on the detected recording position information, and the content key is used. And executing the program. The content key is
Encrypted and recorded on the recording medium,
The processing unit is
When the flag is set in the management information,
An encryption key is generated based on the management information,
The information processing apparatus according to claim 1, wherein the program is executed using the content key after decrypting the content key using the generated encryption key. The information processing apparatus according to claim 1, wherein the management information is a volume descriptor. The content key is
Divided into multiple locations, each is encrypted and recorded,
The processing unit is
The information processing apparatus according to claim 3, wherein the encryption of each content key recorded in a divided manner is released using a different encryption key. In an information processing method in which a recording medium in which management information and a program are recorded is mounted, and the program is read from the recording medium and executed.
A step of reading out the management information and the program from the mounted recording medium;
Based on the management information read in the reading step, the program reading step for reading the program from the recording medium by the reading step and executing the read program,
The program execution step includes:
A content key determination step for determining whether or not a flag indicating the recording of the content key is set in the management information;
When the flag is set, the management information calculation process detects the content key recording position information, acquires the content key based on the detected recording position information, and uses the content key. An information processing method characterized by executing the program. The content key is
Encrypted and recorded on the recording medium,
The program execution step includes:
When the flag is set in the management information,
An encryption key is generated based on the management information,
The information processing method according to claim 5, wherein the program is executed using the content key after the content key is decrypted using the generated encryption key. The information processing method according to claim 5, wherein the management information is a volume descriptor. The content key is
Divided into multiple locations, each is encrypted and recorded,
The program execution step includes:
The information processing method according to claim 6, wherein the encryption of each content key recorded separately by using different encryption keys is released.

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