JP2001184787A - Information recording medium, device and method for recording/reproducing information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording medium, with which security can be provided for the unit of a medium or sector and data can not be read easily by a user except a regular user. SOLUTION: Concerning an information recording medium 10 having a plurality of sectors 100 respectively having a sector header area 101 for storing a sector number and a data area 102 for recording user data, the user data to be recorded are recorded after being scrambled by a scramble key for data generated while using the sector number recorded in the sector header area 101 of a sector to record these data and a medium peculiar number applied to the information recording medium 10. Besides, the medium peculiar number is recorded while being scrambled by a scramble key generated by the sector number of a sector, where the number is recorded, and predetermined fixed data as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium comprising a plurality of sectors each comprising a sector header area and a data area, an information recording / reproducing apparatus for recording and reproducing data on and from the information recording medium, and And a method of recording and reproducing data on the information recording medium. In particular, an information recording medium and an information recording / reproducing apparatus that can record / reproduce data scrambled using a scramble key generated using a sector number and a medium unique number assigned to each information recording medium. The present invention relates to an apparatus and an information recording / reproducing method.

[0002]

2. Description of the Related Art As a method for recording data on an information recording medium in a form that cannot be illegally reproduced, there is a method in which data is subjected to scramble processing or encryption processing and then recorded on the information recording medium. Unauthorized reproduction cannot be performed on data recorded after being subjected to scramble processing or encryption processing.

As a conventional example of a technique for recording data after encrypting the data, there is an encryption method disclosed in Japanese Patent Application Laid-Open No. 7-249264. In this system, CD-R
When recording the encrypted data in the OM, the encryption key used for the data encryption processing is recorded in a sector different from the sector where the encrypted data is recorded. When reproducing data, first, the user instructs the reproducing apparatus to read the encryption key via the personal computer. Then, the reproducing device reads the encryption key from the CD-ROM, decrypts the encrypted data using the read encryption key, and reproduces the data. The advantage of this method is that the encryption key can be easily changed.

As a conventional example of a technique for recording data by performing a scramble process on the data, there is a physical format standard for DVD.

[0005]

However, in the above-mentioned encryption method, since the encryption key is recorded in the sector in the same manner as the data, it is possible to use a device such as a general personal computer which can read a CD-ROM. Since the recorded encryption key and encrypted data can be easily read, there is a high risk that the encryption key will be decrypted. In addition, one of the sectors is used exclusively for recording the encryption key (that is, data cannot be recorded in the sector), so that the recording efficiency of the information recording medium is low.

[0006] The scrambling process specified in the DVD physical format standard aims at reducing crosstalk between adjacent tracks (that is, not for copyright protection). Therefore, data scrambled and recorded according to this physical format standard can be reproduced by all reproduction devices conforming to this standard, and illegal reproduction cannot be prevented.

Accordingly, the present invention provides an information recording / reproducing apparatus and method for encrypting or scrambling data in a form that cannot be easily deciphered, and an information recording / reproducing apparatus in which data is stored by such an apparatus or method. The purpose is to provide a medium.

[0008]

In order to achieve the above object, an information recording medium according to the present invention has a first sector in which a sector number is added and a medium unique number unique to the information recording medium is recorded. And a plurality of second sectors each having a different sector number added thereto and recording user data. The user data recorded in the second sector is a second sector in which the user data is recorded. The data is scrambled by a data scramble key generated based on the sector number of the sector and the medium unique number.

According to the information recording medium of this configuration, the user data can be scrambled with a different data scrambling key for each individual information recording medium and even for each sector within the same information recording medium. Unauthorized reading is not easily performed. To achieve the above object, the information recording apparatus of the present invention comprises a first sector in which a medium unique number is recorded in advance, and a plurality of second sectors in which a unique sector number is added and user data is recorded. An information recording apparatus for recording user data after scramble processing on an information recording medium having a random number sequence initial value based on a sector number of a sector in which user data is to be recorded and the medium unique number. , A random number generating means for generating a random number sequence based on the initial value, a scrambling means for scrambling user data using the random number sequence, and a user data scrambled by the scrambling means. And data recording means for recording data in the data area of the sector.

In order to achieve the above object, an information recording method according to the present invention comprises a first sector in which a medium unique number is recorded in advance and a plurality of sectors in which a unique sector number is added and user data is recorded. An information recording method for recording user data on an information recording medium having a second sector after scrambling, based on a sector number of the second sector in which user data is to be recorded and the medium unique number. An initial value generating step of generating an initial value of a random number sequence;
A random number generation step of generating a random number sequence based on the initial value; a scrambling step of scrambling user data using the random number sequence; and a user area scrambled in the scrambling step. And a data recording step of recording in

According to another aspect of the present invention, there is provided an information reproducing apparatus for recording a first sector in which a medium unique number is recorded in advance, and a scrambled user data to which a unique sector number is added. An information reproducing apparatus for reproducing user data recorded on an information recording medium having a plurality of second sectors, wherein a sector number of a second sector on which user data to be reproduced is recorded and the medium Initial value generating means for determining an initial value of a random number sequence from a unique number, random number generating means for generating a random number sequence based on the initial value, and reproducing means for descrambling user data using the random number sequence; , Is characterized.

According to another aspect of the present invention, there is provided an information reproducing method for recording a first sector in which a medium unique number is recorded in advance and a scrambled user data to which a unique sector number is added. An information reproducing method for reproducing user data recorded on an information recording medium having a plurality of second sectors, comprising: a sector number of a second sector on which user data to be reproduced is recorded; An initial value generating step of determining an initial value of a random number sequence from a unique number, a random number generating step of generating a random number sequence based on the initial value, and a reproducing step of descrambling user data using the random number sequence When,
It is characterized by having.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A first embodiment of an information recording medium and an information recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the appearance and usage of an information recording medium and an information recording / reproducing apparatus according to the present invention. The information recording / reproducing device 20 includes a personal computer 30
(Hereinafter, “PC30”), and the user
The information obtained or created by using the C30 is recorded on the information recording medium (optical disc) 10, or the information recorded on the information recording medium 10 is reproduced and presented to the user via the PC 30. The information recording / reproducing device 20
After scrambling the data, the information recording medium 10
And performs a descrambling process upon reproduction. (Information Recording Medium 10) FIG. 2 shows a data structure of the information recording medium 10 according to the present invention. The structure of the information recording medium 10 is such that a plurality of sectors 100 are arranged between a lead-in area 110 and a lead-out area 120.
The user data scrambled by the information recording / reproducing device 20 is stored in the sector 100.

The sector 100 further includes a sector header area 101 for storing control information such as sector numbers (0 to N) uniquely assigned to each sector, and a data area 102 as a user data storage area. You. The capacity of the data area 102 is 2048 bytes. In FIG. 2, the medium unique number 140 is stored in the data area 102a of the sector 100a whose sector number is "a" among a plurality of sectors. The medium unique number 140 is a unique number given to each information recording medium at the time of manufacture. Like the user data, the medium unique number 140 is also scrambled by the information recording / reproducing device 20 and stored in the sector 100a. However, the size of the medium unique number 140 is 4 bytes (3
(2 bits), the user data is stored in the data area 102a together with the medium unique number 140.

Here, the user data and the medium unique number 14
The relationship with 0 will be described. As described above, the user data is stored in any one of the sectors 100 after being scrambled, and the scramble key in the scramble processing includes the medium unique number 140 and the sector number of the sector in which the data is to be stored. Generated from Note that the scramble key used for the scramble processing of the medium unique number 140 is generated using different information. Details of the scramble processing will be described in the description of the information recording / reproducing apparatus 20. (Information recording / reproducing device 20) Information recording / reproducing device 20
According to an instruction from a user, records information on the information recording medium 10, reads information from the information recording medium 10,
It performs playback and includes a component for managing an interface with a user or the PC 30, a component for performing recording processing, a component for performing read / reproduction processing, and the like.
Characteristic processes include a “data recording unit” that performs scramble processing of user data, a “medium number recording unit” that performs scramble processing of a medium unique number, and a “medium number reproduction” that performs descrambling processing of a medium unique number. And a "data reproducing unit" for performing descrambling and reproduction of user data.

Hereinafter, these four components will be sequentially described. (Data recording unit) The data recording unit receives the user data to be recorded on the information recording medium, the sector number of the sector in which the user data is to be recorded, and the medium unique number of the information recording medium. A scramble key is generated from the number, user data is scrambled using the scramble key, and written to the sector.

FIG. 3 is a block diagram showing the configuration of the data recording unit 21. The data recording unit 21 includes an initial value determining unit 211 that determines an initial value of a random number used for scrambling the user data recorded in the sector from the sector number of the sector in which the user data is to be stored and the medium unique number, A random number generator 212 that generates a random number for each byte of user data based on the initial value of the random number determined by the initial value determiner 211, and scrambles the user data byte by byte using the random number generated by the random number generator 212. Processing unit 213 for writing the user data after the scramble processing to the information recording medium 10
Consists of four.

An initial value determining unit 211 generates a reference data generating unit 215 for generating table reference data from a sector number and a medium unique number inputted from the outside, and associates a plurality of random number initial value candidates with the table reference data. Search unit 2 for obtaining an initial value of a random number by searching the initial value table 216 using the table reference data generated by the reference data generating unit 215 as a key and storing the initial value table 216 stored in a predetermined form.
17. The reference data generation unit 215 generates 32-bit data by performing XOR (exclusive OR) for each bit with respect to the sector number and the medium unique number, both of which are 32-bit data, and generates the lower 10 bits. Is output to the search unit 217 as table reference data.

As described above, the sector number is unique for each sector, and the random number initial value is uniquely determined from the sector number and the medium unique number. FIG. 4 shows the reference data generation unit 21.
FIG. 5 schematically shows a configuration provided for obtaining an exclusive OR of a sector number and a medium unique number. 32
Bit S0 of the sector number is assigned to each of the XOR circuits.
To S31 and one of the bits M1 to M31 of the medium unique number are input, and the 32-bit data P0 of the operation result is input.
To P31 are output. The lower 10 bits P0 to P9 are output to the search unit 217 as table reference data.

FIG. 5 is a diagram showing the initial value table 216. In the initial value table 216, 1024 unique random number initial values of 15 bits in size are stored corresponding to possible values (0 to 1023) of the table reference data. The search unit 217 reads the random number initial value corresponding to the value of the table reference data from the initial value table 216, and outputs it to the random number generation unit 212.

The random number generation unit 212 processes a random number initial value for each byte of user data to generate a unique random number, and outputs the generated random number to the scramble processing unit 213. FIG. 6 is a diagram illustrating an outline of an arithmetic processing unit provided for the random number generation unit 212 to generate a random number. Each time the sector number is updated, the search unit 217 is stored in the 15-bit data storage area 601.
The random number initial value 602 read by is stored. Here, when a clock signal is input from an external clock generation unit (not shown), 1 in the data storage area 601 is read.
The 5-bit data is shifted left by one bit. further,
In the rightmost one bit R0 of the data storage area 601, the logical sum of the values of the other two bits R14 and R10 is stored. Then, the lower 8 bits (R0 to R7) of the 15-bit data resulting from this processing are output to the scramble processing unit 213 as random numbers. Note that the cycle of the clock signal input to the random number generation unit 212 matches the cycle of the user data input to the scramble processing unit 213 one byte at a time.

The scramble processing section 213 scrambles user data input one byte (8 bits) at a time, using random numbers output from the random number generation section 212. The scrambled user data is output to the data writing unit 214 and recorded in the data area 102. The scramble process is an exclusive OR operation.

FIG. 7 shows an arithmetic section provided for the scramble processing by the scramble processing section 213. 8 XOs
To each of the R circuits, one of the bits R0 to R7 of the random number and one of the bits d0 to d7 of the user data are input,
Data Sd0 to Sd7 after scramble processing of the operation result are output. Random number generator 212, scramble processor 21
3. The processing of the data writing unit 214 is repeated for each user data to be recorded, one byte at a time, until the recording of all data is completed. (Medium Number Recording Unit) The medium number recording unit scrambles a medium unique number used for generating a scramble key for user data, and records the scrambled key in a dedicated sector. The scrambling process and writing of the medium unique number by the medium number recording unit are performed prior to the first data recording process on the information recording medium 10. The medium number recording unit generates a scramble key for the medium unique number from the sector number of the sector for the medium unique number and fixed data common to all information recording media, and scrambles the medium unique number using the scramble key. Then, write to the sector.

FIG. 8 is a block diagram showing the configuration of the medium number recording unit 22. Except that the processing target is the medium specific number, the content of the processing is the same as that of the data recording unit 21, and thus the configuration is almost the same as that of the data recording unit 21. The medium number recording unit 22 includes an initial value determination unit 221 for determining an initial value of a random number used for scrambling the medium unique number from the sector number of the sector for storing the medium unique number and fixed data common to the information recording medium. Value determination unit 22
A random number generator 222 that generates a random number for each byte of the medium unique number based on the initial value of the random number determined by 1; scrambling that scrambles the medium unique number one byte at a time using the random number generated by the random number generator 222 Processing unit 223,
The medium unique number after the scramble processing is stored in the information recording medium 10.
Writing unit 2 for writing to the medium unique number storing sector
24. The fixed data is 32-bit data.

An initial value determining unit 221 generates a reference data generating unit 225 for generating table reference data from the sector number of a medium unique number storing sector input from the outside and the fixed data, and a plurality of random number initial value candidates. And a search unit 227 that searches the initial value table 226 using the table reference data as a key to obtain an initial value of a random number. The processing contents of the reference data generating unit 225 and the searching unit 227 and the configuration of the initial value table 226 are the same as the processing contents of the reference data generating unit 215 and the searching unit 217 of the data recording unit 21 and the configuration of the initial value table 216, respectively. Description is omitted.

The processing of the random number generating section 222 is the same as that of the random number generating section 212 of the data recording section 21 and will not be described.
The processes of the scramble processing unit 223 and the data writing unit 224 are the same as those of the scramble processing unit 213 and the data writing unit 214 of the data recording unit 21, respectively. Since the length of the medium unique number to be scrambled is fixed to 32 bits (4 bytes), the scramble processing for each byte is repeated four times, and the medium unique number after scrambling is:
The data is stored in a 4-byte area from the beginning in the data area 102 of the dedicated sector. (Medium Number Playback Unit) The medium number playback unit stores the original medium unique number obtained by descrambling the scrambled medium unique number stored in the dedicated sector into the above-described data recording unit 21 or described later. Output to the data reproduction unit. When the user data is recorded on the information recording medium 10, the medium unique number is output to the data recording unit 21, and when the user data is read and reproduced from the information recording medium 10, it is output to the data reproducing unit.

The processing performed by the medium number reproducing unit is the reverse of the processing performed by the medium number recording unit 22. That is, the medium number recording unit 22 scrambles the original mediation unique number (A) with a random number, that is, a scramble key (B), to obtain a scrambled medium unique number (C) (A + B).
On the other hand, the medium number reproducing unit obtains the original medium unique number (A) by descrambling the medium unique number (C) after the scramble processing using a random number, that is, a descrambling key (B) (C + B). → A). In this case, the original medium unique number cannot be obtained unless the descramble processing is performed with the same random number used in the scramble processing.

FIG. 9 is a block diagram showing the structure of the medium number reproducing unit 23. The content of the processing is almost the same as that of the medium number recording unit 22. In particular, the processing up to obtaining a random number (descrambling key) from the sector number of the sector for storing the medium unique number and fixed data common to the information recording medium is as follows. The configuration is the same. The medium number reproducing unit 23 determines an initial value of a random number used for the descrambling process.
1. a random number generator 222 that generates a random number based on the initial value of the random number determined by the initial value determiner 221;
A descrambling unit 233 for descrambling the scrambled medium unique number one byte at a time using the random number generated by the unit, reproduces the original medium unique number from the result of the descrambling processing, and stores the data in the data recording unit 21 or the data reproducing unit. And a reproduction unit 234 for outputting the data to

Initial value determining unit 221 and random number generating unit 22
The contents of the process 2 are as described above. The descrambling unit 233 decodes the original medium unique number from the same random number used in the scramble processing and the medium unique number after the scramble processing. Specifically, an exclusive OR of both is obtained. The configuration for obtaining the exclusive OR is the same as that of the scramble processing unit 223 of the medium number recording unit 22 (that is, the scramble processing unit 213 of the data recording unit 21; see FIG. 7). The descrambling process is performed four times, one byte at a time, to obtain the original medium unique number. (Data reproducing unit) The data reproducing unit generates a descrambling key (random number) from the sector number of the sector in which the scrambled user data to be reproduced is stored and the medium unique number output from the medium number reproducing unit 23. Then, the user data is reproduced from the user data after the scramble processing by using the generated user data, and is output to the PC 30.

The processing performed by the data reproducing unit is the reverse of the processing performed by the data recording unit 21. That is, the scrambled user data (C) is descrambled with a random number (B) to obtain the original user data (A) (C
+ B → A). For the descrambling process, the same random numbers used in the scrambling process are used. FIG. 10 is a block diagram showing a configuration of the data reproducing unit 24. The details of the processing are almost the same as those of the data recording unit 21. In particular, the processing up to obtaining the random number from the sector number and the medium unique number has the same configuration. The data reproducing unit 24 determines an initial value of a random number used for the descrambling process by an initial value determining unit 21.
1. a random number generator 212 that generates a random number based on the initial value of the random number determined by the initial value determiner 211;
The descrambling unit 243 descrambles the scrambled user data one byte at a time using the random numbers generated by the PC, and reproduces the original user data from the result of the descrambling process and outputs it to the PC 30.

The processing contents of the descramble processing unit 243 are described in the scramble processing unit 21 in the data recording unit 21.
3 is the same as the processing content. Scrambled user data and random number generator 21 input one byte at a time
By performing an exclusive OR operation with the 1-byte random number generated by 2, 1-byte user data is reproduced to a value before scrambling.

The reproducing unit 244 temporarily stores the user data output from the descramble processing unit 243 one byte at a time, and outputs the user data to the PC 30 while controlling the transmission rate. (Summary) As described above, in the information recording medium 10 on which the user data is recorded by the information recording / reproducing apparatus 20 in the present embodiment, the information is separately generated for each sector using the medium unique number unique to the information recording medium 10. The user data is scrambled using the random number (scramble key). Therefore, even if the scramble key is decrypted in one information recording medium, the user data recorded in another information recording medium is not illegally read. Even in a single information recording medium, even if the scramble key is decrypted for a certain sector, the user data recorded in another sector is not illegally read. That is, security can be realized in units of media and sectors, and it is difficult for anyone other than an authorized user to easily read data.

Further, the medium unique number itself is scrambled using the scramble key generated by the fixed data and the sector number and then recorded on the information recording medium 10, so that a high level of security is realized and an unauthorized Data reading becomes difficult. Note that the scrambling process of the medium unique number may be performed in advance when the information recording medium is manufactured. In that case, the above-described medium number recording unit 22
Is not a part of the information recording / reproducing device 20 but an independent device.

If the contents of the initial value table for determining the initial value of the random number are made unique for each information recording / reproducing apparatus, the user recorded on the information recording medium using a certain information recording / reproducing apparatus can be used. Since data cannot be reproduced by another information recording / reproducing device, security can be realized for each information recording / reproducing device. (Embodiment 2) Hereinafter, a second embodiment according to the present invention will be described. Since there are many parts common to the first embodiment, only different parts will be described. A feature of the present embodiment is a part relating to a process of determining a random number initial value used for a random number generation process in the data recording unit and the data reproducing unit. The details will be described below with reference to the drawings. (Data Recording Unit) FIG. 11 is a block diagram showing the configuration of the data recording unit 60 in the present embodiment. The difference from the data recording unit 21 (see FIG. 3) in the first embodiment is an initial value determination unit 600 and a data writing unit 610. In the initial value determination unit 600, the processing of the reference data generation unit 215 is the same as that of the first embodiment. What is different is that a plurality of initial value tables 601, 602, and 603 are provided, and one initial value table to be searched by the search unit 604 using reference data as a key is determined based on a table selection signal input from the outside. Is to decide. In the following description, it is assumed that the user data stored on the information recording medium is of three types: image data, audio data, and character data.

Initial value tables 601, 602, 603
Are for image data, audio data, and character data, respectively. The configuration of each initial value table is the same as the initial value table 216 in the first embodiment. The content of each stored initial value data is unique in each table and also unique in all three tables.

The processing from the generation of the table reference data by the reference data generation unit 215 based on the sector number and the medium unique number to the output of the table reference data to the search unit 604 is the same as that of the first embodiment. The search unit 604 searches one of the initial value tables using the table reference data as a key, and outputs the obtained random number initial value to the random number generation unit 212. The search unit 604 selects one of the initial value tables according to the value of the table selection signal input to the initial value determination unit 600 together with the sector number and the medium unique number.

The table selection signal can take three types of values, each corresponding to one of the user data types of image data, audio data, and character data. Information indicating the type of user data is stored in header information of the user data. It is necessary to store information (the value of the table selection signal) for specifying the used initial value table so that the data reproducing unit described later can refer to the used initial value table at the time of descrambling processing. Therefore, search unit 604 outputs the value of the table selection signal to data writing unit 610, and
Reference numeral 10 records the value of the table selection signal in the sector header area 101 of the same sector in which the user data is stored.

Hereinafter, the processing contents of the random number generation unit 212 and the scramble processing unit 213 and the contents of the write processing of the data after the scramble processing by the data writing unit 610 are the same as those in the first embodiment. (Data Reproducing Unit) Next, a data reproducing device that reproduces the scrambled user data recorded by the data recording unit 60 will be described with reference to the drawings.

FIG. 12 is a block diagram showing a configuration of the data reproducing section 70 in the present embodiment. Embodiment 1
Is different from the data reproducing unit 24 (see FIG. 10) in the initial value determining unit 700. In the initial value determination unit 700, the processing of the reference data generation unit 215 is the same as in the first embodiment. The difference is that a plurality of initial value tables 601,
602 and 603, and that the search unit 704 determines one initial value table to be searched using reference data as a key based on a table selection signal input from the outside.

Initial value tables 601, 602, 603
Are the same as those held by the data recording unit 60. The process from the generation of the table reference data by the reference data generation unit 215 based on the sector number and the medium unique number to the output of the table reference data to the search unit 704 is the same as that of the first embodiment.

The search unit 704 searches one of the initial value tables using the table reference data as a key and outputs the obtained random number initial value to the random number generation unit 212. Search unit 704
Selects one of the initial value tables according to the value of the table selection signal read from the sector header area 101 of the sector in which the descrambled user data after the scramble processing has been stored by the data reproducing unit 70.

This table selection signal is used at the time of scrambling, and is recorded by the data writing section 610 in the sector together with the scrambled user data at the time of data recording by the data recording section 60. . Hereinafter, the processing contents of the random number generation unit 212, the descramble processing unit 243, and the reproduction unit 244 are the same as those in the first embodiment.

(Summary) As described above, according to the present embodiment, the three elements related to the generation of the scramble key (random number) are the sector number, the medium unique number, and the table selection signal (data type). The possibility that the scramble key is decrypted and the data is illegally read can be further reduced.

In the present embodiment, the initial value table is provided for each type of user data. However, the initial value table may be provided for each application type and / or version. In addition, it is conceivable that each information recording / reproducing apparatus has an initial value table corresponding to the type of data that can be processed or an application to record / reproduce user data.

FIG. 13 shows a data reproducing section 80 of an information recording / reproducing apparatus in which reproduction of only two types of data, image and sound, is permitted. This apparatus includes an initial value table 601 and an initial value table 601 corresponding to the image and audio data for which reproduction is permitted.
02 only. For this reason, regarding the character data scrambled by the data recording unit 60 shown in FIG.
3, the descramble key cannot be generated,
Therefore, reproduction is also impossible. By doing so, the type and number of the initial value tables provided to the information recording / reproducing device can be
By making the device correspond to the data type or application permitted to be used by the device, it becomes impossible to exchange information recording media between information recording / reproducing devices having different data types and applications permitted to be used.

The medium unique number may be recorded in a plurality of sectors. If the data is recorded in only one sector, the user data cannot be reproduced if the part of the medium where the medium unique number is recorded is damaged. The danger that occurs is smaller. Note that information such as the fixed data and the sector number of the sector storing the medium unique number is stored in the lead-in area. These pieces of information are recorded on an information recording medium by a stamper.

[0047]

As is clear from the above description, the information recording medium of the present invention is different from the first sector in which a sector number is added and a medium unique number unique to the information recording medium is recorded. And a plurality of second sectors on which user data is recorded, wherein the user data recorded on the second sector is the sector number of the second sector on which the user data is recorded. And a data scramble key generated based on the media unique number and the data scramble key.

According to the information recording medium having this configuration, the user data can be scrambled with a different data scrambling key for each information recording medium and even for each sector within the same information recording medium. Unauthorized reading is not easily performed. Also, where
The data scramble key is a random number sequence whose initial value is a value generated based on the sector number of the second sector and the medium unique number. It may be determined that the data and the data are subjected to a predetermined arithmetic processing and are scrambled.

According to this configuration, the scrambling process can be performed while changing the data scramble key for each byte of the user data, so that stricter security can be realized.
Here, the medium unique number may be scrambled by a medium number scramble key generated based on a sector number unique to a first sector and predetermined fixed data. .

According to this configuration, since the medium unique number used for generating the data scramble key is also recorded in a scrambled form, the medium unique number cannot be easily decrypted. Security will be stricter. In this case, user data may be recorded in the first sector together with the medium unique number.

According to this configuration, the data area of the sector in which the medium unique number is recorded can be effectively used.
Here, the fixed data may be recorded in a lead-in area of the information recording medium. According to this configuration, only a legitimate user who can read the fixed data can acquire the medium unique number and descramble the user data, so that strict security can be realized.

Further, the information recording apparatus of the present invention has an information recording medium having a first sector in which a medium unique number is recorded in advance and a plurality of second sectors in which a unique sector number is added and user data is recorded. An information recording apparatus for recording user data after scramble processing, wherein an initial value generation for generating an initial value of a random number sequence based on a sector number of a sector in which user data is to be recorded and the medium unique number Means, random number generation means for generating a random number sequence based on the initial value, scramble means for scrambling user data using the random number sequence, and user data scrambled by the scramble means for data area of the sector. And a data recording means for recording the data in the memory.

According to the information recording apparatus having this configuration, the user data can be scrambled with the data scramble key which is different for each individual information recording medium and even for each sector even within a single information recording medium. The data can be recorded in such a manner that unauthorized reading of the data is not easily performed. Further, with respect to this information recording device, type information indicating a data type is added to the user data, and the initial value generating means has a plurality of types of initial value tables corresponding to the contents of the type information, There is further provided a table selecting means for selecting one of the plurality of initial value tables according to the contents of the type information, and the searching means obtains an initial value by searching the initial value table selected by the table selecting means. It can also be.

According to the information recording apparatus having this configuration, the initial value of the random number sequence can be switched according to the type of the user data, so that security for each type of user data can be realized. For example, if the user data is an application, security for each application can be secured for a plurality of applications recorded on the same information recording medium.

Further, the information recording method of the present invention is directed to an information recording medium having a first sector in which a medium unique number is recorded in advance and a plurality of second sectors in which a unique sector number is added and user data is recorded. An information recording method for recording user data after scramble processing, wherein an initial value of a random number sequence is generated based on a sector number of a second sector in which user data is to be recorded and the medium unique number. A value generation step, a random number generation step of generating a random number sequence based on the initial value, a scramble step of scrambling the user data using the random number sequence, and the user data scrambled in the scramble step. And a data recording step of recording in a data area of two sectors.

According to such an information recording method, user data can be scrambled with a data scramble key which is different for each individual information recording medium and even for each sector even within a single information recording medium. The data can be recorded in such a manner that unauthorized reading of the data is not easily performed. Also, the information reproducing apparatus of the present invention has an information having a first sector in which a medium unique number is recorded in advance, and a plurality of second sectors in which user data to which a unique sector number is added and scrambled is recorded. An information reproducing apparatus for reproducing user data recorded on a recording medium, wherein an initial value of a random number sequence is determined from a sector number of a second sector in which user data to be reproduced is recorded and the medium unique number. It has an initial value generating means, a random number generating means for generating a random number sequence based on the initial value, and a reproducing means for descrambling user data using the random number sequence.

According to the information reproducing apparatus having this configuration, even if the user data is scrambled by the data scramble key which is different for each information recording medium or even for a single information recording medium or for each sector, it is correctly read. be able to. Further, the information reproducing method of the present invention provides an information reproducing method comprising: a first sector in which a medium unique number is recorded in advance; and a plurality of second sectors in which a unique sector number is added and scrambled user data is recorded. An information reproducing method for reproducing user data recorded on a recording medium, wherein an initial value of a random number sequence is determined from a sector number of a second sector in which user data to be reproduced is recorded and the medium unique number. It has an initial value generation step, a random number generation step of generating a random number sequence based on the initial value, and a reproduction step of descrambling user data using the random number sequence.

According to such an information reproducing method, even if the user data is scrambled with a different data scramble key for each individual information recording medium or even within a single information recording medium or for each sector, it is correctly read. be able to. Also, there is provided a medium number recording apparatus for recording a medium unique number on an information recording medium having a first sector for recording a medium unique number, wherein the sector number added to the first sector and a predetermined fixed data An initial value generating means for determining an initial value of a random number sequence from; a random number generating means for generating a random number sequence based on the initial value; a scramble processing unit for scrambling a medium unique number using the random number sequence; According to a medium number recording apparatus having a structure in which the scramble means has a data recording means for recording a scrambled medium unique number in the first sector, the scramble means is used for generating a data scramble key in an information recording medium. Since the media unique number can be recorded in a scrambled form, the user data recorded / reproduced on the information recording medium can be recorded. It can be implemented strict security for.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance and usage of an information recording medium and an information recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a data structure of an information recording medium in the embodiment.

FIG. 3 is a block diagram showing a configuration of a data recording unit according to the embodiment.

FIG. 4 is a diagram schematically showing a configuration provided by a reference data generation unit in the embodiment for obtaining an exclusive OR of a sector number and a medium unique number;

FIG. 5 is a diagram showing an initial value table in the embodiment.

FIG. 6 is a diagram showing an outline of an arithmetic processing unit provided for the random number generation unit in the embodiment to generate a random number.

FIG. 7 is a diagram showing an arithmetic unit provided for the scramble processing in the scramble processing unit according to the embodiment.

FIG. 8 is a block diagram showing a configuration of a medium number recording unit in the embodiment.

FIG. 9 is a block diagram showing a configuration of a medium number reproducing unit in the embodiment.

FIG. 10 is a block diagram showing a configuration of a data reproducing unit according to the embodiment.

FIG. 11 is a block diagram illustrating a configuration of a data recording unit according to a second embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a data reproducing unit according to the embodiment.

FIG. 13 is a diagram showing a data reproducing unit of an information recording / reproducing apparatus in which only reproduction of two kinds of data of an image and a sound is permitted in a modification of the first and second embodiments of the present invention. .

[Explanation of symbols]

Reference Signs List 10 information recording medium 100 sector 101 sector header area 102 data area 110 lead-in area 120 lead-out area 20 information recording / reproducing device 21, 60 data recording section 211, 221, 600, 700, 800 See initial value decision section 215, 225 Data generation unit 216, 226, 601, 602, 603 Initial value table 217, 227, 604, 704 Search unit 22 Medium number recording unit 23 Medium number reproduction unit 24, 70, 80 Data reproduction unit 30 PC

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruyuki Takizawa 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D044 BC03 CC04 DE03 DE12 DE49 DE50 EF05 FG18 GK17

Claims (18)

[Claims] 1. An information recording medium, wherein a sector number is added, and a first sector in which a medium unique number unique to the information recording medium is recorded, and different sector numbers are respectively added, and user data is recorded. User data recorded in the second sector is generated based on the sector number of the second sector in which the user data is recorded and the medium unique number. An information recording medium, which is scrambled by a data scramble key to be used. 2. The data scramble key is a random number sequence whose initial value is a value generated based on the sector number of the second sector and the medium unique number, and the user data is a byte unit. 2. The information recording medium according to claim 1, wherein the random number sequence and the plaintext data are scrambled so that predetermined arithmetic processing is performed. 3. A medium number scrambled by a medium number scramble key generated based on a sector number unique to a first sector and predetermined fixed data. Item 3. An information recording medium according to Item 2. 4. The information recording medium according to claim 3, wherein user data is recorded in the first sector together with the medium unique number. 5. The information recording medium according to claim 4, wherein the fixed data is recorded in a lead-in area of the information recording medium. 6. A user data is scrambled on an information recording medium having a first sector on which a medium unique number is recorded in advance and a plurality of second sectors on which user data is recorded with a unique sector number added. An information recording apparatus for recording the above, comprising: an initial value generating means for generating an initial value of a random number series based on a sector number of a sector in which user data is to be recorded and the medium unique number; Random number generating means for generating a random number sequence, scramble means for scrambling user data using the random number sequence, data recording means for recording the scrambled user data in the data area of the sector, An information recording device, comprising: 7. A sector number is added to the first sector, and the medium unique number is scrambled by a scramble key generated based on the sector number added to the first sector and fixed data. The information recording apparatus further comprises: a medium number for descrambling the medium unique number using a descrambling key generated based on a sector number of the first sector and predetermined fixed data. 7. The apparatus according to claim 6, further comprising a reproducing unit, wherein the initial value generating unit generates an initial value of a random number sequence using a medium unique number descrambled by the medium number reproducing unit. 8. Information recording device. 8. The reference data generating means for generating reference data from a sector number of a second sector in which user data is to be recorded and the medium unique number, and a reference data value and a random number sequence. An initial value table having a plurality of combinations with initial values; a search unit for searching the initial value table using the reference data generated by the reference data generating unit as a key to obtain an initial value; 8. The information recording apparatus according to claim 7, wherein a random number sequence is generated based on the initial value obtained by said search means. 9. Type information indicating a data type is added to the user data. The initial value generating means has a plurality of types of initial value tables corresponding to the contents of the type information. Further comprising table selection means for selecting one of the plurality of initial value tables according to the contents of the above, wherein the search means obtains an initial value by searching the initial value table selected by the table selection means. The information recording device according to claim 8, wherein 10. An information recording medium having a first sector in which a medium unique number is recorded in advance, and a plurality of second sectors in which a unique sector number is added and user data is recorded,
What is claimed is: 1. An information recording method for recording user data after scramble processing, comprising: generating an initial value of a random number sequence based on a sector number of a second sector in which user data is to be recorded and the medium unique number. A random number generation step of generating a random number sequence based on the initial value; a scrambling step of scrambling user data using the random number sequence; and a second sector for the user data scrambled in the scramble step. And a data recording step of recording the data in the data area. 11. A sector number is added to the first sector, and the medium unique number is scrambled by a scramble key generated based on the sector number added to the first sector and fixed data. The information recording method further comprises: a medium number reproduction method for descrambling the medium unique number using a scramble key generated based on a sector number of the first sector and predetermined fixed data. 11. The method according to claim 10, further comprising the step of: generating an initial value of a random number sequence using the medium unique number descrambled in the medium number reproducing step in the initial value generating step. Information recording method. 12. The reference value generating step of generating reference data from a sector number of a second sector in which user data is to be recorded and the medium unique number, and a reference data value and a random number sequence. A search step of searching for an initial value table having a plurality of combinations with initial values by using the reference data generated by the reference data generating means as a key to obtain an initial value; and in the random number generating step, That a random number sequence is generated based on the initial value obtained in
The information recording method according to claim 11, wherein: 13. Type information indicating a data type is added to the user data, and the initial value generating step is performed according to the content of the type information from a plurality of types of initial value tables corresponding to the content of the type information. 13. The apparatus according to claim 12, further comprising: a table selecting step of selecting one of the initial value tables by using the initial value table selected in the table selecting step.
Information recording method described in. 14. An information recording medium recorded on an information recording medium having a first sector in which a medium unique number is recorded in advance, and a plurality of second sectors in which user data to which a unique sector number is added and scrambled are recorded. An information reproducing apparatus for reproducing user data, wherein an initial value generating means for determining an initial value of a random number sequence from a sector number of a second sector in which user data to be reproduced is recorded and the medium unique number; An information reproducing apparatus, comprising: random number generating means for generating a random number sequence based on the initial value; and reproducing means for descrambling user data using the random number sequence. 15. The first sector is provided with a sector number, and the medium unique number is scrambled by a scramble key generated based on the sector number added to the first sector and fixed data. The information reproducing apparatus further comprises: a medium number reproducing means for descrambling the medium unique number using a descramble key generated based on a sector number of the first sector and predetermined fixed data. 15. The information reproducing apparatus according to claim 14, wherein the initial value generating unit generates an initial value of a random number sequence using a medium unique number descrambled by the medium number reproducing unit. . 16. An information recording medium recorded on an information recording medium having a first sector in which a medium unique number is recorded in advance, and a plurality of second sectors in which user data to which a unique sector number is added and scrambled is recorded. An information reproducing method for reproducing user data being read, wherein an initial value generating step of determining an initial value of a random number sequence from a sector number of a second sector in which user data to be reproduced is recorded and the medium unique number; An information reproducing method, comprising: a random number generating step of generating a random number sequence based on the initial value; and a reproducing step of descrambling user data using the random number sequence. 17. The first sector has a sector number added thereto, and the medium unique number is scrambled by a scramble key generated based on the sector number added to the first sector and fixed data. The information reproducing step further includes a medium number reproducing step of descrambling the medium unique number using a descramble key generated based on a sector number of the first sector and predetermined fixed data. 17. The information according to claim 16, wherein, in the initial value generating step, an initial value of a random number sequence is generated using a medium unique number descrambled in the medium number reproducing step. Playback method. 18. A medium number recording device for recording a medium unique number on an information recording medium having a first sector for recording a medium unique number, wherein the medium number recording device is configured to determine a sector number added to the first sector in advance. Initial value generating means for determining an initial value of a random number sequence from the fixed data, random number generating means for generating a random number sequence based on the initial value, and scrambling processing for scrambling a medium unique number using the random number sequence. And a data recording means for recording, in the first sector, a medium unique number scrambled by the scrambling means, a medium number recording apparatus.