JPH086837A - Information reader - Google Patents

Abstract

PURPOSE:To improve the usability of a read-only recording medium by controlling a read of information from the read-only recording medium based on the recorded management information. CONSTITUTION:This reader is equipped with a drive device 2 which reads information out of the read-only recording medium CD-ROM 1, a magnetic disk 90 as a specific management information recording medium, an external storage device 3 which copies the management information, an input device 7 which alters the recorded management information, and a CPU 4 which controls a read of the information from the CD-ROM 1 based on the recorded management information. Then the management information recorded on the CD-ROM 1 is copied to the magnetic disk 9 and based on this management information, the read of information from the CD-ROM 1 by the drive device 2 is controlled. The recording information recorded on the magnetic disk 9 can be modified. Therefore, the usability of the CD-ROM 1 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc (for example, a CD-ROM) in which information is recorded in advance.
Etc.) for reading information from a read-only recording medium.

[0002]

2. Description of the Related Art Conventionally, as a read-only recording medium in which data (information) is recorded in advance and rewriting (deletion, addition, change of information) is impossible, for example, a CD-R is used.
OM and the like are known. The recording format of data in the CD-ROM is ISO (International
For example, the ISO9660 format set by Organization for Standardizaiton) is used.

In the ISO9660 format, in order to cover the seek delay at the time of access, a CD-ROM is used.
In addition, a so-called path table for managing the data stored therein is recorded, and the data is accessed by referring to the path table.

FIG. 6 is a C of the ISO9660 format.
An example of a D-ROM is shown. The path table is a CD
-ROM, for example, recorded on the inner circumference side, where there is a CD
-File names of data recorded in the ROM, directory names to which each file belongs (indicated in the path column in Fig. 6), and whether or not the files and directories can be viewed (read Information indicating whether to permit display (hereinafter referred to as displayable / impossible information as appropriate) and whether the file is executable (whether reading and executing is permitted) Access permission information including information (hereinafter, appropriately referred to as executable / non-executable information), etc., and information on the position where a file or the like is actually recorded (hereinafter, appropriately referred to as recording position information)
The position of a block in which is recorded (for example, a logical block number) is described.

In FIG. 6 (also in FIGS. 3 and 4 which will be described later), the description of the path string is only a slash (/) and ones ending with a slash are directory names, and others. Is the file name.

The reading of data from such a CD-ROM is performed as follows, for example. That is, first, the CD-ROM is mounted on, for example, a computer having a CD-ROM drive. Then, when the user operates the computer to read the file / bin / awk, for example, the OS (Operat) of the computer
ing System), the file name / bin / awk is searched in the path table.

Then, the CD-RO is read so as to read the logical block number corresponding to the file name / bin / awk.
The M drive is instructed, and the block with the logical block number 80 (data recorded in the block) is sent to the OS. The OS analyzes the access permission information recorded in the block and outputs the file / bin
If / awk has access permission (displayable or executable) (usually all have access permission), seek to the block in which the file / bin / awk is recorded and read the data. , CD-RO
Instruct M drive. As a result, the file / bin / awk is read from the CD-ROM.

[0008]

By the way, the CD-RO
As described above, M is not able to rewrite the recorded contents, and basically all files and directories recorded therein are accessible (readable and visible, and Executable files are designed to be read and executable).

Therefore, the user cannot hide (even apparently not recorded in the CD-ROM) a file or a directory which he / she has accessed and decided not to use. Therefore, by mistake,
I sometimes accessed the unnecessary files and directories again.

Further, when searching for a file or directory recorded on a CD-ROM, the unnecessary files and directories as described above are targeted for the search along with the other files, so that it takes time to search. was there.

If the computer having the CD-ROM drive is compatible with the format of the CD-ROM, it is possible to access all the files and directories recorded in the CD-ROM. Therefore, for example, it is difficult to allow only a specific user to access a certain file or directory.

Therefore, in order to ensure the security of the files and directories recorded on the CD-ROM,
For example, it is necessary to scramble the data or record the data in a specific format, which is troublesome.

As described above, the conventional CD-RO, for example,
A read-only recording medium such as M has a problem of poor usability.

The present invention has been made in view of the above circumstances, and improves the usability of a read-only recording medium.

[0015]

An information reading apparatus of the present invention is a read-only recording medium (for example, a CD-ROM 1 shown in FIG. 1) in which information and management information for managing the information are recorded. Information reading device for reading information from a read-only recording medium (for example, the drive device 2 shown in FIG. 1) and a management information recording medium (predetermined recording medium). For example, a copy means (for example, the external recording device 3 shown in FIG. 1) for copying the management information onto the magnetic disk 9 shown in FIG. 1 and a changing means for changing the management information recorded on the management information recording medium. (For example, in FIG.
1) and the management information recorded on the management information recording medium, and control means for controlling the reading of information from the read-only recording medium by the reading means (for example, the CPU 4 shown in FIG. 1). ) And are provided.

In this information reading device, the read-only recording medium is made detachable from the reading means, and when the read-only recording medium is attached to the reading means, the management information recorded therein. Is determined on the management information recording medium (for example, the processing step S of the program shown in FIG. 2).
3) or the like), the management information can be copied to the management information recording medium when the judgment means determines that the management information is not recorded in the management information recording medium. . The changing unit can change the management information so that the information becomes invisible.

When the management information includes access permission information indicating whether or not to permit access to the information, the changing means can change the access permission information. Further, the change of the access permission information by the changing unit can be permitted when a predetermined input is made. Furthermore, the read-only recording medium can be an optical disc, and the management information recording medium can be a magnetic disc.

[0018]

In the information reading apparatus having the above structure, the management information recorded in the CD-ROM 1 is copied onto the magnetic disk 9, and the drive apparatus 2 reads the information from the CD-ROM 1 based on this management information. Is controlled. The management information recorded on the magnetic disk 9 can be changed. Therefore, CD-R
The usability of the OM1 can be improved.

[0019]

1 is a block diagram showing the configuration of an embodiment of a CD-ROM reproducing apparatus (file system) to which the present invention is applied. The CD-ROM 1 is, for example, ISO966.
As shown in FIG. 6, in the 0 format, along with data (information) (files and directories), management information for managing the data, that is, file name, directory name, and access permission A path table in which information (displayable / unavailable information and executable / unavailable information) and the position of a block in which recording position information is recorded (for example, logical block number) is recorded in advance. .

The CD-ROM 1 is removable from the drive device 2. The drive device 2 has a CD-
When the ROM1 is installed, the CD-
The ROM1 is accessed and data is read from the ROM1. If the data read from the CD-ROM 1 is a displayable file, it is supplied to the display device 8 and displayed. If the data is an executable file, it is executed by the CPU 4. Further, when the directory is accessed, the file names of the files belonging to the directory are read from the CD-ROM 1 and supplied to the display device 8 for display. When the path table is read from the CD-ROM 1, it is supplied to the external recording device 3 and recorded on the magnetic disk (hard disk) 9.

The external recording device 3 is composed of, for example, a hard disk device or the like, and records the path table read from the CD-ROM 1 on the magnetic disk 9. That is, the external recording device 3 is adapted to copy the path table of the CD-ROM 1 onto the magnetic disk 9.

The external recording device 3 includes a magnetic disk 9
Is read out and supplied to the CPU 4.

The path table is recorded on the magnetic disk 9 as described above.
(Operating System) and application programs are recorded.

The ROM 6 starts the OS (CPU
IPL (Initial Pr) for booting OS)
ogram Loader) program etc. are stored. RA
The M5 stores data and programs (OS and application programs) necessary for the operation of the CPU 4.

When the power of the apparatus is turned on, the CPU 4 executes the IPL program stored in the ROM 6 to execute the OS recorded on the magnetic disk 9.
Is read out via the external recording device 3 and stored in the RAM 5. And CPU4 is OS
After storing in the RAM 5, according to the operation of the input device 7, the application program (for example,
The data read from the CD-ROM 1 or the magnetic disk 9) is loaded into the RAM 5 and executed, and other processing (for example, control of the drive device 2, the external recording device 3, and the display device 8) is performed. It is done like this.

The input device 7 is, for example, a keyboard or a mouse, and is operated when a command for causing the CPU 4 to perform a predetermined process or necessary data is input. The display device 8 is adapted to display, for example, data read from the CD-ROM 1 and other information.

Next, the operation will be described. When the CD-ROM 1 is mounted (mounted) on the drive device 2, the CPU 4 performs processing according to the flowchart of FIG. That is, first, in step S1, the drive device 2 is controlled so that the path table recorded in the CD-ROM 1 is read. Then, the process proceeds to step S2, the external recording device 3 is controlled, and the path table (file of the path table) recorded on the magnetic disk 9 by this (in step S4 described later, recording (copying) on the magnetic disk 9 in the past. )) Is read (when the path table is not recorded on the magnetic disk 9, step S3 is skipped and the process proceeds to step S4).

The CPU 4 searches the path table read from the magnetic disk 9 for the same path table read from the CD-ROM 1.

Then, in step S3, the CD-ROM in the path table read from the magnetic disk 9 is read.
It is determined whether or not there is the same one as the path table read from 1. In step S3, the CD-ROM 1 is stored in the path table read from the magnetic disk 9.
If it is determined that there is no same path table (existing) as the path table read from the CD-ROM 1, the path table read from the magnetic disk 9 is not searched. , Ie CD
-If the ROM 1 has never been mounted in the drive device 2, the process proceeds to step S4, where the path table of the CD-ROM 1 is the external recording device 3
To be recorded on the magnetic disk 9.
That is, in this case, the path table of the CD-ROM 1 is copied to the magnetic disk 9.

Then, in step S5, the path table of the CD-ROM 1 copied to the magnetic disk 9 is
A unique file name is assigned and the process ends. The file name given to the path table is CD-R.
RAM until OM1 is removed from drive device 2
Stored in 5.

On the other hand, in step S3, the CD-ROM is stored in the path table read from the magnetic disk 9.
When it is determined that the same path table as the first path table exists (exists) (when the same path table read from the CD-ROM 1 is searched from the path tables read from the magnetic disk 9). , Ie CD-RO
If M1 has been installed in the drive device 2 so far and the path table is already recorded on the magnetic disk 9 in step S4 described above, the process proceeds to step S6, and the file name is changed. , Is read from the magnetic disk 9 via the external recording device 3, and the process is ended. The file name of the path table read from the magnetic disk 9 is stored in the RAM 5 until the CD-ROM 1 is removed from the drive device 2.

As described above, when the CD-ROM 1 is mounted on the drive device 2, it is judged whether or not the path table recorded therein is recorded on the magnetic disk 9, and the path table is When not recorded on the magnetic disk 9, the path table is copied to the magnetic disk 9 in the external recording device 3.

The path table recorded in the CD-ROM 1 is not judged whether it is recorded in the magnetic disk 9 or not, and when the CD-ROM 1 is mounted in the drive device 2, the path is always recorded. Magnetic disk 9 on the table
It is also possible to copy to (in this case,
If the path table of the CD-ROM 1 is already recorded on the magnetic disk 9, it is overwritten).

Thereafter, the CPU 4 reads the data from the CD-ROM 1 by the drive device 2 based on the path table of the file name stored (saved) in the RAM 5 which is the path table recorded in the magnetic disk 9. Is controlled.

That is, when the path table recorded on the magnetic disk 9 is as shown in FIG. 3 (a), for example, the user selects, for example, file / bin / aw.
When the input device 7 is operated so as to read and display k, the CPU 4 searches the path table recorded on the magnetic disk 9 for the file name / bin / awk.

Then, the drive unit 2 is instructed to read the logical block number corresponding to the file name / bin / awk, and the block of the logical block number 80 (data recorded in the block) is thereby changed.
It is sent from the drive device 2 to the CPU 2. CPU4
The access permission information recorded in the block is analyzed, and if the file / bin / awk has access permission (displayable) (usually all have access permission), the file / bin / awk The drive device 2 is controlled so as to seek the recorded block and read the data. As a result, the file / bin / awk is read from the CD-ROM 1 and supplied to the display device 8 for display.

For example, immediately after the CD-ROM 1 is mounted in the drive device 2 for the first time, the CD-R is recorded on the magnetic disk 9 by the process of step S4 in FIG.
The same path table as the path table of the OM1 is recorded, and as described above, the access permission information for files and directories obtained by referring to the path table of the CD-ROM 1 is normally all access permission. Therefore, the user can use the CD-ROM
Any data recorded in 1 can be accessed.

Next, in this apparatus, the user, for example, once accesses the CD-ROM
The files and directories recorded in No. 1 can be hidden (apparently not recorded in CD-ROM 1).

That is, for example, now, file / bin / a
wk is no longer necessary, and the input device 7 is a file / bin
When it is operated to delete / awk (when the deletion command is input by operating the input device 7),
In the CPU 4, from the path table (FIG. 3A) recorded on the magnetic disk 9, the file name / bin /
awk is searched.

Then, the file name / bin / awk
The entry (/ bin / awk 80) corresponding to is deleted from the path table, whereby the path table shown in FIG. 3A is changed to that shown in FIG. 3B. Then, the deleted entry is recorded in a predetermined recording area of the magnetic disk 9 (hereinafter referred to as deleted path table area), as shown in FIG.

As described above, the CPU 4 controls the reading of the data from the CD-ROM 1 by the drive device 2 based on the path table recorded on the magnetic disk 9, so that the path table controls the input device 7. After being changed as shown in FIG. 3 (b) by the operation, that is, after the file / bin / awk is changed so as to be invisible to the user, this file is changed. Although / bin / awk is recorded on the CD-ROM 1, it cannot be accessed.

Therefore, in this case, it is possible to prevent the user from accidentally accessing unnecessary files and directories again.

Further, in this case, since the path table recorded on the magnetic disk 9 has no unnecessary (deleted) file or directory entry, the search time for other files or directories should be shortened. It is possible (search efficiency can be improved).

Further, the C mounted on the drive unit 2
When the D-ROM 1 is removed and then mounted again, the path table already recorded on the magnetic disk 9 is used as described with reference to FIG. In addition, it is not necessary to delete unnecessary files and directories as described above.

Incidentally, after the path table recorded on the magnetic disk 9 is set as shown in FIG.
CD-ROM 1 having the path table shown in (a)
However, when it is reattached to the drive 2, as shown in FIG.
In step S3, it is determined whether or not the path table recorded on the magnetic disk 9 is the same as the path table read from the CD-ROM 1. In this determination process, as shown in FIG. In the path table of (b), the one that is restored from the entry recorded in the deleted path table area shown in FIG.
The path table read from the D-ROM 1 is compared.

When the input device 7 is operated to delete a directory, the entry of the directory and all the entries of the files belonging to the directory (including the subordinate directories) are stored in the path table. Deleted from. That is, for example, the path table recorded on the magnetic disk 9 is shown in FIG.
When the input device 7 is operated to delete the directory / bin / in the case as shown in FIG. 5, the files / bin / awk and / bi belonging to the directory are added in addition to the entry of the directory / bin /.
The n / cat entry is also deleted.

By the way, it is conceivable that the files and directories invisible as described above will be required later. Therefore, in this device, the entry deleted from the path table recorded on the magnetic disk 9 can be restored.

That is, when the input device 7 is operated to restore the entry deleted from the path table, CP
U4 reads the entry (FIG. 3C) recorded in the deleted path table area of the magnetic disk 9 and supplies it to the display device 8 for display. Then, when the user operates the input device 7 to select one of the entries displayed on the display device 8 which is desired to be restored, the entry is
The path table recorded on the magnetic disk 9 (see FIG.
It is written in the original position of (b)). As a result, the file or directory corresponding to the entry can be accessed.

Next, in the path table of the CD-ROM 1,
For example, as shown in FIG. 4, access permission information (displayable /
In the case where the impossibility information and the executability information are described together with the file name, the directory name, and the logical block number (in this case, the access permission information is not recorded in the block corresponding to the logical block number). As described above, it is possible to control the access to the data recorded in the CD-ROM 1 by changing the access permission information instead of deleting the entry in the path table.

In FIG. 4, r in the column of access permission information (permission information) is display enable / disable information, which indicates that the file of the entry can be read and displayed (accessible). . Further, x is executability information, which indicates that the file of that entry can be read and executed (accessible). When the access permission information of the entry of the directory is r (r-), only the name of the file or directory (not the content of the file or directory) belonging to the directory is allowed to be seen. Also,
When the access permission information of the directory is x (-x), only the entry into the directory is permitted (files and directories belonging to the directory cannot be viewed or executed). Further, when the access permission information of the directory is rx, it is permitted to access the files and directories belonging to the directory (view and execute the files and directories).

As described above, when the access permission information is described in the path table, the above-mentioned ISO96 is used.
Compared to the case of the 60 format, it is not necessary to seek to another block to obtain the access permission information, and therefore, faster access is possible.

When the CD-ROM 1 having the path table as shown in FIG. 4 is mounted in the drive device 2,
As described with reference to FIG. 2, whether or not the same one as the path table (as described above, if there is a deleted entry, it is restored) is recorded on the magnetic disk 9. If it is determined that the path table is not recorded on the magnetic disk 9, the path table is copied to the magnetic disk 9 in the external recording device 3, and the CPU 4
Controls the drive device 2 based on the copied path table. When the same path table as the CD-ROM 1 is recorded on the magnetic disk 9, the CPU 4 controls the drive device 2 based on the recorded path table.

That is, when the path table recorded on the magnetic disk 9 is as shown in FIG. 4A, for example, the user reads and displays the file / bin / cat, for example. When the input device 7 is operated, C
The PU4 searches the path table recorded on the magnetic disk 9 for the file name / bin / cat.

Then, the access permission information of the file / bin / cat is referred to. The permission information is
rx, and therefore access to the file / bin / cat is permitted, the CPU 4 instructs the drive device 2 to read the logical block number corresponding to the file name / bin / cat. As a result, the block with the logical block number 90 (data recorded in the block) is transferred from the drive device 2 to the CP.
Sent to U4. The CPU 4 refers to the recording position information recorded in the block and outputs the file / bin / ca
The drive device 2 is controlled so as to seek the block in which t is recorded and read the data. This allows
The file / bin / cat is read from the CD-ROM 1 and displayed on the display device 8.

Also, the user may select, for example, file / bin
When the input device 7 is operated to read and display / awk, the CPU 4 causes the CPU 4 to select the file name / bin / awk from the path table recorded on the magnetic disk 9.
Will be searched.

Then, the access permission information of the file / bin / awk is referred to. The permission information is
--- Therefore, access to the file / bin / awk is not permitted (reading, displaying, and executing are prohibited).
U4 causes the display device 8 to display, for example, a message indicating that display (access) is impossible, thereby notifying the user that the display of the file / bin / awk is not permitted.

In addition, the user selects file / bin / aw
When the input device 7 is operated to read and execute k, the file / bin / awk is disabled as described above, so the CPU 4 displays, for example, a message indicating execution disabled (access disabled). It is displayed on the device 8 so that the file / bin / awk can be displayed to the user.
Signal that execution is not allowed.

Next, the user selects, for example, file / bin.
When it is desired to execute / awk, the input device 7 is operated to allow execution of the file / bin / awk (change the access permission information of the file / bin / awk to x (-x)). To be done. Then, the CPU 4 searches the path table recorded on the magnetic disk 9 for the file name / bin / awk.

Then, the file name shown in FIG.
The entry corresponding to bin / awk (/ bin / awk
The access permission information (---) of 80 --- is shown in FIG.
It is changed to the access permission information (-x) shown in (b).

As described above, the CPU 4 controls the reading of data from the CD-ROM 1 by the drive device 2 based on the path table recorded on the magnetic disk 9, so that the path table is set to the input device 7. By the operation, after the file is changed as shown in FIG. 4B, the file / bin / awk can be executed in the same manner as the case of the file / bin / cat described above.

In addition, the user selects the file / bin / a
When the display of wk is desired, the input device 7 is operated so as to permit the display of the file / bin / awk, so that the file / bin / awk shown in FIG.
The permission information (---) is changed to r-, which allows the file / bin / awk to be viewed. Also,
By changing the access permission information of the file / bin / awk to rx, it becomes possible to view and execute the file / bin / awk.

On the other hand, if the user uses, for example, file / bin
When you no longer want access to / cat,
The input device 7 is operated so as to deny access to the file / bin / cat. Then, CPU4
At, the file name / bin / cat is searched from the path table recorded on the magnetic disk 9.

Then, the file name shown in FIG.
The entry corresponding to bin / cat (/ bin / cat
The permission information (rx) of 90 rx) is changed to-, so that the file / bin / cat becomes CD-.
Although it is recorded in the ROM 1, it cannot be accessed.

Therefore, also in this case, the user mistakenly
It is possible to prevent access to unnecessary files and directories again.

By changing the access permission information of the file / bin / cat to -x or r-, the display or execution can be disabled.

Next, as described above, the provider (manufacturer) of the CD-ROM 1 may want to allow only a specific user to access a certain file or directory recorded therein. That is, CD-ROM1
For example, information (files) A, B, C, D is recorded, and a person who purchases the CD-ROM 1 at a predetermined price P1 is allowed to access the information A to C, for example.
There may be a case where a person who purchases at a price P2 higher than that is allowed to access the information D in addition to the information A to C.

Therefore, in the apparatus shown in FIG. 1, the access permission information that allows access to the information A to C and disables access to the information D is recorded in the path table of the CD-ROM 1, As described above, access to the information D can be permitted only to a specific user (who purchased the CD-ROM 1 at the price P2).

That is, when the input device 7 is operated to change the path table recorded on the magnetic disk 9 corresponding to the CD-ROM 1 after the CD-ROM 1 is mounted on the drive device 2, In the CPU 4, as shown in the flowchart of FIG. 5, first, in step S11, the access permission information (hereinafter, appropriately referred to as initial access permission information) described in the path table of the CD-ROM 1 is read (acquired). Input) to the CPU 4. Then, when the user operates the input device 7 so as to change the access permission information of the file or directory recorded in the CD-ROM 1, the step S1 is performed.
2, the operation signal corresponding to the operation is the CPU 4
Is input to step S13, and it is determined whether or not the change of the access permission information by operating the input device 7 is the addition of the attribute to the initial access permission information.

Here, adding an attribute to the initial access permission information means changing the initial access information to accessible when the initial access information is inaccessible (for example, the initial access permission information is --- In some cases, changing it to r-, -x, rx, etc.).

In step S13, when it is determined that the change of the access permission information is not the addition of the attribute to the initial access permission information, that is, the change of the access permission information, the access is permitted (r, x) is not accessible (-). If the initial access information is set to be accessible (r, x), it is made inaccessible (-) in the past and is returned to accessible (r). Then, the process proceeds to step S17, the access permission information of the path table recorded on the magnetic disk 9 is changed in response to the operation of the input device 7, and the process ends.

On the other hand, if it is determined in step S13 that the change of the access permission information is the addition of the attribute to the initial access permission information, the process proceeds to step S14, and the user authentication process is performed.

That is, as described above, the CD is available at the high price P2.
-A person who has purchased the ROM 1 is given a password, for example, at the time of purchase (for example, a retailer can give the password). Further, the same password as the password is recorded in advance on the CD-ROM 1, for example. In step S14, when the password is input, for example, by operating the input device 7, the CPU 4 reads the password recorded in the CD-ROM 1.

Then, in step S15, it is determined whether or not the input password matches the password recorded in the CD-ROM 1. Step S15
When it is determined that the input password and the password recorded in the CD-ROM 1 match in step S17, the process proceeds to step S17, and the magnetic disk 9 is recorded on the magnetic disk 9 in response to the operation of the input device 7 as described above. The access permission information of the recorded path table is changed, that is, the initial access information is inaccessible (-),
The access is changed to (r, x), and the process ends.

On the other hand, the entered password and the CD-R
If it is determined that the password does not match the password recorded in the OM1, the process proceeds to step S16, and a message (error message) indicating that the access permission information cannot be changed is displayed on the display device 8 and the process is performed. finish.

Therefore, only a specific user who knows the password can change the initial access information, which is inaccessible (-), to accessible (r, x). Only the user can be permitted to access a predetermined file or directory.

Specifically, when the description content of the path table recorded in the CD-ROM 1 is as shown in FIG. 4A, for example, only a specific user who knows the password can access it. , The path table recorded on the magnetic disk 9 can be changed as shown in FIG. 4B, whereby the file / bin / awk can be accessed.

Therefore, without scrambling the data recorded in the CD-ROM 1 or recording the data in a specific format therein, the CD-R
Security of files and directories recorded in the OM1 can be ensured.

In the above case, the input device 7
Although the password is input by operating the, the person who purchased the CD-ROM 1 at a high price P2 can purchase a recording medium (for example, an optical card or the like) on which the password is recorded at the time of purchase. ) Can also be given. In this case, the device of FIG. 1 may be provided with an optical card reader so that the password recorded on the optical card can be read.

In the above case, the CD having the path table including the access permission information as shown in FIG.
A CD-R having a path table which does not include the access permission information shown in FIG.
OM1 (for example, ISO9660 format)
Can be targeted. However, in this case, CD-R
It is necessary to read not only the path table of the OM1 (FIG. 3) but also the access permission information recorded in the block corresponding to the logical block number described therein and record it on the magnetic disk 9 together with the path table. is there.

Further, in the above case, only the access permission information of the path table recorded on the magnetic disk 9 is changed. However, when the access permission information is made inaccessible, for example, FIG. As described above, it is possible to delete the entry from the path table and record it in a predetermined recording area of the magnetic disk 9.

In the above case, the user authentication (determination as to whether the user is a specific user) is performed only when the access permission information is changed by adding an attribute to the initial access permission information. However, in addition to this, it is possible to always authenticate the user when the access permission information is changed, for example.

As described above, the information reading device of the present invention can be used as a CD.
The case where the present invention is applied to a CD-ROM reproducing device that reproduces data from a ROM has been described, but the present invention can be applied to a device that reads information from another read-only recording medium (for example, an optical disc).

In this embodiment, the magnetic disk 9 is used as the recording medium for copying the path table, but the recording medium may be a rewritable recording medium such as a magneto-optical disc or a RAM in addition to the magnetic disc. A medium (storage medium) can be used.

[0084]

As described above, according to the present invention, the usability of a read-only recording medium can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a CD-ROM reproducing device to which the present invention is applied.

FIG. 2 is a flowchart illustrating an operation when the CD-ROM 1 is mounted in the drive device 2 in the embodiment of FIG.

FIG. 3 is a CD-ROM 1 recorded on a magnetic disk 9.
FIG. 6 is a diagram for explaining a change of the path table of FIG.

FIG. 4 is a diagram showing a path table including permission information.

5 is a flowchart illustrating an operation when a path table including permission information is changed in the embodiment of FIG.

FIG. 6 is a diagram showing a format of a CD-ROM.

[Explanation of symbols]

 1 CD-ROM 2 drive device 3 external recording device 4 CPU 5 RAM 6 ROM 7 input device 8 display device

Claims (6)

[Claims] 1. An information reading device for reading the information from a read-only recording medium in which management information for managing the information is recorded together with the information, the information being read from the read-only recording medium. Reading means for reading the management information, copy means for copying the management information to a management information recording medium which is a predetermined recording medium, changing means for changing the management information recorded on the management information recording medium, and the management information An information reading apparatus comprising: a control unit that controls the reading of the information from the read-only recording medium by the reading unit based on the management information recorded in the recording medium. 2. The read-only recording medium is detachably attached to the read-out means, and the management information recorded therein when the read-only recording medium is attached to the read-out means. Is further provided with a determining means for determining whether or not the management information is recorded in the management information recording medium, and the copying means determines, by the determining means, that the management information is not recorded in the management information recording medium. The information reading device according to claim 1, wherein the management information is copied to the management information recording medium when the information is read. 3. The information reading device according to claim 1, wherein the changing unit changes the management information so that the information becomes invisible. 4. The management information includes access permission information, which is information indicating whether or not to permit access to the information, and the changing unit changes the access permission information. 1. The information reading device described in 1 or 2. 5. The information reading apparatus according to claim 4, wherein the change of the access permission information by the changing unit is permitted when a predetermined input is made. 6. The information reading device according to claim 1, wherein the read-only recording medium is an optical disc, and the management information recording medium is a magnetic disc.