JP2002237130A - Copying protection method of optical information recording medium and optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent illicit copying without using a special table or the like relating optical information recording medium having a reproduction-only region reproducible with a CD-ROM or the like. SOLUTION: The data of software or the like is recoded by each of packets (fixed packets) of a specific size to the optical information recording medium and whether the reproduced data is copied or not is inspected. If the data is copied, the reading of the data is prohibited. Whether the data is copied or not is discriminated by, as an example, deciding that the data is copied if there is a link. Unlike an ordinary CD-ROM, the information is recorded by each of the packets and therefore the copying with a general CD-R/RW writer is made difficult and for of the copied optical information recording medium, the reading of the data is prohibited, by which illicit copying is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium copy protection method and an optical information recording medium, and more particularly, to a method of determining a copied optical information recording medium and a copy protection of the optical information recording medium. Regarding data structure.

[0002]

2. Description of the Related Art As an optical information recording medium for recording information,
CDs, CD-ROMs and the like are widely used. They are,
The pit row formed on the master by the master exposure apparatus is transferred to a stamper (called mastering), and the stamper is transferred to a molding substrate using the stamper as a mold. Has a data structure in which digital data is recorded together with time information (header address: physical address), and reproduces data based on the time information recorded in the pits. In a CD-ROM or the like, in addition to the header address, L
A logical address called a BN (Logical block number) is also recorded, and data is reproduced mainly based on the LBN. These CDs and CD-ROMs are read-only optical information recording media, and are produced in large quantities at factories.

On the other hand, writable optical information recording media include CD-R (CD-Recordable) and CD-R.
W (CD-Rewritable) is widely used. In these media, a groove on which time information is recorded is formed on the entire surface, and a recording film (a dye or the like for CD-R, a phase change film for CD-RW), A structure in which a reflective film, a protective film, and the like are formed, and a header address (time information) and data are recorded by writing pits with a CD-R / RW writer so as to match the recorded time information. It has become. In a CD-R or CD-RW after information recording, data is reproduced by a CD player, a CD-ROM player, or the like based on time information recorded in the pits.

[0004] Here, information is recorded on a medium such as a CD-R or a CD-RW in a format according to the application. For example, in the case of a music CD, it is recorded in a CD format, and in the case of storing data,
0 format. When recording additional data in the normal ISO9660 format, Session
It is necessary to record the lead-in and lead-out in units of additional records.
Mbyte or more overhead occurred (see FIG. 5).

Therefore, a random accessible format called UDF (Universal Disk Format) has emerged as a format for recording data. In this format, data is additionally written in packet units of about 64 Kbytes (32 blocks), and a CD-RW or the like recorded in this format can be reproduced by a CD-ROM device or the like as in the ISO9660 format (FIG. 6). reference).

[0006] In such information recording in packet units, at the start of writing at the time of additional writing, overlap due to positional deviation in the track direction (difference between time information engraved in a groove and time information engraved in a pit) occurs. In order to prevent destruction of data due to separation, as shown in FIG. 6, the data is recorded with a link portion at the beginning of writing. CD-R or CD-R
In the case of W, additional writing is performed with the link portion of seven blocks interposed, and the data is read without the link portion during reproduction.

[0007] There are two types of such information recording methods in packet units: a fixed packet recorded for each packet of a fixed size and a variable packet recorded in a different packet size depending on the data size.

In recording in a fixed packet, a link portion is added for each packet, and a logical address is not assigned to the link portion, so that the logical address and the header address are shifted at a fixed rate. In the CD-RW, a link portion of 7 blocks is formed for each 32 blocks (64 Kbytes) of one packet, so that all data to be recorded is divided and recorded for every 32 blocks, and the relationship between the LBN and the header address is shown in FIG. As shown in FIG.

On the other hand, in variable packet recording, a link portion is added for each packet, and a logical address is also assigned to the link portion. In the CD-R, since a link portion of 7 blocks is formed for each packet, it becomes as shown in FIG. 512Kb for CD-R / RW writer
It has a buffer memory of about Byte to 2 Mbytes, and if there is more data than these memory capacities, it is divided and recorded in packets smaller than the buffer memory.

[0010] Some CD-Rs and CD-RWs have a data structure in which prepits are partially formed for reproduction only.
-RW is called a hybrid disc.

[0011]

The information recorded on the read-only (including partially read-only hybrid disc) optical information recording medium as described above is digital information and does not deteriorate even when copied. For this reason, there is a problem that data, application programs, and the like are illegally copied and used.

As a conventional example for preventing unauthorized copying of a read-only optical information recording medium, there is a technique described in Japanese Patent Application Laid-Open No. Hei 7-262001. This is because, when information such as an application program is recorded on an optical information recording medium, the information is recorded together with the logical address in order from the head of the physical address, so that the logical address increases along with the physical address. However, in this conventional example, a part of the logical addresses is replaced and recorded. Then, a table recording the correspondence between the logical address and the physical address is prepared.
By reading the logical address and the physical address and comparing them with the correspondence recorded in the table, it is determined whether or not the recorded information has been copied.

However, the technique described in Japanese Patent Laid-Open No. Hei 7-262001 has a problem that a table that records the correspondence between logical addresses and physical addresses is required.

An object of the present invention is to prevent unauthorized copying of an optical information recording medium having a read-only area that can be played back on a CD-ROM or the like without using a special table or the like.

[0015]

According to the first aspect of the present invention, there is provided a copy protection method for an optical information recording medium, which is a method for preventing data such as software recorded on the optical information recording medium from being copied. Data such as software is recorded on a recording medium for each fixed-size packet (fixed packet), and it is checked whether reproduced data is copied. If the data is copied, data reading is prohibited. A copy protection method for an optical information recording medium, characterized in that:

According to a second aspect of the present invention, there is provided a copy protection method for an optical information recording medium according to the first aspect, wherein if there is a link, it is determined that the copy has been made.

According to a third aspect of the present invention, there is provided a copy protection method for an optical information recording medium according to the first aspect, wherein data such as software is recorded on the optical information recording medium for each packet of a fixed size, and one or more data are recorded. A link is inserted and recorded for each packet, and at the time of reproduction, it is detected that a link is inserted for every one or a plurality of packets, and whether or not the reproduced data is copied is inspected. And

According to a fourth aspect of the present invention, there is provided the copy protection method for an optical information recording medium according to the first aspect, wherein data such as software is inserted into the optical information recording medium by interposing a link between packets of a predetermined size. Recording is performed without inserting a link every one or a plurality of packets, and at the time of reproduction, it is detected that a link is not inserted every one or a plurality of packets, and whether or not reproduced data is copied is inspected. It is characterized by having done.

According to a fifth aspect of the present invention, there is provided the copy protection method for an optical information recording medium according to the first aspect, wherein data such as software is recorded on the optical information recording medium for each packet of a predetermined size, and a specific position is recorded. In this case, a link is inserted and recorded only in a file, and upon reproduction, it is detected that the link is inserted only in a specific position, and it is checked whether or not the reproduced data is copied. .

According to a sixth aspect of the present invention, there is provided the copy protection method for an optical information recording medium according to the first aspect, wherein data such as software is recorded on the optical information recording medium for each packet of a predetermined size, and a specific position is recorded. In this case, recording is performed without inserting a link only in a file, and upon reproduction, it is detected that a link is not inserted only in a specific position, and whether or not reproduced data is copied is inspected. .

According to a seventh aspect of the present invention, there is provided the copy protection method for the optical information recording medium according to the first aspect, wherein the header addresses are sequentially read, and if a predetermined number of unreadable header addresses are consecutive, the link section is read. Is determined.

According to an eighth aspect of the present invention, there is provided an optical information recording medium on which data such as software is recorded for each packet of a fixed size, wherein the data recorded by detecting the presence / absence and position of a link at the time of reproduction is recorded. It is characterized in that it is checked whether or not the data has been copied, and if the data has been copied, a program for prohibiting data reading has been recorded.

According to a ninth aspect of the present invention, there is provided the optical information recording medium according to the eighth aspect, wherein the optical information recording medium has both an area in which data such as software is recorded in a non-rewritable manner and a recordable area.

According to a tenth aspect of the present invention, there is provided a copy protection method for an optical information recording medium, which is a method for preventing copying of data such as software recorded on the optical information recording medium. Data is recorded in a plurality of packets (variable packets) of different sizes, and during playback, it is checked whether or not the reproduced data has been copied, and if it has been copied, reading of the data is prohibited. Features.

An eleventh aspect of the present invention is the copy protection method for an optical information recording medium according to the tenth aspect, wherein at least one packet size is equal to or larger than a predetermined value, and the position of the link is detected during reproduction. It is characterized in that it is checked whether or not the reproduced data has been copied.

According to a twelfth aspect of the present invention, there is provided a copy protection method for an optical information recording medium according to the tenth or eleventh aspect, wherein a logical address or a header address is sequentially read to check whether there is an unreadable address. do it,
If a predetermined number of unreadable addresses are consecutive, it is determined that the address is a link.

According to a thirteenth aspect of the present invention, there is provided an optical information recording medium on which data such as software is recorded in packets (variable packets) of different sizes, wherein the data recorded by detecting a link position or the like during reproduction. It is characterized in that it is checked whether or not the data has been copied, and if the data has been copied, a program for prohibiting data reading has been recorded.

According to a fourteenth aspect of the present invention, there is provided the optical information recording medium according to the thirteenth aspect, wherein the optical information recording medium has both an area in which data such as software is recorded in a non-rewritable manner and a recordable area.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of a copy protection method according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the data to be recorded is
This is a fixed packet and is recorded by linkless mastering.

That is, LBN = 31 (HA = 00: 0)
The next block of 2:32, 00:02:32 frame) is continuously recorded without a link portion until the end of data, such as LBN = 32 (HA = 00: 02: 33). In the CD-R / RW writer, a link is generated when recording is performed for each packet, so whether or not a medium has been copied can be determined by inspecting the presence or absence of a link. If the packet size is 32 blocks, a link of 7 frames is continuously generated for every 39 (= 32 (packet) +7 (link)) frames of the link portion, and the header address of the link portion can be read. Since there is no header address, the header addresses are read in order, and if seven frames cannot be read continuously, these seven frames are determined to be the link part. In the case where the data is copied, reading of the data is prohibited, thereby preventing the data from being illegally copied.

Next, a second embodiment of the copy protection method of the present invention will be described with reference to FIG.

As shown in FIG. 2, the data to be recorded is
A link is inserted for each one or a plurality of fixed packets (otherwise linkless) and recorded by mastering.

With a CD-R / RW writer, it is possible to record without linking by writing once on the entire surface. However, since such complicated recording is not possible, it is determined whether or not the medium has been copied by linking every one or a plurality of packets. It can be determined by checking whether or not it has been inserted.

If the packet size is 32 blocks, for example, if the packet size is 32 blocks, if the frame cannot be read continuously from the first frame to the 33th to 39th frames, the 33rd to 39th frames are the link portion and the next packet has the first 40th frame.
If there is no frame, otherwise there is no link part, and the beginning of the next packet is 33 frames. By repeating the above, the link position is detected. When the data is copied, illegal reading of the data can be prevented by prohibiting the reading of the data.

Next, a third embodiment of the copy protection method of the present invention will be described with reference to FIG.

As shown in FIG. 3, the data to be recorded is
This is a fixed packet and is recorded by mastering without a link unit for every one or more packets.

With a CD-R / RW writer, since such complicated recording is impossible, it is determined whether or not the medium has been copied by checking whether or not a link is inserted for every one or more packets. it can. The detection of the link portion is the same as in the second embodiment. If it is copied, by prohibiting data reading,
It is possible to prevent unauthorized copying of data.

Next, a fourth embodiment of the copy protection method of the present invention will be described.

The data to be recorded is a fixed packet, a link portion is inserted at a specific position, and other portions are recorded by mastering without a link portion.

Since such a complicated recording is impossible with a CD-R / RW writer, it is possible to determine whether or not a medium has been copied by checking that a link portion exists only at a specific position. it can. For detecting a link portion, if a specific seven consecutive header addresses are read and all of them cannot be read, it is determined that the link portion is a link portion. When the data is copied, illegal reading of the data can be prevented by prohibiting the reading of the data.

Next, a fifth embodiment of the copy protection method according to the present invention will be described.

The data to be recorded is a fixed packet, which is recorded by mastering at a specific position without a link portion and at other portions with a link portion.

Since such complicated recording is impossible with a CD-R / RW writer, it is possible to determine whether or not a medium has been copied by checking that a link portion does not exist only at a specific position. it can. The detection of the link portion is the same as in the second embodiment. When the data is copied, illegal reading of the data can be prevented by prohibiting the reading of the data.

Next, a first embodiment of the optical information recording medium of the present invention will be described.

In the optical information recording medium, data and a program for detecting whether or not the medium has been copied are recorded as pits on the surface of the molded substrate by the method of any of the first to fifth embodiments. A program for controlling data reading (prohibiting reading when data is copied and permitting reading when data is not copied) is recorded on the molded substrate. A reflective layer and a protective layer are formed.

Next, a description will be given of a second embodiment of the optical information recording medium according to the present invention.

This optical information recording medium is a hybrid medium. Like a CD-RW medium, a groove is formed on the surface of a molded substrate, and a CD-R recorded by a writer
Like W media, pits are formed in some areas. In the area of the pit, in the method according to any of the first to fifth embodiments, the data and the program for detecting whether or not the medium has been copied, and reading of the data is controlled depending on whether or not the medium has been copied (copied or not) Read-out is prohibited when the data is copied, and read-out is permitted when the data is not copied).
A dye film as a recording layer, a reflective layer, and a protective layer are formed on the molded substrate.

Next, a copy protection method according to a sixth embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, the data to be recorded is
Divided into two or more packets and one packet is CD
-Recorded by mastering so as to be equal to or larger than the buffer size of the R / RW writer (3 Mbytes in FIG. 4).

With a CD-R / RW writer, data larger than the buffer size cannot be recorded without division by a method other than one-time writing (division writing), so it is not possible to copy the data so as to have the same structure. Have difficulty. Therefore,
Whether the media has been copied can be determined by detecting the position of the link (detecting that the link does not exist in the large packet).

The detection of the link portion is performed by sequentially reading out the logical address or the header address. If seven unreadable addresses are consecutive, it is determined that these seven blocks are the link portion. When the data is copied, illegal reading of the data can be prevented by prohibiting the reading of the data.

Next, a third embodiment of the optical information recording medium of the present invention will be described.

In this optical information recording medium, data, a program for detecting whether or not the medium has been copied, and a program for detecting whether or not the medium has been copied, as pits on the surface of the molded substrate, according to the method of the sixth embodiment. (A read-out is prohibited when a copy is made, and a read-out is made when the copy is not made). A layer is formed.

Next, a fourth embodiment of the optical information recording medium of the present invention will be described.

This optical information recording medium is a hybrid medium. Grooves are formed on the surface of the molded substrate, as in the case of CD-R media, and pits are formed in some areas, similarly to CD-R media recorded by a writer.

In the area of the pit, the data and the program for detecting whether or not the medium has been copied, and the reading of the data is controlled depending on whether or not the data has been copied by the method of the sixth embodiment (the data is copied). In this case, reading is prohibited, and reading is permitted when copying is not performed). On the molded substrate, a dye film as a recording layer, a reflective layer, and a protective layer are formed.

[0058]

According to the invention of the copy protection method for an optical information recording medium according to the first aspect, unlike a normal CD-ROM, since it is recorded for each packet, a general CD-ROM is used.
Copying with an R / RW writer can be made difficult. In addition, by checking whether or not the data has been copied, if the optical information recording medium is a copied optical information recording medium, it is possible to prevent illegal reading of data or the like recorded on the optical information recording medium by prohibiting data reading. .

According to a second aspect of the present invention, in the copy protection method for an optical information recording medium according to the first aspect, a link is generated in the copied optical information recording medium for each packet size. In this way, it is checked whether or not the data has been copied, and if the data has been copied, reading of the data is prohibited. Therefore, unauthorized copying of data or the like recorded on the optical information recording medium can be prevented.

According to the third aspect of the present invention, even when the entire surface is copied by a method such as Disk at once, a link exists in the copied optical information recording medium every one or a plurality of packets. Since it is difficult to record the data, it is checked whether a link exists every one or a plurality of packets, and if the data is copied, the reading of data is prohibited. It is possible to prevent unauthorized copying of data and the like.

According to the fourth aspect of the present invention, no link exists for every one or a plurality of packets in the copied optical information recording medium even when the entire surface is copied by a method such as Disk at once. Since it is difficult to record the data, it is checked whether or not a link exists every one or a plurality of packets, and if the data is copied, the reading of data is prohibited. It is possible to prevent unauthorized copying of data and the like.

According to a fifth aspect of the present invention, a link is inserted only at a specific position in a copied optical information recording medium even when the entire surface is copied by a method such as Disk at once. Is difficult, so we checked whether a link exists only in a specific position, and prohibited reading data if it was copied,
It is possible to prevent unauthorized copying of data and the like recorded on the optical information recording medium.

According to the invention of claim 6, the entire surface is written once (D
isk at once),
Since it is difficult to record at a specific position without a link on a copied optical information recording medium, it is checked whether a link exists only at a specific position and if it is copied, data reading is prohibited. Therefore, unauthorized copying of data and the like recorded on the optical information recording medium can be prevented.

According to the seventh aspect of the present invention, if there is a link portion, the header address cannot be read continuously, so that the presence or absence of the link can be easily detected by checking the header address sequentially, and the data can be easily read. Etc. can be prevented.

According to the eighth aspect of the present invention, it is checked whether data has been copied based on the presence or absence and position of the link portion, and if the data has been copied, reading of the data is prohibited. It is possible to prevent unauthorized use of data.

According to the ninth aspect of the present invention, since there are a read-only area and a recordable area where copying is difficult, data copy in the recordable area can be prevented. If data encryption software or the like is recorded in the read-only area, and data is recorded in the recordable area using this software, copying data in the recordable area can be made difficult.

The tenth aspect of the present invention relates to a conventional CD-R
Unlike the OM, since it is recorded for each packet, it is possible to make copying with a general CD-R / RW writer difficult. Furthermore, it is checked whether or not the data has been copied, and if the data has been copied, reading of the data is prohibited, so that unauthorized copying of data or the like recorded on the optical information recording medium can be prevented.

According to the eleventh aspect of the present invention, since the packet is divided and written, and the size of the packet is equal to or greater than a predetermined value (equal to or greater than the buffer size of the writer), the link position is copied so as to be the same as that of the optical information recording medium. It is impossible to read the data. Therefore, if the data is copied by checking whether or not the data is copied by checking the link position, the reading of the data is prohibited. Etc. can be prevented.

According to the twelfth aspect of the present invention, since the logical address (or header address) cannot be read continuously if there is a link portion, the logical address (or header address) can be easily checked by sequentially checking the logical address (or header address). The presence or absence of a link can be detected, and illegal copying of data or the like can be prevented.

According to the thirteenth aspect of the present invention, whether or not data has been copied is checked based on the position of the link portion, and if the data has been copied, reading of the data is prohibited. Use can be prevented.

According to the fourteenth aspect of the present invention, since there are a read-only area and a recordable area where copying is difficult, data copy in the recordable area can be prevented. If data encryption software or the like is recorded in the read-only area, and data is recorded in the recordable area using this software, copying data in the recordable area can be made difficult.

[Brief description of the drawings]

FIG. 1 is a graph illustrating a correspondence between a physical address (HA) and a logical address (LBN) as a first embodiment of the present invention.

FIG. 2 is a graph illustrating a correspondence between a physical address (HA) and a logical address (LBN) according to a second embodiment of the present invention.

FIG. 3 is a graph illustrating a correspondence between a physical address (HA) and a logical address (LBN) according to a third embodiment of the present invention.

FIG. 4 is a graph illustrating a correspondence between a physical address (HA) and a logical address (LBN) according to a sixth embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating the data structure of data additionally recorded in the ISO9660 format as an example of the related art.

FIG. 6 is a schematic diagram illustrating a data structure of data additionally written in a random access format called UDF (Universal Disk Format).

FIG. 7 is a graph illustrating the correspondence between a physical address (HA) and a logical address (LBN) as an example of a conventional fixed packet recording method.

FIG. 8 is a graph illustrating the correspondence between a physical address (HA) and a logical address (LBN) as an example of a conventional variable packet recording method.

Claims (14)

[Claims] 1. A method for preventing copying of data such as software recorded on an optical information recording medium, comprising recording data such as software on the optical information recording medium for each packet (fixed packet) of a fixed size. A copy protection method for an optical information recording medium, comprising: checking whether reproduced data has been copied; and prohibiting reading of the data if the data has been copied. 2. The copy protection method for an optical information recording medium according to claim 1, wherein if there is a link, it is determined that the copy has been made. 3. The copy protection method for an optical information recording medium according to claim 1, wherein data such as software is recorded on the optical information recording medium for each packet of a fixed size, and a link is inserted for every one or a plurality of packets. An optical information recording medium characterized by detecting that a link is inserted every one or a plurality of packets at the time of reproduction, and inspecting whether reproduced data has been copied. Copy protection method. 4. The method for copy-protecting an optical information recording medium according to claim 1, wherein data such as software is inserted into the optical information recording medium every one or a plurality of packets while a link is inserted between the packets of a fixed size. Recorded without a link inserted therein, and at the time of reproduction, detecting that a link is not inserted for every one or a plurality of packets, and inspecting whether or not the reproduced data has been copied. A copy protection method for an optical information recording medium. 5. A copy protection method for an optical information recording medium according to claim 1, wherein data such as software is recorded on the optical information recording medium for each packet of a predetermined size, and a link is inserted only at a specific position. During recording and playback, it detects that a link is inserted only at a specific position,
A copy protection method for an optical information recording medium, characterized in that it is checked whether reproduced data has been copied. 6. The method for copy-protecting an optical information recording medium according to claim 1, wherein data such as software is recorded on the optical information recording medium for each packet of a fixed size, and a link is inserted only at a specific position. A copy of an optical information recording medium characterized by detecting that a link has not been inserted only at a specific position at the time of recording, and inspecting whether or not the reproduced data has been copied. Protection method. 7. The copy protection method for an optical information recording medium according to claim 1, wherein the header addresses are sequentially read, and if a predetermined number of unreadable header addresses are consecutive, it is determined that the link section is present. A copy protection method for an optical information recording medium, comprising: 8. An optical information recording medium on which data such as software is recorded for each packet of a fixed size, and detects the presence / absence and position of a link at the time of reproduction to check whether the recorded data has been copied. An optical information recording medium characterized by recording a program for prohibiting data reading if the data is copied. 9. The optical information recording medium according to claim 8, wherein the optical information recording medium has both an area in which data such as software is recorded in a non-rewritable manner and a recordable area. 10. A method for preventing copying of data such as software recorded on an optical information recording medium, wherein the data such as software is recorded on the optical information recording medium in a plurality of packets (variable packets) of different sizes. During playback,
A copy protection method for an optical information recording medium, characterized in that it is checked whether or not reproduced data has been copied, and if the reproduced data has been copied, reading of the data is prohibited. 11. The copy protection method for an optical information recording medium according to claim 10, wherein at least one packet size is equal to or larger than a predetermined value, and data reproduced by detecting a link position during reproduction is copied. A copy protection method for an optical information recording medium, wherein whether or not the copy has been performed is inspected. 12. The copy protection method for an optical information recording medium according to claim 10, wherein the logical address or the header address is sequentially read, and it is checked whether there is an unreadable address, and the unreadable address is checked. Is determined to be a link portion if a predetermined number of consecutive copies of the optical information recording medium are consecutive. 13. An optical information recording medium in which data such as software is recorded in packets of different sizes (variable packets), and a position of a link is detected during reproduction to determine whether or not the recorded data is copied. An optical information recording medium characterized by recording a program for prohibiting reading of data when inspected and copied. 14. The optical information recording medium according to claim 13, wherein the optical information recording medium has both an area in which data such as software is recorded in a non-rewritable manner and a recordable area.