JP2002190157A - Recording medium, recording/reproducing apparatus, and recording/reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, an apparatus and a medium being useful to protection of copyrights by preventing copying unjustly onto a recording medium and utilizing the source data having copy protection, and to simultaneously ensure the compatibility that can mutually operate without trouble, between a recording/reproducing apparatus and a medium which the user has already used before the invention application and a recording/reproducing apparatus and a medium of this invention. SOLUTION: The data type flag to show the classification whether the data recorded are the data to be recorded on a reproducing-only recording medium or the data to be recorded on a recordable recording medium and the data type setting flag to indicate whether this flag is set, are added to the data recorded on a recording medium to be recorded. Then the apparatus detects whether the recording medium is either the recordable recording medium or the reproducing-only recording medium at the driving start of recording medium. Thus, the reproduction of the data is stopped when the data reproduced from three pieces of information are determined as the unauthorized copying.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the protection of the copyright of data recorded on a recording medium such as a DVD, and more particularly, to a recording medium having a copyright protection mechanism and a method for processing this medium. The present invention relates to a recording / reproducing device and a recording / reproducing method applied to these devices.

[0002]

2. Description of the Related Art Digital video disks (DV)
With the practical use of large-capacity digital recording media such as D), contents such as video information and audio information can be
High-quality, large-volume recording is now possible. Since digital information has the feature that it does not deteriorate due to transmission, it can be easily sent to remote places in time and space while maintaining high quality. On the other hand, this feature leads to very easy duplication of exactly the same information as the original, so from the viewpoint of protecting the copyright of the content, unauthorized use without the permission of the copyright holder is considered. Strong measures have been required to prohibit unauthorized copying or disable unauthorized copying.

[0003] A DVD is a read-only disk (DVD-RO) for a content provider to copy and distribute in large quantities.
In addition to M), there are a write-once disc (DVD-R) and a rewritable disc (DVD-RW) that can be recorded by the user. In particular, DVD-R and DVD-RW adopt a disk format similar to that of DVD-ROM in order to enable a recorded disk to be easily reproduced by a player for a read-only disk. For this reason, D
Exactly the same data as a DVD-ROM can be recorded on a VD-R or DVD-RW disc, including control information indicating the type of the disc. There is also a possibility that the type of the disc (DVD-ROM, DVD-R, DVD-RW, etc.) cannot be determined. Thus, DVD-R
DVD-R or DVD recording exactly the same data as OM
-RW is also called a clone disk.

[0004] The feature of this clone disk is that the DVD-
Although it is very suitable for trial writing at the time of authoring to produce ROMs, it also shows that it is easy to illegally copy and use DVD-ROM discs using DVD-R and DVD-RW discs. ing. Under these circumstances, there has been a growing demand for technology to prohibit unauthorized copying and use thereof for copyright protection.

As a countermeasure, currently proposed methods include D
A difference in track shape between the VD-ROM and the DVD-R / DVD-RW is detected on the playback device side, and is compared with data of the disc type recorded in the control information area of the disc.
There is a method for determining whether or not the copy is illegal. In particular,
Despite the fact that the read-only DVD-ROM is written in the control information of the disc, the track shape is DVD-RD.
If the disk is a VD-RW disk, it is regarded as a clone disk, so that the disk is determined to be an illegally copied disk. If this method is adopted, it is considered that a clone disk can be detected and eliminated.

Now, unlike a clone disk, the control information of the disk is not copied, but only the portion where the information related to the data of the content is recorded is copied in its entirety, that is, a so-called bit-by-bit copy method. In the case of a copied disc, it cannot be determined that the disc is an illegal copy by the above method. In the bit-by-bit copy, not only user data recorded in a sector but also system information and management information which a user cannot normally access are read and copied in their entirety. There is a need for an effective method for such illegal copying.

At present, most of the original source data whose copyright is to be protected is recorded on a read-only recording medium and distributed. Therefore, if the source data recorded on the read-only type recording medium is copied to a recordable type recording medium, by devising a means for detecting this, it is possible to solve most of the illegal copy problem. it can. However, when a huge number of DVD playback devices and DVD disks are already on the market and the users are using them, the copyright protection method newly devised is based on the existing recording / playback device when introduced. It is necessary to consider that there is a restriction that the recording medium is not practically used if the compatibility is lost.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a method for copy-protecting a medium on which information is recorded or a signal received on an information transmission path to a recording medium such as a recordable optical disk. It is an object of the present invention to provide a method, an apparatus, and a medium that help strengthen copyright protection that prevents copied source data from being illegally copied and used. At the same time, the present invention also allows a recording / reproducing apparatus or recording medium already used by a user before the present invention is applied and a recording / reproducing apparatus or recording medium to which the present invention is applied to operate without any trouble. It is also an issue to ensure compatibility as much as possible.

[0009]

In the recording medium according to the first aspect, whether data to be recorded is data to be recorded on a read-only recording medium or data to be recorded on a recordable recording medium. A data type flag indicating the type and a data type setting flag indicating whether the flag is set are added to the data to be recorded on the recording medium and recorded.

In the recording medium according to the second aspect, the data type flag and the data type setting flag are set to 1 or 2
The above sectors are added as a unit.

In the recording medium according to the third aspect, the data type flag and the data type setting flag are added to an area that cannot be accessed as user data, such as a header area of a sector.

In the recording medium according to the fourth aspect, the data type setting flag is recorded in the empty area of the recording medium, and the value of the data type setting flag is set as follows. (1) The default value preset in the empty area is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set.

According to a fifth aspect of the present invention, there is provided a recording method for a recording medium.
Determine the value of the data type flag according to the type of data to be recorded, that is, data to be recorded on a read-only recording medium or data to be recorded on a recordable recording medium, and set the data type flag The value of the data type setting flag is determined according to the state of whether or not to perform the setting, and the data type flag and the data type setting flag are recorded in addition to the data recorded on the recording medium.

According to a sixth aspect of the present invention, in the recording method of the fifth aspect, the data type setting flag is further recorded in an empty area of the recording medium, and the value of the data type setting flag is set as follows. I do. (1) The default value preset in the empty area is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set.

According to a seventh aspect of the present invention, there is provided a recording medium reproducing method.
A first step of detecting whether the type of the recording medium is a read-only type or a recordable type; and detecting whether a data type flag is set based on a data type setting flag added to data on the recording medium. In the second step and the data type flag added to the data on the recording medium, the type of the recorded data is recorded on the data to be recorded on the read-only recording medium or on the recordable recording medium. A third step of detecting whether the data should be
Further, when the value of the data type setting flag detected in the second step indicates that the data type flag is set, the type of the recording medium on which the data detected in the third step is to be recorded is the first type. The step of stopping the reproduction when the type of the recording medium does not match the type detected in the step is included as the fourth step.

According to the recording apparatus of the present invention, the data type flag value determining means for determining the value of the data type flag in accordance with the type of data to be recorded, and in accordance with whether the data type flag is set or not. Data type setting flag value determining means for determining the value of the data type setting flag, and a recording means for adding the determined data type flag and the data type setting flag to the data to be recorded on the recording medium and recording, When recording a value indicating that the data type flag is set in the data type setting flag, the data to be recorded is recorded on a recordable recording medium regardless of the content of the data to be recorded, as the value of the data type flag. A value indicating that the data is to be recorded is recorded.

According to a ninth aspect of the present invention, in the recording apparatus of the eighth aspect, a data type setting flag is further recorded in an empty area of the recording medium, and the value of the data type setting flag is set as follows. I do. (1) The default value preset in the empty area is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set.

According to a tenth aspect of the present invention, there is provided a recording medium reproducing apparatus, comprising: a discriminating means for detecting a type of a recording medium; a data type setting flag reproducing means for reading a data type setting flag on the recording medium; A data type flag reproducing means for reading the flag, and a reproduction control means for controlling reproduction of data on the recording medium, and a discriminating means for judging whether the type of the recording medium is a reproduction-only type or a recordable type; The type setting flag reproducing means detects whether or not the data type flag is set, and the data type flag reproducing means determines whether the type of recording data is data to be recorded on a read-only recording medium or a recordable recording medium. Detect whether the data should be recorded in the When the value of the data type setting flag detected by the data type setting flag reproducing means indicates that the data type flag is set, the type of the data detected by the data type flag reproducing means is determined by the determining means. When the type does not match the type of the recording medium detected in step 2, the reproduction of this data is controlled to be stopped.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. Embodiment 1 FIG. First, the concept of the invention will be described. As a data reproducing procedure, first, in the recording / reproducing apparatus, when the apparatus starts driving the recording medium, it is detected whether the recording medium is a reproduction-only type or a recordable type. Next, it is detected whether or not the data type flag is set based on the data type setting flag added to the data on the recording medium. further,
The type of the recorded data is detected based on the data type flag added to the data on the recording medium. This is a type indicating whether the recorded data is data to be recorded on a read-only recording medium or data to be recorded on a recordable recording medium. According to the present invention, when data reproduced from the above three detected information is determined to be an illegal copy, the reproduction of the data is stopped to prohibit the use of the illegal copy, thereby protecting the copyright. Is to do.

Judging from the contents of the data type setting flag, when the data type flag is set, the recorded data is to be recorded on a read-only recording medium or recorded on a recordable recording medium. The type of data to be read is detected and compared with the type of recording medium (reproduction-only type or recordable type) detected by the recording / reproducing apparatus at the start of driving of the recording medium. As a result, if the type of the data and the type of the recording medium match, it is determined that the data is legitimate data, and reproduction is performed. If they do not match, the data is determined to be illegally copied data and reproduction is not performed. .

Judging from the contents of the data type setting flag, when the data type flag is not set, the data type is not compared with the type of the recording medium, and the data is reproduced. The purpose of adding a flag indicating the type of data is to prevent the use of unauthorized copying, and it is not necessary to add a data type setting flag or data type flag to copy-free data.

In the recording medium used before the above-mentioned present invention is applied, the data type setting flag is not written in the first place. Therefore, the bit assignment of the data type setting flag is determined as follows. That is, a default value recorded when the present invention is not applied to a portion corresponding to the data type setting flag on the recording medium is a value indicating that the data type flag is not set, and a value different from the default value is set. Is a value indicating that the data type flag is set. In this manner, when the recording medium used before the application of the present invention is reproduced, the value detected from the portion corresponding to the data type setting flag is a value indicating that the data type flag is not set. Therefore, data can be reproduced without any trouble.

If these flags are added for each predetermined unit of the physical sector of the recording medium, it is possible to determine whether or not to apply the present invention for each recording unit. In other words, even if the recording medium is started to be used before the present invention is applied, if the recording is subsequently performed by the recording apparatus to which the present invention is applied, the newly recorded portion is not used for unauthorized copying. Can be provided.

The above situation will be described in detail using a specific example shown in FIG. FIG. 1 shows a block configuration of a reproducing apparatus to which the present invention is applied. Data is recorded on a recording medium such as an optical disk, and the recording medium is rotated by a disk rotation motor when driven. Data recorded on a recording medium by a predetermined signal method is reproduced by an optical head and sent to data reproducing means. The data reproducing means demodulates and decodes the recorded signal and reproduces the data so as to read it out as sector data. At the start of driving of the recording medium, information for determining the type of the recording medium is extracted by the data reproducing means from the control information recorded at a predetermined position on the recording medium and the characteristics of the physical shape of the recording medium. It is sent to the determination means. The medium type discriminating means detects whether the recording medium being driven is a reproduction-only type or a recordable type, and sends the result to the reproduction control means.

When reproducing user data from a recording medium, data reproduced in sector units is sent to a reproduction control means, a data type setting flag reproducing means, and a data type flag reproducing means as an output of the data reproducing means. The reproduction control means permits reproduction based on the information detected by the medium type discriminating means, the data type setting flag reproducing means, and the data type flag reproducing means as to whether or not the reproduced data is to be outputted as the reproduced data from the reproducing apparatus as it is. It is determined whether the condition is satisfied. If the condition is not met, output as reproduction data is prohibited.

FIG. 2 shows an example of the format of a sector.
The sector is an address information area where address information is recorded,
It comprises a system information area in which system information is recorded, a user data area in which user data information is recorded, and an error detection information area in which error detection information is recorded to make it possible to detect whether or not there is an error in the reproduction data of this sector. It is assumed that the system information includes existing information used regardless of the present invention, but other free areas are left. This is the part of the sky area 1, the sky area 2, and the sky area 3 described in “Configuration of system information area when the present invention is not applied” in FIG. It is assumed that the use of these portions is undefined, and “0” is entered as a default value in such a case. Now, in applying the present invention, FIG.
, The empty area 1 is defined as a data type setting flag SDTF, and the empty area 2 is defined as a data type flag DTF, as described in “Configuration of system information area when the present invention is applied”. I do.

In the definition of the value of the data type setting flag SDTF, "0" indicates that the data type flag DTF has not been set, and "1" indicates that the DTF has been set. The definition of the value of the data type flag DTF indicating the type of the recorded data is such that “0” indicates that the data recorded in the user data area is data to be recorded on the read-only recording medium. , "1" indicates that the data recorded in the user data area is data to be recorded on a recordable recording medium. The data type setting flag reproducing means and the data type flag reproducing means in FIG. 1 reproduce the values of the data type setting flag SDTF and the data type flag DTF, respectively.

As described above, according to the present invention, when data reproduced from the above three detected information is determined to be an illegal copy, the reproduction of the data is stopped to prohibit the use of the illegal copy. Thus, the copyright is protected, and the determination conditions are described below. 3A and 3B show conditions of reproduction control when a recording medium is reproduced by the reproducing apparatus of the present invention. FIG. 3A shows a case of a recording medium on which a flag of the present invention is recorded, and FIG. Shows the case of a recording medium on which is not recorded.

First, in the case of (a), if the type of the recording medium determined by the medium type determining means is a read-only type, (SDTF,
The combination of (DTF) is (0,0) or (1,0). At the time of (0, 0), since the data type flag is not set, the type of the user data is not particularly limited.
At the time of 0), the type of user data is data to be recorded on a read-only recording medium. For example, a DVD video disk of an original board. Since it can be determined that the possibility of copy-free or unauthorized copying is low, both are permitted to reproduce data.

If the type of the recording medium determined by the medium type determining means is a recordable type, the combination of (SDTF, DTF) is (1, 0) or (1, 1). At (1,0),
Despite being a recordable medium, the type of user data is data to be recorded on a read-only recording medium. That is, since the type of data and the type of recording medium do not match, for example, it is determined that the original DVD video disk has been illegally copied by bit-by-bit copying, so that data reproduction is prohibited.
When the combination of (SDTF, DTF) is (1,1),
The type of user data is data to be recorded on a recordable recording medium. That is, since the type of data matches the type of recording medium, and it is determined that the possibility of unauthorized copying is low, data reproduction is permitted.

In the case of (b), neither the data type setting flag nor the data type flag is originally defined in this recording medium, but when this part is reproduced by the reproducing apparatus of the present invention, (SDTF, DTF) The combination is (0,0)
Interpret as Regardless of whether the recording medium is a read-only type or a recordable type, it is assumed that the data type flag is not set, so the comparison between the data type and the recording medium type is not performed.
In both cases, data reproduction is permitted.

Next, the operation of the recording / reproducing apparatus before the present invention is applied will be described for ensuring compatibility. When a recording / reproducing apparatus to which the present invention has not been applied reproduces a recording medium to which the present invention has been applied, it does not have a function of detecting a data type setting flag or a data type flag of the recording medium in the first place. Data can be reproduced without any trouble similarly to a recording medium to which is not applied. However, in order to prevent the recording / reproducing apparatus from reproducing the portion corresponding to the data type setting flag on the recording medium or using the value written there, the present invention is not limited to the data type setting. It is necessary to assign the location of the type setting flag to a portion on the recording medium that has not been used before applying the present invention.

As described above, even when the present invention is applied from the middle, the present invention is applied to both the recording medium used before the application and the recording medium used after the application, or on the same medium. Even if a part that has not been applied and a part that has been applied are mixed, operation can be performed without causing a compatibility problem. Further, even in a recording / reproducing apparatus to which the present invention is not applied, it is possible to operate both a recording medium to which the present invention is not applied and a recording medium to which the present invention is applied without causing a compatibility problem. become.

The above situation will be described in detail using a specific example shown in FIG. 4A and 4B show reproduction control conditions when a recording medium is reproduced by a conventional reproducing apparatus. FIG. 4A shows a case of a recording medium on which a flag of the present invention is recorded, and FIG. This shows the case of a recording medium on which no recording is performed.

First, in the case of (a), if the type of the recording medium determined by the medium type determining means is a read-only type, (SDTF,
The combination of (DTF) is (0,0) or (1,0). If the type of recording medium is a recordable type, (SDT
The combination of (F, DTF) is (1, 0) or (1, 1). In any case, as described above, a playback device to which the present invention is not applied does not have a function of detecting a data type setting flag or a data type flag or checking a match with the type of a recording medium. Data is reproduced in the same manner as a conventional recording medium to which the present invention is not applied.

Next, in the case of (b), the function of detecting the data type setting flag and the data type flag and checking the coincidence with the type of the recording medium is performed for the recording medium in which neither the data type setting flag nor the data type flag is defined. Will be played back by a playback device that does not have. Reproduction is performed as before.

Here, in order to explain the necessity and validity of the data type setting flag, a simple case where only the data type flag is defined and the data type setting flag is not defined will be described. In the following description, a case where only this data type flag is defined for a recording / reproducing apparatus and a recording medium will be described as a simplified technique. The problem when applying the simplified technology occurs when a recording / reproducing apparatus to which the simplified technology is applied reproduces a recording medium on which the simplified technology is not applied. The data type flag is not written on the recording medium recorded without applying the simplified technology.

When the bit assignment of the data type flag is determined as follows, the following problem occurs. In other words, the default value recorded before the simplified technique is applied to the portion corresponding to the data type flag on the recording medium is set as a value indicating a read-only recording medium, and a value different from the default value is recorded. This is the case where the value indicates the recording medium. In this case, when reproducing a recordable recording medium that was used before the simplified technique was applied, a value indicating a reproduction-only recording medium was detected from a portion corresponding to the data type flag, so that data was recorded. The type and the type of the recording medium do not match, and even if the data is properly recorded, it is determined that the data is illegally copied, and the reproduction is stopped.

It should be noted here that when a new technology is additionally introduced, at least the newly introduced technology must be used in a recording / reproducing apparatus already owned by the user before the new technology is applied. Ensuring compatibility that enables reproduction of the applied recording medium is sometimes the most important function from the user's point of view. In terms of ensuring such compatibility, the simplified technology has a serious problem in practical use.

The above situation will be described in detail using a specific example shown in FIG. FIG. 5 shows the conditions of the reproduction control when the recording medium is reproduced by the reproducing device of the simplified technique, and FIG.
In the case of a recording medium that records the flag of the simplified technology,
(B) shows the case of a recording medium on which the flag of the simplified technique is not recorded. The difference from FIG. 3 is that since the data type setting flag is not defined, there is no SDTF, the empty area 1 is left as it is, and the default value “0” is inserted. In this simplified technique, the block diagram of the reproducing apparatus is obtained by deleting the data type setting flag reproducing means from FIG.

First, in the case of (a), if the type of the recording medium determined by the medium type determining means is the reproduction-only type, the DTF is (0). At this time, the type of the user data is data to be recorded on a read-only recording medium, and it can be determined that the possibility of unauthorized copying is low, so that data reproduction is permitted.

If the type of the recording medium determined by the medium type determining means is a recordable type, the DTF is (0) or (1).
At the time of (0), the type of user data is data to be recorded on a read-only recording medium, despite being a recordable medium. That is, since the type of data and the type of recording medium do not match, for example, it is determined that the original DVD video disk has been illegally copied by bit-by-bit copying, so that data reproduction is prohibited. When the DTF is (1), the type of user data is data to be recorded on a recordable recording medium.
In other words, the type of data matches the type of recording medium,
Since the possibility of unauthorized copying is determined to be low, data reproduction is permitted.

In the case of (b), neither the data type setting flag nor the data type flag is originally defined in this recording medium, but when this part is reproduced by the reproducing apparatus of the present invention, the DTF is set to (0). Interpret. That is, the type of user data is regarded as data to be recorded on a read-only recording medium. Therefore, when the recording medium is of the read-only type, the data is reproduced. However, when the recording medium is of the recordable type, the type of data does not match the type of the recording medium, and all reproduction is prohibited. As described above, this is a problem in ensuring compatibility. The data recorded by the conventional recording apparatus has a drawback that it cannot be reproduced even if the data is properly recorded.

If the value of the data type flag is reversed, that is, the default value used before the simplified technology is applied is set as a value indicating a recordable recording medium, and the default value and If a different value is used to indicate a read-only recording medium, another problem occurs.
This will be described as a second simplified technique. In a read-only recording medium created before the second simplified technique is applied, the same value as the value indicating the recordable recording medium is recorded in a portion corresponding to the data type flag. Become. If this read-only type recording medium is used as the original information and the source data is illegally copied to a recordable type recording medium by bit-by-bit copy, the part corresponding to the data type flag can also be recorded. Is recorded. When the recordable recording medium illegally recorded is reproduced in this manner, a value indicating the recordable recording medium is detected from the portion corresponding to the data type flag, and as a result, the data type and the recording medium type are changed. Since they match, it is determined that the data is legitimate data and reproduction is performed.

In other words, with regard to data on a read-only recording medium created before the second simplified technique is applied, it is necessary to ensure that copy-protected source data is illegally copied or used. The goal of prevention cannot be achieved. Since a huge number of such read-only recording media are already on the market, sufficient protection against copyright cannot be expected with the simplified technology described here.

When a read-only recording medium created before the application of the second simplified technique is played back,
Since the value indicating the recordable recording medium is detected from the part corresponding to the data type flag, the data type does not match the recording medium type, and the legitimate read-only data is determined to be illegally copied data. There is also a big problem that the playback is stopped.

The above situation will be described in detail using a specific example shown in FIG. FIG. 6 shows the conditions of the reproduction control when the recording medium is reproduced by the reproducing device of the second simplified technique,
(A) shows a case of a recording medium on which a flag of the second simplified technique is recorded, and (b) shows a case of a recording medium on which a flag of the second simplified technique is not recorded. The difference from FIG.
The point is that the value “0” of F is replaced with “1”.

First, in the case of (a), if the type of the recording medium determined by the medium type determining means is the reproduction-only type, the DTF is (1). At this time, the type of the user data is data to be recorded on a read-only recording medium, and it can be determined that the possibility of unauthorized copying is low, so that data reproduction is permitted.

If the type of the recording medium determined by the medium type determining means is a recordable type, the DTF is (1) or (0).
In the case of (1), the type of user data is data to be recorded on a read-only recording medium, despite being a recordable medium. That is, since the type of data and the type of recording medium do not match, for example, it is determined that the original DVD video disk has been illegally copied by bit-by-bit copying, so that data reproduction is prohibited. When the DTF is (0), the type of user data is data to be recorded on a recordable recording medium.
In other words, the type of data matches the type of recording medium,
Since the possibility of unauthorized copying is determined to be low, data reproduction is permitted. As described above, this is a problem that the copyright of the data on the existing original read-only recording medium cannot be protected.

In the case of (b), neither the data type setting flag nor the data type flag is originally defined in this recording medium, but when this part is reproduced by the reproducing apparatus of the present invention, the DTF is set to (0). Interpret. That is, the type of user data is regarded as data to be recorded on a recordable recording medium. Therefore, when the recording medium is a recordable type, it is reproduced, but when it is a reproduction-only type, the type of data and the type of the recording medium do not match, and all reproduction is prohibited. As described above, this is a major compatibility problem.

According to the above description, when the simplified technique in which only the data type flag is defined and the data type setting flag is not defined is applied, the problem remains in any case and the purpose of introducing the data type flag is achieved. It turns out that you can't do that. In addition, if both the data type flag and the data type setting flag are defined, there is no room for such a problem.Therefore, while ensuring compatibility, the copy-protected source data is illegally copied or used. It can also be understood that the goal of preventing the situation can be achieved.

Embodiment 2 The configuration of a recording apparatus when the present invention is applied will be described. FIG. 7 shows the recording / data to which the present invention is applied.
2 shows a block configuration of a playback device. The difference from the playback apparatus shown in FIG. 1 is that a recording control unit, a data recording unit, a data type setting flag value determining unit, and a data type flag value determining unit are added. This difference will be described. .

When recording user data on a recording medium, recording data divided in sector units is input from an external device to the recording control means. In the recording control means, FIG.
According to the example of the format of the sector shown in (1), information necessary for recording on a recording medium such as system information is added to the recording data and sent to the data recording means. At this time,
The data type flag value determining means and the data type setting flag value determining means add the data type flag and the data type setting flag value to be recorded on the recording medium to the data, respectively. The data type flag value determining means determines and gives a data type flag value corresponding to the type of data to be recorded. The data type setting flag value determining means determines and gives the value of the data type setting flag according to whether the data type flag is set.

When a value indicating that the data type flag is to be set is recorded in the data type setting flag, the data to be recorded can be recorded as the value of the data type flag regardless of the content of the data to be recorded. Gives a value indicating that the data is to be recorded on a type recording medium. The value of the data type setting flag is as follows. As shown in FIGS. 3 and 4, a value indicating that the data type flag is not set is recorded in the empty area 1 corresponding to the data type setting flag before the present invention is applied. A default value “0” is assigned, and a value “1” different from the default value is assigned as a value indicating that the data type flag is set.

The recording data to which the data type flag determined in this way and the data type setting flag are added is sent to the data recording means, and is encoded and processed according to a predetermined signal system.
After being modulated, it is recorded on a recording medium via an optical head. Recording is performed in sector units, and the data type flag and the data type setting flag are also added according to the sector format. Therefore, copyright protection by setting the data type can be managed for each predetermined unit of sector. is there. In addition, since such a flag is added to an area that cannot be accessed as user data in a sector, it is difficult for the user to modify the flag, and strong protection is possible.

[0056]

According to the present invention, it is possible to realize a function of strengthening copyright protection, that is, preventing copy-protected source data from being illegally copied or used.

At the same time, the recording / reproducing apparatus or recording medium already used by the user before the present invention is applied, and the recording / reproducing apparatus or recording medium to which the present invention is applied,
It has become possible to ensure compatibility so that they can operate without any trouble. This is a great practical advantage in terms of user convenience.

In a recording / reproducing apparatus to which the present invention is applied, the present invention is applied to both a recording medium used before application and a recording medium used after application, or on the same medium. Even if the missing part and the applied part are mixed,
It became possible to operate without causing compatibility problems.

In addition, it is possible to operate a recording / reproducing apparatus to which the present invention is not applied without causing a compatibility problem for both a recording medium to which the present invention is not applied and a recording medium to which the present invention is applied. Is now possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording medium reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 shows a sector format of the recording medium according to the first embodiment of the present invention.

FIG. 3 shows conditions of recording medium reproduction by the reproduction device of the present invention shown in Embodiment 1 of the present invention.

FIG. 4 shows conditions of recording medium reproduction by the conventional reproducing apparatus shown in the first embodiment of the present invention.

FIG. 5 shows conditions for reproducing the recording medium by the reproducing apparatus of the simplified technique shown in the first embodiment of the present invention.

FIG. 6 shows conditions of recording medium reproduction by the reproduction device of the simplified technique shown in the first embodiment of the present invention.

FIG. 7 is a block diagram of a recording / reproducing apparatus for a recording medium according to a second embodiment of the present invention.

Claims (10)

[Claims] 1. A data type flag indicating whether data to be recorded is data to be recorded on a read-only recording medium or data to be recorded on a recordable recording medium; A recording medium in which a data type setting flag indicating whether or not the data is set is added to the data to be recorded. 2. The recording medium according to claim 1, wherein said data type flag and said data type setting flag are added in units of one or more sectors. 3. The recording medium according to claim 2, wherein the data type flag and the data type setting flag are added to an area that cannot be accessed as user data. 4. The recording medium according to claim 1, wherein the data type setting flag is recorded in an empty area of the recording medium, and the value of the data type setting flag is set as follows. (1) A default value set in the empty area in advance is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set. 5. A data type flag value is determined according to a type of data to be recorded, data to be recorded on a read-only recording medium or data to be recorded on a recordable recording medium, The value of the data type setting flag is determined in accordance with the state of whether or not the data type flag is set, and the data type flag and the data type setting flag are recorded by adding the value to the data recorded on the recording medium. The recording method that was used. 6. The recording method according to claim 5, wherein the data type setting flag is recorded in an empty area of the recording medium, and the value of the data type setting flag is set as follows. (1) A default value set in the empty area in advance is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set. 7. A reproducing method for reproducing a recording medium,
A first step of detecting whether the type of recording medium is a read-only type or a recordable type; and detecting whether a data type flag is set by a data type setting flag added to data on the recording medium. And the data type flag added to the data on the recording medium to determine whether the type of the recorded data is data to be recorded on a read-only recording medium or a recordable recording medium. A third step of detecting whether the data should be recorded in the, and if the value of the data type setting flag detected in the second step indicates that the data type flag is set, the third step When the type of the recording medium on which the data detected in the step is to be recorded does not match the type of the recording medium detected in the first step, the reproduction is stopped. Reproducing method includes a step, a. 8. A data type flag value determining means for determining a value of a data type flag according to a type of data to be recorded, and a data type setting flag value according to whether or not the data type flag is set. A data type setting flag value determining means for determining, and a recording means for adding the determined data type flag and the data type setting flag to data to be recorded on a recording medium and recording the data type flag. When recording a value indicating that a flag is to be set, as the value of the data type flag, regardless of the content of the data to be recorded
A recording device that records a value indicating that data to be recorded is data to be recorded on a recordable recording medium. 9. The recording apparatus according to claim 8, wherein the data type setting flag is recorded in an empty area of the recording medium, and the value of the data type setting flag is set as follows. (1) A default value set in the empty area in advance is a value indicating that the data type flag is not set. (2) A value different from the default value is a value indicating that the data type flag is set. 10. A reproducing apparatus for reproducing a recording medium, a discriminating means for detecting a type of the recording medium, a data type setting flag reproducing means for reading a data type setting flag on the recording medium, Data type flag reproducing means for reading a data type flag; and reproducing control means for controlling reproduction of data on the recording medium. The discriminating means determines whether the type of the recording medium is a reproduction-only type or a recordable type. The data type setting flag reproducing means detects whether or not a data type flag is set, and the data type flag reproducing means records the type of the recorded data on a read-only recording medium. Detecting whether the data is to be recorded or data to be recorded on a recordable recording medium, and the reproduction control means resets the data type setting flag. When the value of the data type setting flag detected by the means indicates that the data type flag is set, the type of the data detected by the data type flag reproducing means is the same as the type of the recording medium detected by the determining means. A playback device that controls playback to stop when not performed.