JP4131660B2 - Recording medium, recording / reproducing apparatus, and reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium, a recording / reproducing apparatus, and a reproducing apparatus, and is particularly suitable for use when adding information for copyright protection or the like to an existing recording medium.
[0002]
[Prior art]
MD (Mini Disc) is widely used as a recording medium for digital recording. This MD is rapidly becoming widespread as an alternative to existing tape media because it is compact and lightweight, has excellent formability, and has achieved a long time while suppressing deterioration in sound quality by data compression technology. In addition to audio recording, standards such as MD data for data recording and MD pictures for recording still images have been announced.
[0003]
The configuration of an existing MD and its recording / reproducing apparatus is described in Non-Patent Document 1, for example. Hereinafter, the configuration of an existing MD and its recording / reproducing apparatus will be described with reference to FIGS.
[0004]
FIG. 9 shows the configuration of an existing MD disk.
[0005]
The MD disc is roughly divided into a TOC (Table of Contents) area and a recordable area. Among these, a pre-pit is formed in a spiral track shape in the TOC area, and information such as a disc recording time difference and a recording laser power is recorded by the pre-pit. In the recordable area, guide grooves are formed in a spiral track shape, and information is magneto-optically recorded on the guide grooves. The guide groove meanders (wobbles) at a predetermined frequency in the radial direction, and an absolute address (address) on the track is recorded by the wobble frequency.
[0006]
Furthermore, the UTOC (User Table of Contents) area is allocated as the innermost peripheral position of the recordable area. In this UTOC area, the recorded song start address, disc name, title of each song, artist name, etc. Is recorded magneto-optically. Audio information that is recording information is recorded in an area following the UTOC of the recordable area.
[0007]
FIG. 10 shows a configuration diagram of an MD apparatus for recording and reproducing information on the MD disk.
[0008]
In the figure, the ECC encoder 1 adds an error correction code to the recording data. The modulation circuit 2 performs modulation processing such as NRZI plus on the recording data to which the error correction code is added. The drive signal generation circuit 3 converts the modulated recording data into a recording signal. The magnetic head drive circuit 4 drives the magnetic head 4 according to the drive signal, and applies a magnetic field according to the recording signal to the disk 200. The laser drive circuit 6 causes the semiconductor laser 71 to emit a pulse beam corresponding to the recording laser power or a continuous beam corresponding to the reproduction laser power.
[0009]
The pickup 7 includes a semiconductor laser 71 that emits laser light in accordance with control from the laser driving circuit 6, a photodetector 72 that receives reflected light from the disk 200, and an objective for converging the laser light on a track on the disk. An optical system for guiding laser light from the lens and the semiconductor laser 71 to the objective lens and the photodetector is provided.
[0010]
The reproduction signal amplifying circuit 8 performs arithmetic processing on the sensor output from the photodetector 72, and generates and outputs signals such as an RF signal, a tracking error signal, and a focus error signal. The waveform generation circuit 9 shapes the reproduction RF signal from the reproduction signal amplification circuit 8 and outputs it to the decoding circuit 10. The decoding circuit 10 performs processing such as Viterbi decoding and NRZI plus demodulation on the waveform-shaped RF signal to generate read data.
[0011]
The ECC decoder 11 performs error correction processing on read data from the decoding circuit 10 using an error correction code, and generates reproduction data. The reproduction circuit 12 performs a process such as DA conversion on the reproduction data from the ECC decoder 11 to generate a reproduction signal, and supplies this to the speaker.
[0012]
The clock signal generation circuit 13 generates a recording / reproduction clock based on the RF signal or tracking error signal from the reproduction signal amplification circuit 8. The address generation circuit 14 reproduces the address recorded by the wobble of the guide groove based on the tracking error signal from the reproduction signal amplifier circuit 8.
[0013]
The servo circuit 15 generates a tracking servo signal and a focus servo signal based on the tracking error signal and the focus error signal from the reproduction signal amplifying circuit 8 and supplies them to the servo mechanism 16. Further, a disk rotation control signal is generated based on the clock from the clock signal generation circuit 13 and supplied to the spindle motor 17. The servo mechanism displaces the objective lens in the pickup 7 in the focus direction and the tracking direction in accordance with the servo signal from the servo circuit 15, thereby causing the laser light from the pickup 7 to converge and follow on the track.
[0014]
FIG. 11 shows a flowchart of processing executed in the MD device prior to the recording / reproducing operation.
[0015]
When the MD cartridge is mounted on the MD device (S401), the pickup 7 is moved to the innermost circumferential position of the disk, that is, the TOC area (S402), and focus trial (S403) and tracking adjustment (S404) are executed. Here, if any of the focus trial and tracking adjustment results in an error, the MD cartridge is ejected, and the process ends. On the other hand, if both the focus trial and the tracking adjustment are good, the TOC information is read from the TOC area and stored in the memory (not shown in FIG. 2) in the MD device (S405). Then, a recording or reproducing operation is executed in response to a user instruction input (S406).
[0016]
[Non-patent literature]
Published by Denpa Shimbun, “All about MD” (published on September 20, 1999, second print)
[0017]
[Problems to be solved by the invention]
In the MD, information is digitized and recorded, so a copy can be easily created while maintaining high sound quality. Therefore, in MD, SCMS (Serial Copy Management System) is adopted in order to prevent such digital copy and appropriately protect the rights of the author, and digital copy is restricted to only one generation. . Information about SCMS is recorded in the UTOC area of the MD.
[0018]
However, since the SCMS information is magneto-optically recorded, if the SCMS information is also copied at the same time, the above copy restriction becomes ineffective. For example, when SCMS information is set so that one-generation digital copying is possible, if the recorded information including UTOC information is copied to another MD, a further copy is generated using the copy MD. To be allowed. Furthermore, if the recording information including the UTOC information of the copy MD is copied to another MD, the creation of the copy MD can be repeated infinitely.
[0019]
Such a problem can be prevented by executing copy prevention management with information that cannot be copied.
[0020]
For example, a method in which information unique to each MD, that is, disc identification information (media ID) is recorded in the TOC area of the MD by prepits. If the recorded information is encrypted and recorded by the recorded media ID and the read data is decrypted by the media ID at the time of reproduction, the recorded information on the MD is in a state in which the MD is attached to the reproducing apparatus. In other words, unless the media ID can be acquired by the playback device, playback cannot be performed.
[0021]
However, when such a disc is reproduced by an existing MD device, the encrypted recording information is reproduced as it is, and therefore, undesirable reproduction such as generation of abnormal noise is performed. The same applies to recording. When the above-mentioned disc is recorded by an existing MD device, the recording information is recorded as it is without being encrypted by the media ID. When the information recorded in this way is played back by a playback device corresponding to the above-mentioned disc, a process for decrypting the read information is executed even though it is not encrypted. Undesirable reproduction is executed.
[0022]
Accordingly, the present invention primarily provides a recording medium and a recording / reproducing apparatus for the recording medium that cannot cause an inconvenient recording and / or reproducing operation even with existing apparatuses while ensuring copyright protection. The task is to do.
[0023]
In addition, more comprehensively, not only thorough copyright protection, but also recording and / or playback operations that are inconvenient even with existing devices when pre-recording in a state where predetermined information cannot be altered for other purposes. It is an object of the present invention to provide a recording medium and a recording / reproducing apparatus for the recording medium that cannot cause the problem.
[0024]
[Means for Solving the Problems]
In view of the above problems, the present invention has the following features.
[0025]
According to the first aspect of the present invention, there is provided information for identifying a recording medium in a form in which a reading error occurs in an existing recording / reproducing apparatus in an area read by the existing recording / reproducing apparatus prior to the start of recording or reproducing operation. Is a recording / reproducing apparatus that records or reproduces information on a recording medium on which information is recorded, and includes first reading means for reading the identification information according to a recording form of the identification information, and recorded information by the read identification information. Encryption means for encrypting the recording information, recording means for recording the encrypted recording information in a recording area of the recording medium, and the identification information is recorded in an area to be read prior to the start of the recording or reproducing operation. A discriminating unit for discriminating whether or not there is a second reading unit that reads the area in the same manner as an existing recording / reproducing apparatus, and the discriminating unit. When the identification information is determined to not recorded, and having a switching means for switching to read by the area the second reading means.
[0026]
According to a second aspect of the present invention, in the recording / reproducing apparatus according to the first aspect, when it is determined that the identification information is not recorded by the determining means, the information is recorded on a recording medium without being encrypted by the encrypting means. It is characterized by recording information.
[0027]
According to a third aspect of the present invention, there is provided the recording / reproducing apparatus according to the second or third aspect, wherein the recording information is read from an area where the recording information is recorded, and the first reading means reads the recorded information. And a decrypting unit for decrypting the recording information read from the third reading unit by the identification information.
[0035]
According to the invention described in the above-mentioned claims, the identification information of the recording medium or other information is read in the area that is read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation. Therefore, even if the recording medium is recorded / reproduced by an existing recording / reproducing apparatus, the disc is ejected as a disc error, for example, prior to the recording / reproducing operation. An inconvenient recording / reproducing operation is not executed.
[0037]
The features of the present invention will become more apparent from the following description of embodiments.
[0038]
However, the following embodiment is merely one embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited to that described in the following embodiment. Absent.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0040]
First, FIG. 1 shows the structure of an MD disk according to the embodiment. As shown in the figure, in the MD disc, a media ID area is arranged in the TOC area of the existing MD shown in FIG. 9, and a TOC area is arranged on the outer peripheral side thereof. The configurations of the TOC area, UTOC area, and recordable area are the same as those of the existing MD shown in FIG.
[0041]
In the media ID area, grooves are formed radially from the center of the disc, and the media ID is recorded by the width of the grooves and the width between the grooves. Each groove is formed by burning the film structure of the TOC region with a high-power laser. Further, the portion between the grooves has a film structure similar to the film structure of the TOC region (part other than the prepit). Each groove is formed such that the front edge and the rear edge when viewed in the circumferential direction are in the radial direction of the disk. Therefore, each groove is wider on the outer peripheral side than on the inner peripheral side.
[0042]
An MD disc having such a structure is built in an MD cartridge, similar to an existing MD. The MD cartridge has a hole indicating that the built-in MD disk is different from the existing MD disk. Other configurations and external dimensions are the same as those of the existing MD cartridge.
[0043]
The media ID may be recorded with the width between the grooves being constant and only the width of the groove being variable. Conversely, the media ID may be recorded with the width of the grooves being constant and only the width between the grooves being variable.
[0044]
FIG. 2 shows a configuration of an MD apparatus that records / reproduces information with respect to the MD according to the above embodiment (hereinafter referred to as “copyright protection MD”).
[0045]
The MD device is different from the existing MD device shown in FIG. 10 in the configuration of the encoder 21 and the decoder 22. In addition, a media ID detection circuit 23, a hole detection circuit 24, and a controller 25 are newly added.
[0046]
If the MD mounted on the apparatus is a copyright protection MD, the encoder 21 encrypts the recording information based on the media ID of the MD and then executes ECC encoding processing. If the mounted MD is the existing MD shown in FIG. 9, only the ECC process is executed without encrypting the recording data.
[0047]
FIG. 3 shows the configuration of the encoder 21. The encoder 21 includes an ECC encoding circuit 211, selectors 212 and 214, and an encryption circuit 213.
[0048]
The encryption circuit 213 encrypts the recording data based on the media ID read from the MD disk as will be described later. As the encryption method, various known methods such as convolution processing using a media ID can be used. The selectors 212 and 214 selectively switch the transmission path according to select data from the controller 25. That is, when the installed MD is a copyright protection MD, the transmission path on the encryption circuit 213 side is selected, and when the mounted MD is an existing MD, the other transmission path is selected. To do.
[0049]
Returning to FIG. 2, when the mounted MD is a copyright protection MD, the decoder 22 performs ECC decoding processing and then decrypts the data based on the media ID of the MD. If the performed MD is an existing MD, the ECC decoded data is output to the reproduction circuit 12 as it is.
[0050]
FIG. 4 shows the configuration of the decoder 22. The decoder 22 includes an ECC decoding circuit 221, selectors 222 and 224, and a decryption circuit 223.
[0051]
The decryption circuit 223 decrypts the read data based on the media ID read from the MD disk as described later. The selectors 222 and 224 selectively switch the transmission path according to select data from the controller 25. That is, when the installed MD is a copyright protection MD, the transmission path on the side of the decryption circuit 223 is selected, and when the mounted MD is an existing MD, the transmission path on the other side is selected. .
[0052]
Returning to FIG. 2, the media ID detection circuit 23 reproduces the media ID data based on the media ID signal from the reproduction signal amplification circuit 8 and outputs it to the controller 25. The hole detection circuit 24 detects the medium identification hole formed in the MD cartridge by a photocoupler or a mechanical switch, and outputs the detection result to the controller 25. The controller 25 determines whether the mounted MD is the copyright protection MD shown in FIG. 1 or the existing MD shown in FIG. 9 according to the detection result from the hole detection circuit 24. The select data and the media ID data are supplied to the encoder 21 and the decoder 22 according to the determination result.
[0053]
FIG. 5 shows a configuration example of the photodetector 72 and the reproduction signal amplifier circuit 8.
[0054]
The photodetector 72 includes six detection areas A, B, C, D, E, and F. Here, DR1 in the figure indicates the disk track direction, and DR2 indicates the disk tracking direction. The configuration example of FIG. 5 shows a configuration example when a tracking error signal and a focus error signal are generated by the one-beam push-pull method and the astigmatism method. The configuration of the optical system for realizing the one-beam push-pull method and the astigmatism method is well known in the art and will not be described here.
[0055]
When in the on-focus and on-track states, the reflected beam from the disk is evenly applied to areas A, B, C, and D of the photodetector 72 in a state of being divided into four. In addition, the region E and the region F are each irradiated with a reflected beam whose optical path is divided into two beams having different polarization planes by a Wollaston prism (not shown) in the optical pickup 7.
[0056]
The reproduction signal amplifier circuit 8 includes adder circuits 81, 83, 84, 85, 86 and subtractor circuits 82, 87, 88.
[0057]
The reproduction RF signal when the recordable area (magneto-optical recording) is scanned is generated by subtracting the output signals of the areas E and F by the subtracting circuit 82. The reproduction RF signal when the TOC area (pre-pit) is scanned is generated by adding the output signals of the areas E and F by the adding circuit 81. Further, the reproduction RF signal when the media ID area (radial groove) is scanned is generated by adding the output signals of the areas E and F by the adding circuit 81 as in the case of scanning the TOC area.
[0058]
The tracking error signal is obtained by adding a signal obtained by adding the output signals from the areas A and B by the adding circuit 83 and a signal obtained by adding the output signals from the areas C and D by the adding circuit 84 by the subtracting circuit 87. Generated by subtraction. The focus error signal is obtained by adding a signal obtained by adding the output signals from the areas A and D by the adding circuit 85 and a signal obtained by adding the output signals from the areas B and C by the adding circuit 86. It is generated by subtracting.
[0059]
FIG. 6 shows a flowchart of processing executed in the MD device prior to the recording / reproducing operation.
[0060]
When the MD cartridge is mounted on the MD device (S101), it is first determined whether or not the media identification hole is detected by the hole detection circuit 24 (S102). Here, if it is determined that a hole has been detected, the mounted MD is recognized as a copyright protection MD, and the pickup 7 is moved to the innermost circumferential position of the disc, that is, the media ID area (S103). When the focus trial is executed and the focus is adjusted well (S104), the disk rotation speed is set to the medium ID reading speed (the angular speed is constant) (S105), and the media ID is not applied without performing the tracking adjustment. An area read is performed. Thus, the media ID detection circuit 23 reproduces the media ID data and stores it in the memory in the controller 25 (S106).
[0061]
Thereafter, the pickup 7 is moved to the TOC area (S107), and tracking adjustment is executed (S108). When the tracking adjustment is made well, the reading and reproduction of the TOC data is executed. The reproduced TOC data is stored in the memory in the controller 25 (S109). Thereafter, when a recording or reproduction instruction is input from the user, a recording or reproduction operation is executed according to the instruction (S110).
[0062]
If it is determined in S102 that no hole has been detected, the mounted MD is recognized as an existing MD, and the pickup 7 is moved to the innermost circumferential position of the disk, that is, the TOC area (S112). Then, when a focus trial is executed and the focus is adjusted well (S113), tracking adjustment is executed (S108). When the tracking adjustment is made well, the reading and reproduction of the TOC data is executed. The reproduced TOC data is stored in the memory in the controller 25 (S109).
[0063]
In the above, if any of the focus adjustment (S104, S113) or the tracking adjustment (S108) results in an error, the MD cartridge is ejected, and the process ends (S111). Further, after the TOC information is stored in the controller 25, the reproduction of the UTOC data is continued. The reproduced UTOC data is stored in a memory in the controller 25.
[0064]
FIG. 7 shows a process flowchart during the reproduction operation.
[0065]
When a reproduction command for a predetermined song is input, the pickup 7 is moved to the start position of the song and a reading operation is started (S201). With this reading operation, a reproduction RF signal is output from the reproduction signal amplifier circuit 8 and supplied to the decoding circuit 10 via the waveform shaping circuit 9. The decoding circuit 10 sequentially decodes the received RF signal, and generates and outputs read data (S202).
[0066]
In the process of FIG. 6, when it is determined that the MD mounted on the MD device is a copyright protection MD (YES in S203), the decoder 22 performs a deencrypt process on the read data from the decryption circuit 10. (Decryption processing) is executed (S204), and ECC decoding processing is further performed on the decrypted data and supplied to the reproducing circuit 12 (S205). The reproduction circuit 12 performs processing such as DA conversion on the received reproduction data and supplies it to the speaker. Thereby, the music designated by the user is output from the speaker.
[0067]
On the other hand, when it is determined in the process of FIG. 6 that the MD mounted on the MD device is an existing MD (NO in S203), the decoder 22 performs ECC on the read data from the decoding circuit 10. Only the decoding process is executed and supplied to the reproduction circuit 12 (S205). Thereby, the music of the existing MD recorded in an unencrypted state is reproduced and output.
[0068]
This reproduction operation is executed until the reproduction of the user-designated music is completed (S206). When the reproduction of the designated music is completed, the MD device is set to the standby mode until the next reproduction command or recording command or the MD is ejected.
[0069]
FIG. 8 shows a process flowchart during the recording operation.
[0070]
When a recording command is input to the MD device, the UTOC data stored in the controller 25 is referred to, and the leading address of the free area is acquired. Then, the pickup 7 is moved to the position of the head address (S301), and the recording data writing process is sequentially executed.
[0071]
In the processing of FIG. 6, when it is determined that the MD mounted on the MD device is a copyright protection MD (YES in S302), the encoder 21 performs ECC encoding processing on the recording data, Further, an encryption process (encryption process) is executed (S303), and this is supplied to the modulation circuit 2. The modulation circuit 2 performs modulation processing on the received recording data (S304), and supplies this to the drive signal generation circuit 3. As a result, the recording data is sequentially recorded in the free area of the MD disk in an encrypted state (S305).
[0072]
On the other hand, if it is determined in the process of FIG. 6 that the MD mounted on the MD device is not a copyright protection MD (NO in S302), the encoder 21 performs only the ECC encoding process on the recording data. This is supplied to the modulation circuit 2 (S307). The modulation circuit 2 performs modulation processing on the received recording data (S304), and supplies this to the drive signal generation circuit 3. As a result, the recording data is sequentially recorded in the free area of the MD disk in a state where the recording data is not encrypted (S305).
[0073]
Such a recording operation is executed until the recording data is completed (S306). When the reproduction of the designated music is completed, the MD device is set to the standby mode until the next recording command or reproduction command or MD is ejected.
[0074]
Next, the operation when the copyright protection MD is mounted on the existing MD apparatus shown in FIG. 10 will be described with reference to FIG.
[0075]
When the copyright protection MD is attached to the MD device (S401), the pickup 7 is moved to the innermost peripheral position, that is, the media ID area (S402). Thereafter, focus trial (S403) and tracking adjustment (S404) are executed.
[0076]
As described above, since the media ID area of the copyright protection MD has the same film structure as that of the existing MD TOC area, the focus trial determination in S403 is normally determined to be good. However, no track-like pre-pits are formed in the media ID area, and instead, radial grooves are formed, so that tracking is not applied. Therefore, the tracking adjustment determination in S404 is always an error. It is determined. As a result, the copyright protection MD is ejected from the MD device before the recording / playback operation is started. Therefore, inconvenient recording / reproduction with respect to the MD is not executed.
[0077]
As described above, according to the copyright protection MD and the MD apparatus according to the present embodiment, the media ID unique to the MD disc is recorded in advance in the groove shape, and the recorded data is encrypted with this media ID, and then the MD disc. Since the data is recorded above, even if the recording data is copied to another MD together with the UTOC data, the recording data after copying cannot be decrypted. Therefore, compared with the limitation by the conventional SCMS, The prohibition of digital copy can be made more thorough.
[0078]
In addition, by setting the recording position of the media ID as the TOC area that is read prior to the recording / reproducing operation by the existing MD device, when the copyright protection MD according to the embodiment is attached to the existing MD, The MD is surely ejected in the TOC reading operation before the recording / reproducing operation, and therefore it is possible to avoid the inconvenient recording / reproducing of the copyright protection MD in the existing MD device. .
[0079]
Thus, according to the above-described embodiment, thorough copyright protection and inconvenience between the existing MD device can be solved at the same time.
[0080]
Needless to say, the present invention is not limited to the above-described embodiment, and various other modifications are possible.
[0081]
For example, in the above embodiment, a radial groove is formed in the media ID area so that the media ID is recorded. However, the media ID may be recorded in other forms. As an example, the reflectivity of the media ID area may be set lower than the reflectivity of the TOC area of the existing MD, and the media ID may be recorded in the pre-pit here. With this configuration, the existing MD device cannot reproduce the media ID area due to insufficient reflected light intensity, and as a result, the MD is ejected. In the MD device for reading the media ID from the MD, it is necessary to adjust the gain when reading the media ID area and generate a reproduction RF signal with sufficient strength.
[0082]
The data recorded in the media ID area may be recorded not only with the media ID but also with other data. In the above embodiment, copyright protection is taken into consideration, but when the embodiment is configured for purposes other than copyright protection, an area other than the media ID is set in the area corresponding to the media ID area. This information should be recorded. In this case, if the information is recorded in the radial grooves as described above, the existing MD device ejects the MD before moving to the recording / reproducing operation. Appropriate recording / playback can be avoided.
[0083]
In the above embodiment, the MD has been described as an example. However, the present invention is not limited to the MD but can be applied to other recording media such as a DVD and a CD-R. Of course, the data to be recorded is not limited to audio data, and other data such as video and still images can be used.
[0084]
The embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea of the present invention.
[0085]
【The invention's effect】
According to the present invention, since the existing recording / reproducing apparatus records predetermined information in a form that causes a reading error in the area read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation, While realizing special control for copyright protection, etc. by adding the predetermined information, inconvenient recording / playback operation by the existing device due to the addition of the information is performed at the time of reading operation prior to the recording / playback operation This can be avoided by the ejection process.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an MD disk according to an embodiment
FIG. 2 is a diagram showing a configuration of an MD apparatus according to an embodiment
FIG. 3 is a diagram showing a configuration of an encoder according to an embodiment
FIG. 4 is a diagram showing a configuration of a decoder according to an embodiment
FIG. 5 is a diagram showing a configuration of a photodetector and a reproduction signal amplifier circuit according to the embodiment.
FIG. 6 is a flowchart showing processing before the recording / reproducing operation according to the embodiment;
FIG. 7 is a flowchart showing a reproduction operation according to the embodiment.
FIG. 8 is a flowchart showing a recording operation according to the embodiment.
FIG. 9 is a diagram showing the configuration of an existing MD disk
FIG. 10 is a diagram showing the configuration of an existing MD device
FIG. 11 is a process flowchart before a recording / reproducing operation in an existing MD apparatus.
[Explanation of symbols]
2 Modulation circuit
3 Drive signal generation circuit
4 Magnetic head drive circuit
5 Magnetic head
6 Laser drive circuit
7 Pickup
8 Reproduction signal amplification circuit
9 Waveform shaping circuit
10 Decoding circuit
12 Playback circuit
21 Encoder
22 Decoder
23 Media ID detection circuit
24 Hall detection circuit
25 controller

Claims (3)

A recording medium in which information for identifying the recording medium is recorded in an area that is read by the existing recording / reproducing apparatus prior to the start of the recording or reproducing operation in a form that causes a reading error in the existing recording / reproducing apparatus And a recording / reproducing apparatus for recording or reproducing information,
First reading means for reading the identification information according to a recording form of the identification information;
An encryption means for encrypting the recorded information with the read identification information;
Recording means for recording the encrypted recording information in a recording area of the recording medium;
Determining means for determining whether or not the identification information is recorded in an area to be read prior to the start of the recording or reproducing operation;
Second reading means for reading the area in the same manner as an existing recording / reproducing apparatus;
When it is determined by the determination means that the identification information is not recorded, switching means for switching the area to be read by the second reading means;
A recording / reproducing apparatus comprising: In claim 1,
When it is determined that the identification information is not recorded by the determination unit, the recording information is recorded on a recording medium without being encrypted by the encryption unit,
And a recording / reproducing apparatus. In claim 1 or 2,
Third reading means for reading record information from an area where the record information is recorded;
Decryption means for decrypting the recording information read from the third reading means by the identification information read by the first reading means;
And a recording / reproducing apparatus.

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