JP2001057021A - Digital data recording and reproducing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital data recording and reproducing system capable of preventing an unauthorized copy including an illegal entirety copy. SOLUTION: An inherent modulation and demodulation specifying code specified in the modulating and demodulating methods of data is unrewritably recorded on a recording medium 1 and, at the time of reproducing, recorded information are reproduced from an RF signal which is obtained by signal processing the output signal of an optical pickup 6 in an RF signal output circuit 7 by a programmable descrambling circuit 9 and a programmable data decoding circuit 10 whose circuits are rewritten with the modulation and demodulation specifying code read out by a specific code extracting circuit 8. Even when the recorded information are recorded by sending a modulation and demodulation characteristic code to the recording medium having another modulation and demodulation characteristic code and the reproducing of the recorded information is preformed, since the reproducing is performed by a modulation and demodulation characteristic code different from the modulation and demodulation characteristic code, the partinent recorded information can not be reproduced. Thus, even when the whole recorded information in an original recording medium is unauthorizedly copied, the modulation and demodulation characteristic code is unrewritable and the recorded information are not reproduced from the recording medium of the entirety copy and then the protecting of the recorded information in the original recording medium becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data recording / reproducing system having a function of preventing illegal copying.

[0002]

2. Description of the Related Art In a digital data recording / reproducing system, a CD-R (Compact Disk) is used as a recording medium.
-Recordable; writable recordable compact disc), DVD-R (DigitalVideoDis)
Digital recording / playback recording media such as k-Recordable (writable / recordable digital video desk) have been developed. Along with this, means for preventing illegal copying of copyrighted recording information recorded on a recording medium is required. In order to solve this problem, in the main data area of the recording medium, a prohibition code that prohibits digital copy or prohibits stepwise generation copy is recorded, and the digital signal recording device detects this prohibition copy. In addition, a method of prohibiting copy recording is adopted.

However, in this method, a reproduced digital video signal is DA converted once into an analog video signal, and the obtained analog signal is recorded in an analog manner.
When an analog signal obtained by DA conversion is again converted to a digital video signal and digitally recorded, there is a problem that illegal copying cannot be prevented.

[0004]

In order to cope with the above-mentioned blind spot for preventing illegal copying, Japanese Patent Laid-Open No. 9-98381 discloses a technique of performing a conversion process on a reproduction signal output from a reproduction apparatus, and performing the conversion processing. Is recorded as recording control information in at least one of a reproduction mode control signal area for controlling the mode of the reproduction state of the recording medium and each header section of the sectorized digital data. A method is disclosed in which the recording control information is read to resolve the conversion processing applied to the reproduction signal to obtain the reproduction signal.

[0005] However, even in the method disclosed in Japanese Patent Application Laid-Open No. 9-98381, if a so-called whole illegal copy in which all the recorded information on the recording medium is illegally copied is performed, the illegally copied recording medium is not used. Thus, the same reproduction as that of the original recording medium becomes possible. This is shown in FIG.
With reference to, the motor 5 is rotatable about an axis, and the feed unit 17 is capable of being moved in the radial direction of the recording medium 1 with respect to the recording medium 1 on which original recording information is written. A pickup 6 is disposed, and on the other hand, a CD-R, a DVD-R, etc., which is rotatable about an axis by a motor 5B and tries to illegally record original recording information written on the recording medium 1. A write-once or rewritable recording medium 1B and a pickup 6B that can be transported in the radial direction of the recording medium 1B by a feed unit 17B are provided. Then, while the motors 5 and 5B are rotationally driven in a synchronous state, and the feed units 17 and 17B are synchronously transported and driven in the radial direction of the recording medium, the information read from the recording medium 1 is written to the recording medium 1B. By doing
The entirety of the original recording information is illegally copied to the recording medium 1B. When the entire illegal copy is performed in this manner, all the recording information including the recording control information for solving the conversion process is recorded on the recording medium 1B, so that the original recording medium 1 is completely identical to the original recording medium 1. Reproduction of the recorded information becomes possible.

The present invention has been made in view of the above-mentioned situation of illegal copying of recorded information having a copyright, and an object of the present invention is to completely prevent illegal copying including an unauthorized whole copy. An object of the present invention is to provide a possible digital data recording / reproducing system.

[0007]

According to a first aspect of the present invention, there is provided an apparatus for modulating / demodulating specific data for specifying a modulating / demodulating operation of recording data in a data recording / reproducing area. Recording medium, read the modulation and demodulation specific data, based on the modulation and demodulation specific data,
A recording / reproducing device for performing a recording / reproducing operation on the data recording / reproducing area.

According to such means, even if the modulation / demodulation specific data is skipped and the recorded information is illegally copied onto a recording medium set to different modulation / demodulation specific data, the recorded information is not reproduced, and the so-called recorded information is not reproduced. Even if the whole illegal copy is attempted, the modulation / demodulation specific data unique to the recording medium will not be illegally copied, the recording / reproducing device will not read the unique modulation / demodulation specific data, and the recording / reproducing device will not completely read the illegal copy of the recording medium. Prevention takes place.

According to a second aspect of the present invention, in the first aspect, the unique modulation / demodulation specific data is unique scramble data for the data recording / reproducing area or data specifying a data conversion method. It is a feature. According to such a means, the unique scrambling data for the data recording / reproducing area of the recording medium or the data specifying the data conversion method is written in the recording medium as the unique modulation / demodulation specific data in a non-rewritable manner. The operation according to the first aspect of the present invention is realized.

According to a third aspect of the present invention, in the first aspect of the present invention, the recording / reproducing apparatus includes a scramble / descramble circuit that operates in response to the specific modulation / demodulation specific data, and a data conversion / demodulation circuit. And characterized in that: According to such means, the scrambling / reproducing of the recording / reproducing apparatus is performed based on the modulation / demodulation specific data unique to the recording medium read by the recording / reproducing apparatus.
The descrambling circuit and the data conversion / demodulation circuit perform the recording / reproducing operation on the data recording / reproducing area of the recording medium, so that the operation according to the first aspect of the present invention is realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.
This will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a reproducing system of the recording / reproducing apparatus according to the present embodiment.
FIG. 2 is a block diagram showing a configuration of a recording system of the recording / reproducing apparatus of the present embodiment, FIG. 3 is an explanatory diagram showing a configuration of a recording medium of the present embodiment, and FIG. 4 shows an operation of the present embodiment. FIG. 5 is a flowchart for explaining the illegal copy preventing operation according to the present embodiment.

In the reproducing system of the recording / reproducing apparatus according to the present embodiment, as shown in FIG. 1, an optical disk 1 on which recording information is written is rotatable about a shaft by a motor 5 and is rotatable.
On the other hand, an optical pickup 6 which is transferred in a radial direction of the optical disk 1 by a feed unit (not shown), projects laser light on the recording medium 1 and receives reflected light from the recording medium 1 is provided. . An output terminal of the optical pickup 6 is provided with an RF signal output circuit 7 that performs signal processing such as waveform equalization processing and waveform shaping processing on the output signal from the optical pickup 6 and converts the signal into digital data and outputs the digital data. It is connected.

The output terminal of this RF signal output circuit 7
A modulation / demodulation specific code extraction circuit 8 for extracting a modulation / demodulation specific code recorded on the recording medium 1 from an RF signal, and a programmable descramble circuit for rewriting and setting a descrambling circuit in accordance with the content of the extracted modulation / demodulation specific code. And a modulation / demodulation specific code extraction circuit 8
Output terminal of the programmable descramble circuit 9
Is connected to the control terminal. An output terminal of the programmable descramble circuit 9 is connected to a programmable data demodulation circuit 10 for rewriting and setting the data demodulation circuit in accordance with the content of the extracted modulation / demodulation specific code. Output terminal
It is connected to the control terminal of the programmable data demodulation circuit 10.

Further, in the recording system of the recording / reproducing apparatus according to the present embodiment, as shown in FIG. On the other hand, an optical pickup 6 that is transferred in a radial direction of the optical disk 1 by a feed unit (not shown), projects laser light on the recording medium 1, and receives reflected light from the recording medium 1 is provided. An output terminal of the optical pickup 6 is connected to an RF signal output circuit 7 that performs signal processing such as waveform equalization processing and waveform shaping processing on an output signal from the optical pickup 6 and converts the signal into digital data and outputs the digital data. Have been.

The output terminal of this RF signal output circuit 7
An input terminal of a modulation / demodulation specific code extraction circuit 8 for extracting a modulation / demodulation specific code recorded on the recording medium 1 from the RF signal is connected, and an output terminal of the modulation / demodulation specific code extraction circuit 8 corresponds to the content of the modulation / demodulation specific code. Is connected to the control terminal of the programmable data conversion circuit 12 for rewriting and setting the data conversion circuit, and the output terminal of the programmable data conversion circuit 12 is connected to the programmable terminal for rewriting and setting the scramble circuit in accordance with the content of the modulation / demodulation specific code. It is connected to the input terminal of the scramble circuit 11. The output terminal of the modulation / demodulation specific code extraction circuit 8 is connected to the control terminal of the programmable scramble circuit 11, and the output terminal of the programmable scramble circuit 11 is connected to the input terminal of the optical pickup 6.

According to the recording / reproducing apparatus of this embodiment,
As shown in FIG. 3, the recording medium 1 on which recorded information is reproduced has a specific code recording area 2 provided in a lead-in area on the center side of the recording medium 1. A data recording area 3 is provided outside the recording medium 1 in the radial direction, and recording information to be copyrighted is recorded in this data area. In the specific code recording area 2, a modulation / demodulation specific code unique to each of the recording media 1 including information for specifying the modulation / demodulation method of the data recording area 3 is recorded in a non-rewritable manner by a method common to all recording media. Have been. Although this modulation / demodulation specific code is ideally different for all recording media, it is actually difficult to realize an ideal state, and as many recording media as possible with different types of modulation / demodulation specific codes are available on the market. By providing this, the piracy prevention effect is enhanced.

The modulation / demodulation specifying code may be a code for specifying one of several types of scramble methods prepared, for example, recording and reproducing raw data such as 8-16 modulation used in DVD systems. A code specifying one of a number of conversion methods for converting to a code suitable for the code may be used, or a combination of these may be used. The more combinations, the better the effect of suppressing illegal copying is improved. Also,
Based on the modulation / demodulation specifying code, the recording / reproducing apparatus performs the optical pickup 6 from the projection of the laser beam onto the recording medium 1 by the optical pickup 6 to the reading of the recording information, or from the input of the recording information to the recording / reproducing apparatus. 6, the entire data processing up to the recording of the information on the recording medium 1 is executed.

The operation of the embodiment will be described. When the recording information having the copyright is recorded on the original recording medium 1 based on the modulation / demodulation specific code a, the modulation / demodulation specific code is skipped to the recording medium set to the modulation / demodulation specific code b. When the recording information having the copyright recorded on the recording medium 1 is illegally copied, the recording / reproducing apparatus performs the recording / reproducing of the data recording area based on the modulation / demodulation specific code b of the recording medium on which the illegal copying has been performed. Since the data is demodulated, the record information copied illegally is not reproduced, and the record information of the original recording medium 1 is protected.
However, when the modulation / demodulation specific code is accidentally skipped to the recording medium set to the modulation / demodulation specific code a and the copyrighted recording information recorded on the recording medium 1 is illegally copied, the illegal copy is performed. The recorded information is reproduced, but since the combinations of the modulation / demodulation specific codes on the recording medium are diversified, the probability of such a situation occurring is extremely small, and the recorded information on the original recording medium 1 is sufficiently protected.

If the entire data is illegally copied to the recording medium set to the modulation / demodulation specific code b, the copy operation destroys the modulation / demodulation specific code b. Since the code a is recorded in a non-rewritable manner, the modulation / demodulation code a is not recorded on the recording medium on which the unauthorized copying has been performed. Therefore,
In the recording / reproducing device, the modulation / demodulation code a cannot be taken in, the recorded information illegally copied is not reproduced, and the recorded information on the original recording medium 1 is protected.

The operation of the present embodiment will be described with reference to the flow chart of FIG. 4, focusing on the case of reproducing the copyrighted recording information recorded on the recording medium 1 set in the modulation / demodulation code a. To describe, in step S1, the RF signal output circuit 7 performs signal processing such as waveform equalization processing and waveform shaping processing on the output signal from the optical pickup 6 and converts the RF signal into digital data. The modulation / demodulation specific code a is read by the specific code extraction circuit 8. Next, proceeding to step S2,
The specific code extraction circuit 8 determines whether or not the modulation / demodulation specific code a has been captured. If the specific code extraction circuit 8 determines that the modulation / demodulation specific code a has been captured, the process proceeds to step S3. The descrambling circuit 9 rewrites the descrambling circuit based on the modulation / demodulation specific code a, and the programmable data demodulation circuit 10 rewrites the data demodulation circuit in accordance with the content of the modulation / demodulation specific code a. Then
Proceeding to step S4, the recorded information having the copyright is reproduced from the recording medium 1 by the rewritten descramble circuit and data demodulation circuit. Then, step S5
Then, it is determined whether the data recording / reproduction has been completed. If it is determined that the data recording / reproduction has been completed, the processing is terminated.

On the other hand, if it is determined in step S2 that the modulation / demodulation specific code is not fetched, this means that the used recording medium uses the modulation / demodulation specific code a Is read and illegally copied, or the recorded information of the original recording medium 1 is illegally copied as a whole, and the operation ends immediately.

Further, in the present embodiment, although the modulation / demodulation characteristic code in which the original recording information is recorded is recorded on the recording medium a, there is a very low possibility, for example, of the copyrighted recording information. When a recording medium with the same modulation / demodulation characteristic code is selected, illegal copying is performed on this recording medium, and recording of recorded information is illegally performed on another recording medium based on a reproduction signal from this recording medium. Will be described. In this case, as shown in FIG. 2, signal processing such as waveform equalization processing and waveform shaping processing is performed on the output signal from the optical pickup 6 by the RF signal output circuit 7, and further converted to digital data. Converted to R
An RF signal is output from the F signal output circuit 7, and from the RF signal, a modulation / demodulation specific code other than a of the recording medium on which the recording information is to be illegally recorded is extracted by the modulation / demodulation specific code extraction circuit 8. Then, in the programmable data conversion circuit 12, the conversion circuit is rewritten based on the modulation / demodulation code extracted by the modulation / demodulation specific code extraction circuit 8, and the programmable scramble circuit 11 converts the conversion code into the modulation / demodulation code extracted by the modulation / demodulation specific code extraction circuit 8. Based on this, the scramble circuit is rewritten.

Therefore, in this case, the programmable
The recording information of the original recording medium that has been illegally reproduced is input to the data conversion circuit 12, but the programmable data conversion circuit 12 performs a data conversion operation using a code other than the modulation / demodulation specific code a and performs programmable scrambling. Since the circuit 11 performs the scrambling operation using a code other than the modulation / demodulation specific code a, the illegally reproduced recording information is not illegally written on the recording medium.

As described above, in the present embodiment, the recording information to be copyrighted is recorded in the data recording area 3 outside the specific code recording area 2 in the lead-in area of the recording medium 1, and the specific code recording area is recorded. 2, a modulation / demodulation specifying code unique to the recording medium 1 including information for specifying the modulation / demodulation method of the data recording area 3 is recorded in a non-rewritable manner. When the recorded information is reproduced, the recording / reproducing apparatus shown in FIG. In the reproducing system, the output signal from the optical pickup 6
Signal processing such as waveform equalization processing and waveform shaping processing is performed by the F signal output circuit 7, and the modulation / demodulation specific code is read by the specific code extraction circuit 8 from the RF signal converted into digital data. Then, based on the modulation / demodulation characteristic code read and taken in by the specific code extracting circuit 8, the descrambling circuit is rewritten by the programmable descrambling circuit 9, and the data demodulating circuit is sent by the programmable data demodulating circuit 10. Rewritten.

As described above, in the present embodiment, based on the modulation / demodulation characteristic code of the recording medium to be reproduced,
The recorded information in the data recording area 3 of the recording medium is reproduced by the rewritable descramble circuit and the data demodulation circuit, so that the modulation / demodulation characteristic code is skipped to another recording medium in which another modulation / demodulation characteristic code is set, and Even if the recording information having the right is recorded and the reproduction is attempted, the reproducing operation is performed with another modulation / demodulation characteristic code different from the modulation / demodulation characteristic code of the original recording medium, and the recording information of the original recording medium is reproduced. Copyright is protected.
Further, even if the recording information of the original recording medium 1 is illegally copied, including the modulation / demodulation characteristic code, the modulation / demodulation characteristic code is recorded in a non-rewritable manner. The copyright of the recorded information on the original recording medium is protected.

Although the possibility of occurrence is extremely low, a recording medium of the modulation / demodulation characteristic code on which the original recording information is recorded is selected, and the copyright of the copyright recorded on the original recording medium is selected on this recording medium. If an illegal whole copy of certain recorded information is made and the recording information is illegally recorded on another recording medium based on the reproduction signal from the recording medium on which the illegal copy was made, the programmable data conversion The recording information of the original recording medium that has been illegally reproduced is input to the circuit 12. However, the specific code extraction circuit 8 detects a different modulation / demodulation specific code of the recording medium on which illegal copying is to be performed, and based on this code, the programmable data conversion circuit 12 performs a data conversion operation, and the programmable scramble circuit At 11, the scramble operation is performed, so that the recording information illegally reproduced is not written on another recording medium.
The copyright of the recorded information on the original recording medium is protected.

Although the embodiment has been described with reference to the case where the modulation / demodulation specific code is recorded in the lead-in area of the recording medium, the present invention is not limited to the embodiment.
The modulation / demodulation specific code can be recorded outside the data recording area of the recording medium.

[0028]

According to the first aspect of the present invention, the modulation / demodulation specific data unique to the recording medium for specifying the modulation / demodulation operation of the recording data in the data recording / reproducing area is recorded on the recording medium in a non-rewritable manner. The modulation / demodulation specific data recorded on the recording medium is read by the recording / reproducing apparatus, and the recording / reproduction is performed based on the read modulation / demodulation specific data.
Since the reproducing apparatus performs the recording / reproducing operation on the data recording / reproducing area of the recording medium, even if the modulation / demodulation specific data is skipped to the recording medium set to different modulation / demodulation specific data and the recording information is illegally copied, the recording / reproducing operation is not performed. The information is not reproduced, and even if so-called illegal copying is attempted, the modulation / demodulation specific data unique to the recording medium is not illegally copied, and the recording / reproducing device reads the unique modulation / demodulation specific data. It is not performed, so that unauthorized copying of the recording medium can be completely prevented.

According to the second aspect of the present invention, as the modulation / demodulation specific data specific to the recording medium, the specific scramble data for the data recording / reproducing area of the recording medium, or the data specifying the data conversion method, cannot be rewritten. By being written, it is possible to realize the effect obtained by the first aspect of the present invention.

According to the third aspect of the present invention, the scramble / descramble circuit and the data conversion / demodulation circuit of the recording / reproducing apparatus are based on the modulation / demodulation specific data unique to the recording medium read by the recording / reproducing apparatus. By performing the recording / reproducing operation on the data recording / reproducing area of the recording medium, it is possible to realize the effect obtained by the first aspect of the present invention.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a reproducing system of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a recording system of the recording / reproducing apparatus of the embodiment.

FIG. 3 is an explanatory diagram showing a configuration of a recording medium of the embodiment.

FIG. 4 is a flowchart showing an operation of the embodiment.

FIG. 5 is an explanatory diagram of an unauthorized copy preventing operation according to the embodiment;

FIG. 6 is an explanatory diagram of an illegal copy in a conventional digital data recording / reproducing system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical disc 2 specific code recording area 3 data recording area 5 motor 6 optical pickup 7 RF signal output circuit 8 specific code extraction circuit 9 descramble circuit 10 data demodulation circuit 11 scramble 12 data conversion circuit 15 reproduction system 16 recording system

Claims (3)

[Claims] 1. A recording medium in which specific modulation / demodulation specific data for specifying a modulation / demodulation operation of recording data in a data recording / reproducing area is recorded in a non-rewritable manner; and the modulation / demodulation specific data is read, and based on the modulation / demodulation specific data, A digital data recording / reproducing system comprising: a recording / reproducing device for performing a recording / reproducing operation on the data recording / reproducing area. 2. The method according to claim 1, wherein the specific modulation / demodulation specific data is specific scramble data for the data recording / reproducing area,
2. The digital data recording / reproducing system according to claim 1, wherein the data is data for specifying a data conversion method. 3. The digital recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus includes a scramble / descramble circuit that operates in response to the specific modulation / demodulation specific data, and a data conversion / demodulation circuit. Data recording and playback system.