JP2000215106A - Removable nonvolatile memory, digital information recording device, digital information reproducing device, and digital information recording and reproduction system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the removable nonvolatile memory which can inhibit its internally recorded digital information from being used by illegal copying, the digital information recording device and digital information reproducing device which use it, and the digital information recording and reproduction system which is equipped with them. SOLUTION: In the nonvolatile memory 0, a rewritable area 1b and an unrewritable area 1a are formed, and ID information characteristic of the nonvolatile memory 0 is previously stored in the unwritable area 1a. A digital information recording device 10 ciphers digital information according to the ID information in the unwritable area 1a and then records it in the rewritable area 1b. A digital information reproducing device 20 deciphers the digital information in the writable area 1b according to the ID information in the unwritable area 1a and reproduces it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removable non-volatile memory, a digital information recording device for recording predetermined digital information such as music in the non-volatile memory, and a reproduction of the digital information in the non-volatile memory. The present invention relates to a digital information reproducing apparatus and a digital information recording / reproducing system including the respective apparatuses.

[0002]

2. Description of the Related Art In recent years, when information such as music is recorded on a recording medium, a method of recording not only analog information but also after converting it into digital has become mainstream. As a recording medium used for recording such digital information, for example, DAT (digital audio tape) or MAT
D (mini-disc) is common, but recently,
Since a rotating mechanism is not required for recording / reproducing, the compactness of the recording / reproducing apparatus is relatively easy, and a semiconductor memory which does not cause a sound skip at the time of reproducing has attracted particular attention. For example, Japanese Patent Application Laid-Open Nos. 7-14563 and 10-
Japanese Patent Application Laid-Open No. 111917 proposes an audio information recording / reproducing apparatus using a removable nonvolatile semiconductor memory.

[0003]

However, in the audio information recording / reproducing apparatus described in the above publication, the digital information recorded in the non-volatile memory is copied, or the copied digital information is used in another reproducing apparatus. Since there is no function to prohibit playback, there was a problem in terms of copyright protection. Due to the nature of digital information, it is possible to copy without deterioration in quality. Therefore, it is necessary to prohibit unauthorized copying or use beyond the scope of personal use. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a removable non-volatile memory capable of prohibiting the use of illegally copied digital information recorded therein, and using the same. An object of the present invention is to provide a digital information recording device, a digital information reproducing device, and a digital information recording / reproducing system including them.

[0004]

According to a first aspect of the present invention, there is provided a digital information recording apparatus for recording predetermined digital information, and a digital information recording apparatus for recording the predetermined digital information. A non-removable non-removable memory which is detachably mounted to a digital information reproducing apparatus for reproducing digital information which is provided with a rewritable area and a non-rewritable area; The digital information recorded in the rewritable area by the digital information reproducing apparatus is encrypted by the digital information reproducing apparatus, and the encrypted digital information in the rewritable area is decrypted by the digital information reproducing apparatus. It is configured as a removable nonvolatile memory characterized by recording ID information. To have. According to a second aspect of the present invention, there is provided a digital information recording apparatus for recording predetermined digital information in a removable nonvolatile memory, wherein each of the nonvolatile memories is recorded in advance in a non-rewritable area in the nonvolatile memory. ID information reading means for reading the ID information, encryption means for encrypting the predetermined digital information based on the ID information read by the ID information reading means, and ID information encrypted by the encryption means. Recording means for recording the digital information in a rewritable area in the non-volatile memory. According to a third aspect of the present invention, there is provided a digital information reproducing apparatus for reading and reproducing digital information recorded in a removable nonvolatile memory, wherein each of the previously recorded nonvolatile information is read from a non-rewritable area in the nonvolatile memory. ID information reading means for reading ID information unique to the memory, and digital information reading means for reading predetermined digital information encrypted from the rewritable area in the nonvolatile memory based on the ID information in the non-rewritable area Decryption means for decrypting the digital information read by the digital information reading means on the basis of the ID information read by the ID information reading means; and a digital decryption means for decrypting the digital information by the decryption means. Reproduction means for decoding and outputting information. It is configured as a barrel information reproducing apparatus. Here, a built-in non-volatile memory having a higher speed and / or a larger number of times of rewriting than the removable non-volatile memory is provided. For example, a decoding program used for decoding by the reproducing means is stored in the built-in non-volatile memory. When the decoding process is performed by the reproducing means using the built-in nonvolatile memory after storing the decoding program, for example, the case where the decoding process is performed in a state where the decoding program is stored in the removable nonvolatile memory may be performed. In comparison, the removable nonvolatile memory can be configured at low cost. Further, if the various setting information at power-off is stored in the built-in non-volatile memory, the various setting information can be reproduced in the same state as when the power is turned off when the power is turned on again, thereby improving usability. I do. A fourth invention is a digital information recording / reproducing system simultaneously including the first to third inventions, that is, a detachable nonvolatile memory, and a digital information recording predetermined digital information in the nonvolatile memory. A digital information recording / reproducing system comprising: a recording device; and a digital information reproducing device for reading and reproducing the digital information from the nonvolatile memory in which the digital information is recorded by the digital information recording device. A rewritable area and a non-rewritable area are formed in the non-volatile memory, ID information unique to the non-volatile memory is stored in the non-rewritable area in advance, and the digital information recording device stores the predetermined digital information. To the ID information in the non-rewritable area in the nonvolatile memory. After performing a predetermined encryption process, the digital information is recorded in the rewritable area in the non-volatile memory, and the digital information reproducing apparatus reads the encrypted digital data recorded in the rewritable area in the non-volatile memory. The digital information recording / reproducing system is configured to reproduce information after performing decryption processing based on the ID information in the non-rewritable area in the nonvolatile memory.

[0005]

According to the first to fourth aspects of the present invention, digital information stored in a rewritable area in a removable nonvolatile memory is stored in a unique rewritable area in the nonvolatile memory. Encrypted using ID information,
At the time of reproduction, the digital information stored in the rewritable area is decoded using the ID information in the non-rewritable area. Therefore, if the digital information stored in the rewritable area is illegally copied from another nonvolatile memory, the ID information used for encrypting the digital information and the rewrite in the nonvolatile memory are used. Since the ID information recorded in the unusable area does not match,
It cannot be played correctly. Therefore, copyright infringement due to unauthorized copying of digital information can be prevented.

[0006]

Embodiments and examples of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiments and examples are mere examples embodying the present invention, and do not limit the technical scope of the present invention. FIG. 1 is a block diagram showing a schematic configuration and processing flow of a digital information recording / reproducing system A1 according to an embodiment of the present invention. FIG. 2 is a diagram showing music copied illegally in the digital information recording / reproducing system A1. FIG. 9 is an explanatory diagram illustrating an example of a process when information is to be reproduced. A digital information recording / reproducing system A1 according to the present embodiment embodies the fourth invention, and as shown in FIG. 1, a flash memory 0 on which digital information is recorded, and a digital memory in the flash memory 0. It comprises an information recording device 10 for recording information and an information reproducing device 20 for reproducing digital information recorded in the flash memory 0. here,
The flash memory 0 corresponds to the removable nonvolatile memory according to the first invention, the information recording device 10 corresponds to the second invention,
The information reproducing apparatus 20 is an example in which the third invention is embodied. The digital information to be recorded and reproduced can be various types of music, still images, moving images, news, and the like. Here, music information will be described as an example.

[0007] The flash memory 0 is configured to be detachable from the information recording device 10 and the information reproducing device 20. Further, the storage area of the flash memory 0 has a non-rewritable area 1a in which data cannot be rewritten.
And a rewritable area 1b in which data can be rewritten. A unique ID number (an example of ID information) is recorded in advance in the non-rewritable area 1a, and music information digitized by the information recording device 10 is written in the rewritable area 1b. As a method of recording the ID number in the non-rewritable area 1a, the ID number may be written in a chip manufacturing process, or may be written after production and before shipment.

The information recording apparatus 10 for writing music information to the rewritable area 1b of the flash memory 0 includes an encoding unit 11, an encryption key generation unit 12, and an encryption processing unit 13. Have been. here,
The encryption key generation unit 12 and the encryption processing unit 13
It constitutes D information reading means, encryption means, and recording means. When the flash memory 0 is mounted on the information recording device 10, first, the ID number is read from the non-rewritable area 1a in the flash memory 0 by the encryption key generation unit 12, and based on the ID number. An encryption key is generated. The music information recorded in the flash memory 0 is input from a digital sound source such as a CD, and is compressed by the encoding unit 11. Of course, as the music information, analog music information input via a microphone or the like may be digitally converted inside the information recording device 10. As a method of the compression processing, for example, MPE
GV-4 standard methods such as TwinVQ and AAC can be used. The music information compressed by the encoding unit 11 is sent to the encryption processing unit 13, where encryption processing is performed using the encryption key generated by the encryption key generation unit 12. The encrypted music information is written in the rewritable area 1b in the flash memory 0.

The reproduction of the music information written in the flash memory 0 is performed by a decryption key generation unit 21 and a decryption processing unit 22.
, A decoding unit 23, a D / A conversion unit 24, and an amplifier 2
5 is performed by the information reproducing apparatus 20 including Here, the decryption key generation unit 21 and the decryption processing unit 22 correspond to the ID information reading unit, the digital information reading unit, and the decryption unit by the decoding unit 23, the D
The / A conversion unit 24 and the amplifier 25 constitute a reproducing unit. The decryption key generation unit 21, the decryption processing unit 22, and the decoding unit 23 are, for example, D
Implemented by SP. Alternatively, 21 and 22 can be realized by microcomputers, and 23 can be realized by a DSP. When the flash memory 0 is mounted on the information reproducing apparatus 20, first, the decryption key generation unit 21 reads the ID number from the non-rewritable area 1a in the flash memory 0, and based on the ID number, Decryption key is generated. The decryption processing unit 22 reads out music information from the rewritable area 1b in the flash memory 0, and performs decryption processing using the decryption key generated by the decryption key generation unit 21. . The music information decrypted by the decryption processing unit 22 is subjected to decompression processing (decoding) by the subsequent decoding unit 23, and the D / A conversion unit 24
After the analog conversion, the signal is output through the amplifier 25.

If the music information recorded in the rewritable area 1b in the flash memory 0 is correctly written by the information recording device 10, the music information is used for encrypting the music information. ID number (Fig. 1
3256) matches the ID number recorded in the non-rewritable area 1a in the flash memory 0, so that the information reproducing device 20 normally reproduces the information. However, as shown in FIG. 2, if the music information recorded in the rewritable area 1b in the flash memory 0b is copied from another flash memory 0a, it is used for encrypting the music information. Since the ID number (here, 3256) does not match the ID number (here, 7152) recorded in the non-rewritable area 1a in the flash memory 0, the information reproducing apparatus 20
Is not correctly performed by the decryption processing unit 22 of
Therefore, it becomes impossible to correctly reproduce the music information.

As described above, in the digital information recording / reproducing system A1 according to the present embodiment, the music information stored in the rewritable area 1b in the flash memory 0 is the non-rewritable area 1a in the flash memory 0.
In order to decrypt and reproduce the music information stored in the rewritable area 1b using the ID number in the non-rewritable area 1a at the time of reproduction, If the music information stored in the rewritable area 1b is illegally copied from another flash memory, the ID number used for encrypting the music information and the non-rewritable area in the flash memory 0 Since the ID number recorded in 1a does not match, correct reproduction cannot be performed. Therefore,
Copyright infringement due to unauthorized copying of music information can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a method of a decoding process by a decoding unit 23 of the information reproducing apparatus 20, for example, a decoding program is stored together with music information in a rewritable area 1b in the flash memory 0, and the flash memory 0 is stored. It is conceivable that the decoding program and the parameters are exchanged between the rewritable area 1b and the DSP constituting the decoding unit 23. However, in this method, it is necessary to use the flash memory 0 capable of high-speed reading and writing and having a large number of times of rewriting in order to speed up the processing, and there is a problem that the flash memory 0 becomes expensive. Therefore, in addition to the detachable flash memory 0, the information reproducing apparatus 20 is provided with a built-in non-volatile memory which is high-speed and has a large number of times of rewriting, and stores the decryption program therein. DS constituting the decoding unit 23
If the decryption process is performed while exchanging the decryption program and parameters with the P, the removable flash memory 0 can be inexpensive. In this case, for example, when the compression method is determined to be one, the decoding program can be stored in the built-in nonvolatile memory in advance, but when the compression method is not determined to be one, In other words, the decoding program may be stored together with the music information in the removable flash memory 0, and the decoding program may be read into the built-in nonvolatile memory prior to the decoding process.

Further, various setting information (volume, volume, etc.) when the power of the information reproducing apparatus 20 is turned off is stored in the built-in nonvolatile memory.
(Sound effects, setting information such as the reproduction order, etc.) may be stored. Since the information stored in the built-in nonvolatile memory is retained even when the power is turned off, it becomes possible to reproduce the various setting information in the same state as when the power is turned off when the power is turned on again, thereby improving usability. . Note that the same setting information can be stored in the removable flash memory 0, but in this case, if the flash memory 0 is removed, the setting information cannot be reproduced by the information reproducing apparatus 20. . In addition to the above various setting information, the built-in nonvolatile memory has a power ON / O
Various information (for example, the ID number of the information reproducing apparatus 20) that needs to be held regardless of the FF can be stored. As a result, a dedicated ROM for storing such information can be omitted, so that cost can be reduced.

The information recording device 10 is not limited to a dedicated device, but may be a general-purpose personal computer and an I / O device.
A combination of a dedicated nonvolatile memory adapter that can read the D number may be used. In this case, the information compression processing and encryption processing are performed by software processing by the CPU of the personal computer. With such a configuration, a low-cost information recording device can be realized without a dedicated device. As the encryption method, a method in which the encryption key and the decryption key are the same (representative example: DES) and a method in which different encryption keys and decryption keys are paired (representative example:
RSA). In the former case, the encryption key (= decryption key)
May be obtained based on the ID code. In the latter case, it is necessary to obtain both the encryption key and the decryption key based on the ID code. For example, a predetermined portion of the ID code is associated with the encryption key, and another predetermined portion of the ID code is associated with the decryption key.
And the decryption key can be read.
Furthermore, in the ID code configuration that can support both the encryption key and the decryption key as described above, the same value is given to the encryption key and the decryption key so that the encryption key and the decryption key are the same. Can be made available.

[0015]

According to the present invention, the digital information stored in the rewritable area in the removable nonvolatile memory uses the unique ID information previously stored in the non-rewritable area in the nonvolatile memory. The digital information stored in the rewritable area at the time of reproduction is decrypted using the ID information in the non-rewritable area. Therefore, if the digital information stored in the rewritable area is illegally copied from another nonvolatile memory, the ID information used for encrypting the digital information and the rewrite in the nonvolatile memory are used. Since the ID information recorded in the unusable area does not match, correct reproduction cannot be performed. Therefore, copyright infringement due to unauthorized copying of digital information can be prevented. Further, in the digital information reproducing apparatus according to the third invention, there is provided a built-in nonvolatile memory having a higher speed and / or a larger number of times of rewriting than the removable nonvolatile memory. Storing a decryption program used for decryption processing by means,
If the decoding process is performed by the reproducing means using the built-in nonvolatile memory, for example, compared to the case where the decoding process is performed with the decoding program stored in the removable nonvolatile memory, The removable nonvolatile memory can be configured at low cost. Further, if various kinds of setting information at the time of power OFF are stored in the above-mentioned built-in nonvolatile memory, the above various kinds of setting information are stored in the power supply when the power is turned on again.
It is possible to reproduce the same state as at the time of FF, and the usability is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration and a processing flow of a digital information recording / reproducing system A1 according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a process when the digital information recording / reproducing system A1 attempts to reproduce music information copied illegally.

[Explanation of symbols]

0: Flash memory (an example of a removable nonvolatile memory) 1a: Non-rewritable area 1b: Rewritable area 10: Information recording device (an example of a digital information recording device) 11: Encoding section 12: Encryption key generation section 13: Encryption Decoding unit 20 Information reproducing device (an example of a digital information reproducing device) 21 Decryption key generation unit 22 Decryption processing unit 23 Decoding unit 24 D / A conversion unit 25 Amplifier

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiro Yamashita 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo F-term in Kobe Steel, Ltd. Kobe Research Institute F-term (reference) 5B017 AA06 AA07 BA07 BB10 CA11

Claims (7)

[Claims] 1. A digital information recording device for recording predetermined digital information and a digital information recording device for recording the predetermined digital information, and a digital information reproducing device for reproducing the recorded digital information. A removable non-volatile memory having a rewritable area and a non-rewritable area, wherein the digital information recorded in the rewritable area by the digital information recording device is encrypted in the non-rewritable area; A removable nonvolatile memory, wherein unique ID information is recorded in the nonvolatile memory used for decryption of the encrypted digital information in the rewritable area by the digital information reproducing device. 2. A digital information recording apparatus for recording predetermined digital information in a removable nonvolatile memory, wherein ID information unique to each nonvolatile memory is previously recorded in a non-rewritable area in the nonvolatile memory. ID information reading means for reading the digital information, encryption means for encrypting the predetermined digital information based on the ID information read by the ID information reading means, and digital information encrypted by the encryption means. Recording means for recording the information in a rewritable area in the nonvolatile memory. 3. A digital information reproducing apparatus for reading and reproducing digital information recorded in a removable nonvolatile memory, wherein the digital information reproducing device reads out digital information recorded in the nonvolatile memory from a non-rewritable area in the nonvolatile memory, ID information reading means for reading the ID information of the above, digital information reading means for reading predetermined digital information encrypted from the rewritable area in the nonvolatile memory based on the ID information in the non-rewritable area,
Decryption means for decrypting the digital information read by the digital information reading means based on the ID information read by the ID information reading means;
A digital information reproducing apparatus comprising: reproducing means for decoding the digital information decrypted by the decryption means and outputting the digital information. 4. A built-in nonvolatile memory having a higher speed and / or a larger number of times of rewriting than the removable nonvolatile memory, and performing a decoding process by the reproducing means using the built-in nonvolatile memory. 3. The digital information reproducing apparatus according to 3. 5. The digital information reproducing apparatus according to claim 4, wherein a decoding program used for decoding processing by said reproducing means is stored in said built-in nonvolatile memory. 6. A power supply OF in the built-in nonvolatile memory.
6. The digital information reproducing apparatus according to claim 4, wherein various setting information at the time of F is stored. 7. A removable nonvolatile memory, a digital information recording device for recording predetermined digital information in said nonvolatile memory, and said nonvolatile memory in which digital information is recorded by said digital information recording device. In a digital information recording / reproducing system including a digital information reproducing apparatus for reading and reproducing digital information, a rewritable area and a non-rewritable area are formed in the nonvolatile memory, and the non-rewritable area is formed in the non-rewritable area. The ID information unique to the nonvolatile memory is stored in advance, and the digital information recording device encrypts the predetermined digital information based on the ID information in the non-rewritable area in the nonvolatile memory. After processing, it is recorded in the rewritable area in the nonvolatile memory. , The digital information reproducing apparatus is
The encrypted digital information recorded in the rewritable area in the nonvolatile memory is reproduced after performing decryption processing based on the ID information in the non-rewritable area in the nonvolatile memory. A digital information recording / reproducing system characterized by being performed.