JP2003044361A - Data storage/reproduction system, data storage device, data reproducing device, data storage/reproducing method, program and medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that efficient storage/reproduction of musical data has not been performed. SOLUTION: This musical data storage device 101 is provided with an input/ output I/F 113 to output encoded musical data to a musical data reproducing device 102, a disk control means 111 to store the encoded musical data in the disk 110 as a copy and delete unencoded musical data from a disk 110 and an encoding/decoding means 112 to encode the musical data stored in the disk 110 by using an encoding key to be transferred from the musical data reproducing device 102 and to decode the encoded musical data which is stored as the copy by using a decoding key to be transferred from the musical data reproducing device 102 when the encoded musical data is deleted at the musical data reproducing device 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data storage / reproduction system for storing / reproducing music data, for example.
The present invention relates to a data storage device, a data reproduction device, a data storage / reproduction method, a program, and a medium.

[0002]

2. Description of the Related Art Up to now, digital music (sound) information has been recorded on a small and large-capacity removable recording medium such as a magnetic tape, a magnetic disk, or an optical disk, and a portable reproducing apparatus has been used. I was able to play it whenever and wherever I wanted.

In recent years, with the progress of audio data compression technology and the increase in capacity of semiconductor memories, a reproducing apparatus using a semiconductor memory such as a flash memory as a recording medium has come to be used. Since the reproducing apparatus using such a semiconductor memory does not involve any mechanical operation, it can be made smaller and lighter than the reproducing apparatus using a tape or a disk. Furthermore, since the power consumption is low, it is possible to reproduce for a long time, and it is now becoming popular.

On the other hand, since a recording medium using such a semiconductor memory can be easily read and rewritten by a computer or the like, there is an increasing need for copyright protection.

Therefore, in a recording medium using a semiconductor memory, in order to protect the copyright without impairing its convenience, a method of permitting only movement without permitting duplication of data is used. That is, with this method, when reading from one recording medium and writing to another recording medium, it is guaranteed that there is always only one data by always erasing the original data that has been read, and thus the copyright Is to protect. For example, when an SD card is used as the semiconductor memory, such a copyright protection system is called "check-in-check-out".

Although the cost per capacity of a semiconductor memory is higher than that of a tape or a disk, one semiconductor memory is often rewritten and used many times because there is little deterioration depending on the number of times of rewriting. .

[0007]

However, in such a conventional method in which only the movement is permitted without the duplication of the data being permitted, when the contents of the semiconductor memory are rewritten, the data written therein is read and other recording is performed. It must be moved to the medium (if not moved to another recording medium, the data will be lost).

Therefore, in order to rewrite the semiconductor memory, it is necessary to perform two operations of reading and writing, which takes twice as long as the normal writing time. Therefore, for example, rewriting of the semiconductor memory via a network or the like having a limited data transfer rate has not been practical.

In consideration of the above-mentioned conventional problems, the present invention provides, for example, a data storage / reproduction system, a data storage device, a data reproduction device, and a data storage / reproduction method capable of efficiently storing / reproducing music data. , Programs, and media.

[0010]

[Means for Solving the Problems] The first invention (Claim 1)
Corresponds to a data storage device for storing data, and a data reproduction device for reproducing the stored data, wherein the data storage device is a data storage device side for storing data. A medium and an encryption unit for encrypting predetermined data of the data stored in the data storage device side medium by using the encryption key passed from the data reproduction device side; Output means for outputting the specified data thus reproduced to the data reproducing device side, and the predetermined part before being encrypted after the encrypted predetermined data is stored as a copy in the data storage device side medium. Means for erasing the data in the data storage device side from the data storage device side, and when the output encrypted predetermined data is erased in the data reproducing device side, And a decryption means for decrypting the encrypted predetermined data stored as a copy by using the decryption key passed from the data reproducing device side, Encryption key generation means for generating an encryption key for encrypting the predetermined data, which is passed to the storage device side, and the data storage that is encrypted by using the passed encryption key An input means for inputting the predetermined data whose copy is stored in the device side from the data storage device side; a data reproducing device side medium for storing the input encrypted predetermined data; Reproducing means for reproducing the encrypted predetermined data stored in the data reproducing device side medium, and erasing the encrypted predetermined data stored in the data reproducing device side medium Data storage / reproduction having decryption key generation means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy, which is passed to the data storage device side when the data is stored. System.

In a second aspect of the present invention (corresponding to claim 2), the predetermined data stored in the medium for the data storage device has unique ID information, the encryption key and / or the encryption key and / or the encryption key. The generation of the decryption key is performed by the data storage / reproduction system according to the first aspect of the present invention in which the unique ID information of the predetermined data is taken into consideration.

According to a third aspect of the present invention (corresponding to claim 3), when the encrypted predetermined data is erased on the data reproducing device side, the data reproducing device side transfers the data to the data storing device side. Passing the decryption key means
(1) Erase information indicating that the encrypted predetermined data has been erased on the data reproducing apparatus side is held on the data reproducing apparatus side, and (2) predetermined on the basis of the held erase information. The data storage / reproduction system according to the first aspect of the present invention is that the decryption key is transferred from the data reproduction device side to the data storage device side at the timing of.

According to a fourth aspect of the present invention (corresponding to claim 4), the decryption key is transferred from the data reproducing device side to the data storing device side via a predetermined network. It is a data storage and reproduction system of the invention.

In a fifth aspect of the present invention (corresponding to claim 5), when the decryption key is transferred from the data reproducing device side to the data storing device side via the predetermined network, the data storing device side Is a data storage / reproduction system according to the first aspect of the present invention, which is provided with an authentication server for authenticating.

According to a sixth aspect of the present invention (corresponding to claim 6), a data storage device side medium for storing data and an encryption key passed from the data reproduction device side are used to store the data storage device. Encryption means for encrypting predetermined data among the data stored in the side medium; output means for outputting the predetermined data that has been encrypted to the data reproducing device side; and the encrypted data. Medium control means for storing predetermined data as a copy in the data storage device side medium, and erasing the predetermined data before encryption from the data storage device side medium, and output encryption When the predetermined data is erased on the data reproducing device side, the decrypted key passed from the data reproducing device side is used to store the encrypted predetermined data stored as a copy. A data storage device and a decoding means for decoding data.

According to a seventh aspect of the present invention (corresponding to claim 7), an encryption key generating means for generating an encryption key for encrypting predetermined data, which is passed to the data storage device side, and the receiving device. An input means for inputting the predetermined data from the data storage device side, which is encrypted by using the passed encryption key and whose copy is stored in the data storage device side, and the input encrypted data A data reproducing device side medium for storing the predetermined data, a reproducing means for reproducing the predetermined encrypted data stored in the data reproducing device side medium, and the data reproducing device side medium Decrypts the encrypted predetermined data stored as the copy, which is passed to the data storage device side when the predetermined encrypted data stored in is deleted. A data reproduction apparatus and a decryption key generation means for generating a decryption key fit.

An eighth aspect of the present invention (corresponding to claim 8) is a data storage / reproduction method for reproducing data stored on the data storage side on the data storage side, wherein the data is stored on the data storage side. And a step of encrypting predetermined data of the data stored in the data storage side using the encryption key passed from the data reproducing side, and the encrypted predetermined The step of outputting the data to the data reproducing side, storing the encrypted predetermined data in the data storing side as a copy, and then transmitting the predetermined data before being encrypted from the data storing side. A step of erasing and using the decryption key passed from the data reproducing side when the output encrypted predetermined data is erased on the data reproducing side, And decrypting the encrypted predetermined data stored therein, and generating an encryption key for encrypting the predetermined data, which is passed to the data storage side, The step of inputting from the data storage side the predetermined data which is encrypted using the passed encryption key and whose copy is stored in the data storage side, and the input predetermined encrypted Storing the data on the data reproducing side, reproducing the encrypted predetermined data stored on the data reproducing side, and the encrypted predetermined data stored on the data reproducing side. A decryption key for decrypting the encrypted predetermined data stored as the copy, which is passed to the data storage side when the data of is deleted. A data storage and reproducing method comprising the step of forming.

A ninth aspect of the present invention (corresponding to claim 9) uses the encryption key transferred from the data reproducing device side of the data storing and reproducing system of the first aspect of the present invention, to the data storing device. Encryption means for encrypting predetermined data among the data stored in the side medium; output means for outputting the predetermined data that has been encrypted to the data reproducing device side; and the encrypted data. Medium control means for storing predetermined data as a copy in the data storage device side medium, and erasing the predetermined data before encryption from the data storage device side medium, and output encryption When the predetermined data is erased on the data reproducing device side, the decryption key transferred from the data reproducing device side is used to store the encrypted predetermined data stored as a copy. Decrypting means for decrypting data, an encryption key generating means for generating an encryption key for encrypting the predetermined data, which is passed to the data storage device side, and the passed encryption An input unit for inputting the predetermined data, which is encrypted by using an encryption key and whose copy is stored in the data storage device side, from the data storage device side, and is stored in the data reproducing device side medium. Playback means for playing back the encrypted predetermined data, and handed over to the data storage device side when the encrypted predetermined data stored in the data playback device side medium is erased A computer functioning as a whole or a part of a decryption key generation means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy. It is because of the program.

A tenth aspect of the present invention (corresponding to claim 10) uses the encryption key passed from the data reproducing device side of the data storing device according to the sixth aspect of the present invention, and uses the data storing device side medium. Encryption means for encrypting predetermined data among the data stored in the storage device, output means for outputting the encrypted predetermined data to the data reproducing device side, and the encrypted predetermined data. After storing the data in the data storage device side medium as a copy, the medium control means for deleting the predetermined data before the encryption from the data storage device side medium, and the outputted encrypted When the predetermined data is erased on the data reproducing device side, the decryption key transferred from the data reproducing device side is used to recover the encrypted predetermined data stored as a copy. Is a program for causing a computer to function as all or part of a decoding means for reduction.

The eleventh invention (corresponding to claim 11) is
In the data reproducing apparatus of the seventh aspect of the present invention, an encryption key generating means for generating an encryption key for encrypting predetermined data transferred to the data storage apparatus side, and the transferred encryption key. Input means for inputting from the data storage device side the predetermined data which is encrypted by using the data storage device and a copy of which is stored in the data storage device side; and the predetermined data stored in the data reproducing device side medium. Reproducing means for reproducing the encrypted data, and when the predetermined encrypted data stored in the data reproducing device side medium is erased, it is passed to the data storing device side, To cause a computer to function as a whole or a part of a decryption key generating means for generating a decryption key for decrypting the predetermined data encrypted as a copy. Is a program.

The twelfth aspect of the present invention (corresponding to claim 12) is
In the data storage / reproduction system of the first aspect of the present invention, by using the encryption key passed from the data reproduction device side, predetermined data among the data stored in the data storage device side medium is encrypted. Encryption means for encrypting, output means for outputting the encrypted predetermined data to the data reproducing device side, and storing the encrypted predetermined data as a copy in the data storage device side medium. A medium control means for erasing the predetermined data before being encrypted from the data storage device side medium, and when the output predetermined encrypted data is erased by the data reproducing device side Decryption means for decrypting the encrypted predetermined data stored as a copy by using the decryption key passed from the data reproducing device side, and the data storage Encryption key generation means for generating an encryption key for encrypting the predetermined data, which is passed to the storage side, and the data storage device, which is encrypted by using the passed encryption key. An input means for inputting the predetermined data whose copy is stored on the data storage device side from the data storage device side, and a reproduction for reproducing the encrypted predetermined data stored on the data reproduction device side medium. And means for transmitting the encrypted predetermined data stored in the medium on the data reproducing device side to the data storage device side when the predetermined data encrypted is erased. Is a medium carrying a program for causing a computer to function as all or part of a decryption key generating means for generating a decryption key for decrypting the data of It is a medium that can be processed by computer.

The thirteenth invention (corresponding to claim 13) is
Using the encryption key passed from the data reproducing device side of the data storing device of the sixth aspect of the present invention, predetermined data in the data stored in the medium of the data storing device side is encrypted. Encryption means, and output means for outputting the encrypted predetermined data to the data reproducing device side,
Medium control means for storing the encrypted predetermined data as a copy in the data storage device side medium, and erasing the predetermined data before being encrypted from the data storage device side medium, When the output encrypted predetermined data is erased on the data reproducing device side, the decrypted key passed from the data reproducing device side is used, and the encrypted encrypted data stored as a copy. It is a medium that carries a program for causing a computer to function as all or a part of a decryption unit that decrypts predetermined data, and is a medium that can be processed by the computer.

The fourteenth invention (corresponding to claim 14) is
In the data reproducing apparatus of the seventh aspect of the present invention, an encryption key generating means for generating an encryption key for encrypting predetermined data transferred to the data storage apparatus side, and the transferred encryption key. Input means for inputting from the data storage device side the predetermined data which is encrypted by using the data storage device and a copy of which is stored in the data storage device side; and the predetermined data stored in the data reproducing device side medium. Reproducing means for reproducing the encrypted data, and when the predetermined encrypted data stored in the data reproducing device side medium is erased, it is passed to the data storing device side, To cause a computer to function as a whole or a part of a decryption key generating means for generating a decryption key for decrypting the predetermined data encrypted as a copy. A carrying medium the program is a medium that can be processed by a computer.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, referring to FIG. 1, which is a diagram showing a schematic configuration of a music data storage device 101 and a music data reproduction device 102 in a first embodiment of the present invention, a music data storage device 101. The configuration of the music data reproducing device 102 will be described.

It is assumed that the input / output I / Fs (interfaces) 113 and 122 are connected to each other and correspond to interface circuits for transmitting and receiving data and control information.

The music data storage device 101 is provided with a disk 110 for storing music data. This disk 110 has music data A which is purchased in advance by music distribution via a network and which is prohibited from duplication. 130 is stored. Here, the music data A 130 stored in the disk 110 is music data compressed by a method such as MP3 or AAC. The disk 110 is a storage device such as a hard disk or an optical disk.

The disk 110 corresponds to the means including the medium of the data storage device of the present invention, and the disk control means 1
Reference numeral 11 corresponds to the means including the medium control means of the present invention, encryption / decryption means 112 corresponds to the means including the encryption means and the decryption means of the present invention, and the input / output I / F 113 is the output of the present invention. The music data storage device 101 corresponds to the data storage device of the present invention. Further, the memory 120 corresponds to a unit including the medium of the data reproducing apparatus of the present invention, the input / output I / F 122 corresponds to a unit including the input unit of the present invention, and the reproducing unit 123 includes a unit including the reproducing unit of the present invention. The key information generating means 124 corresponds to the means including the encryption key generating means and the decryption key generating means of the present invention, and the music data reproducing device 102 corresponds to the data reproducing device of the present invention. Further, the means including the music data storage device 101 and the music data reproduction device 102 corresponds to the data storage / reproduction system of the present invention, and the music data of the present embodiment corresponds to the data of the present invention.

Next, the operations of the music data storage device 101 and the music data reproduction device 102 will be described. An example of the data storage / reproduction method of the present invention will be described while the operations of the music data storage device 101 and the music data reproduction device 102 are described (the same applies to the following embodiments).

(1) When the music data A 130 stored in the disk 110 is moved to the memory 120 included in the music data reproducing device 102; in such a case, the encryption / decryption means of the music data storing device 101 112
First, the key information generating means 1 of the music data reproducing apparatus 102.
The encryption key A corresponding to the memory 120 is read from 24. The encryption key A is generated by the key information generation means 124 through the information read from the memory 120 through the memory control means 121. For example, the encryption key A is generated based on a serial number or an ID number that corresponds to the memory 120 on a one-to-one basis. To be done.

The encryption / decryption means 11 of the music data storage device 101 which has read the encryption key A from the key information generation means 124 via the input / output I / Fs 113 and 122.
2 instructs the disc control means 111 to read the music data A 130 recorded on the disc 110. Then, the read music data A 130 is encrypted by using the encryption key A read from the key information generating means 124 as a parameter and transmitted to the memory control means 121 of the music data reproducing apparatus 102. Memory control means 121
The encrypted music data received from the encryption / decryption means 112 is stored in the memory 1 as music data C 132.
Write to 20.

On the other hand, the encryption / decryption means 112 of the music data storage device 101 instructs the disk control means 111 the same data as the one transmitted to the memory control means 121, which is encrypted by the encryption key A. Thus, the music data B 131 is recorded on the disc 110. At this time, the music data A is erased. Here, music data B1
No. 31 cannot be decrypted without a decryption key received from the music data reproducing device 102, and even if read out, it is invalid data and cannot be used as music data.

In this way, the music data reproducing device 102
When reproducing the music data C 132 written in the memory 120, the reproducing unit 123 uses the memory control unit 121.
To read the music data C 132,
The decryption key A corresponding to the encryption key A is received from the key information generating means 124. Then, the music data C 132 is decrypted by the decryption key A, the compression is expanded, and the compressed data is output as voice.

(2) When the music data C 132 written in the memory 120 of the music data reproducing apparatus 102 moved by the above method is moved to the disc 110; the memory 120 of the music data reproducing apparatus 102.
When writing different music data to the memory,
The music data C 132 may have to be erased depending on the capacity of the. However, after that, music data C
If 132 is required, the music data C 132 will be moved to the disc of the music data storage device 101.

In such a case, in the present embodiment, the music data C 132 is actually read from the memory 120, the read data is decrypted using the decryption key A received from the key information generating means 124 as a parameter, and the disc 110 is read. There is no need to write in.

More specifically, the encryption / decryption means 112 of the music data storage device 101 stores the music data C in the memory control means 121 of the music data reproduction device 102.
The key information generation means 12
The decryption key A is read from 4.

Then, the music data B 131 recorded on the disc 110 is decrypted by using the decryption key A, and written on the disc. Then, the music data B 131 is erased. The data written here is the same as the music data A 130 stored in the disk 110 before being written in the memory 120. On the other hand, music data C1
The memory control means 121 which has received the deletion request of 32
The music data C 132 is deleted from the memory 120.

As described above, in the present embodiment,
In order to restore the music data by decoding the music data B 131, the music data C 132 is stored in the memory 12
It is possible to move data in a short time with the copyright protected without the need to read from 0.

The memory 120 of the music data reproducing apparatus 102 may be removable. Further, the disk 110 and the disk control means 111 of the music data storage device 101 may be any recording medium having a recording function equivalent to this, and may be, for example, a semiconductor memory. Further, as the music data storage device 101, a memory I / F
If a PC equipped with a memory is used and the memory 120 can be removed from the music data reproducing device 102, the memory 120 can be rewritten directly by the PC. In such a case, the encryption / decryption means 112 according to the present embodiment.
The processing equivalent to that of the key information generating means 124 can be realized by software operating on a PC.

(Embodiment 2) First, referring to FIG. 4 which is a diagram showing a schematic configuration of a music data storage device 401 and a music data reproduction device 402 in a second embodiment of the present invention, a music data storage device 401 The configuration of the music data reproducing device 402 will be described.

The music data storage device 401 and the music data reproduction device 402 are the same as the music data storage device 101 and the music data reproduction device 1 in the first embodiment described above.
It has a configuration similar to that of No. 02, and the same reference numerals are given to the means for realizing the same operation.

The feature of the present embodiment is that by using the encryption key and the decryption key corresponding to each music data, the risk of decrypting the code on the music data storage device 401 side is further reduced. This is possible, but this will be described in detail later.

Next, the operations of the music data storage device 401 and the music data reproduction device 402 will be described.

As in the case of the first embodiment, the disc 110 of the music data storage device 401 stores the music data A 130 which is purchased in advance by music distribution via the network and which is prohibited from being copied. I shall.

When the music data A 130 stored in the disk 110 is moved to the memory 120 provided in the music data reproducing device 120; in such a case, the encryption / decryption means 410 of the music data storing device 401, Music data A 13 by instructing the disk control means 111
A part of 0 is read to generate information about the music data A 130, or unique information corresponding to the music data A 130 based on a part of the music data A 130, such as an ID number of the music data A 130. To do.

Then, the encryption / decryption means 410 sends this unique information to the key information generation means 420 of the music data reproduction device 402, and the key information generation means 420 sends the encryption key A corresponding to the memory 120. , Music data A 13
The encryption key B for storage corresponding to 0 is read out.

This encryption key A is the key information generating means 420.
Is generated by the information read from the memory 120 through the memory control means 121. For example, the memory 1
It is generated on the basis of a serial number, an ID number, etc., which corresponds to each one of 20.

On the other hand, the encryption key B includes the music data A 1 received from the encryption / decryption means 410 in addition to the information read from the memory 120 used to generate the encryption key A.
It is generated based on unique information corresponding to 30. That is, the encryption key B is the music data A 13
This is an encryption key dedicated to 0.

The encryption / decryption means 41 of the music data storage device 401 which has read out the encryption key A and the encryption key B
0 instructs the disc control means 111 to read the music data A 130 recorded on the disc 110.

Then, the read music data A 13
0 is the encryption key A read from the key information generation means 420.
Is encrypted as a parameter, and the music data reproducing device 40
2 to the memory control means 121.

Also, along with this, the encryption / decryption means 4
10 is a key information generating means 420 for the music data A 130.
Encrypted as the encryption key B parameter read from
Disk 1 by giving an instruction to the disk control means 111
10 is recorded as music data B 131. At this time, the music data A 130 is deleted. Of course, the music data B 131 cannot be decrypted without the decryption key received from the music data reproducing device 402.
Even if this is read, it cannot be used as music data because it is invalid data.

On the other hand, the music data reproducing apparatus 4 which has received the encrypted music data from the encryption / decryption means 410.
The memory control means 121 of No. 02 sets this as music data C
It is written in the memory 120 as 132. The reproducing method of the music data C 132 written in the memory 120 of the music data reproducing apparatus 102 in this way is the same as that in the first embodiment.

(2) When the music data C 132 written in the memory 120 of the music data reproducing device 402 moved by the above method is moved to the disc 110; in this case, the encryption of the music data saving device 401 is performed. The decoding / decoding means 410 is a music data reproducing device 402.
The memory controller 121 is requested to delete the music data C 132, and the decryption key B corresponding to the encryption key B is read from the key information generator 420. At this time, the decryption key B is a unique key corresponding to the music data generated by the key information generating means 420 by reading a part of the music data C 132 written in the memory 120 and using the same method as the encryption / decryption means 410. It is generated based on information.

Upon receipt of the encryption key B, the encryption / decryption means 410 receives the music data B recorded on the disc 110.
131 is decrypted using this decryption key B and written to the disc. Then, the music data B 131 is erased. The data written here is the same as the music data A 130 stored in the disk 110 before being written in the memory 120.

On the other hand, the memory control means 121 which has received the deletion request for the music data C 132 erases the music data C 132 from the memory 120.

As described above, in the present embodiment,
In addition to the effect similar to that of the first embodiment, by using the encryption key and the decryption key corresponding to each music data in a one-to-one manner, it is possible to further reduce the risk of decryption. Become.

Note that, as in the first embodiment, the memory 120 of the music data reproducing device 102 may be removable. Further, the disk 110 and the disk control means 111 of the music data storage device 101 may be any recording medium having a recording function equivalent to this, and may be, for example, a semiconductor memory. Furthermore, the encryption / decryption means 41
It is possible to realize processing equivalent to 0 and the key information generation means 420 by software operating on a PC.

(Embodiment 3) First, with reference to FIG. 5, which is a diagram showing a schematic configuration of a music data storage device 501 and a music data reproduction device 502 according to a third embodiment of the present invention, a music data storage device 501. The configuration of the music data reproducing device 502 will be described.

The music data storage device 501 and the music data reproduction device 502 are the same as the music data storage device 101 and the music data reproduction device 1 in the first embodiment described above.
It has a configuration similar to that of No. 02, and the same reference numerals are given to the means for realizing the same operation.

The feature of the present embodiment is that the music data storage device 501 and the music data reproduction device 502 do not have to be connected at the time of moving the music data. It will be described in detail later.

Next, operations of the music data storage device 501 and the music data reproduction device 502 will be described.

It is assumed that the music data C 132 is written in the memory 120 of the music data reproducing device 502 by the same procedure as in the first embodiment.

Here, in a situation where the music data reproducing device 502 is not connected to the music data storing device 501, the music data C132 is stored in the disk 110 of the music data storing device 501 in order to write another music data in the memory 120.
Suppose you need to move to.

When instructed to move the music data C 132, the key information generation management means 520 of the music data reproducing device 502 internally holds that the music data C 132 has been deleted, and instructs the memory control means 121. Then, the music data C 132 is erased. This allows the memory 120
Will ensure a capacity for writing other data.

On the other hand, the encryption / decryption means 510 of the music data storage device 501 again uses the music data reproduction device 502.
When connected to, the key information generation management means 520 receives a notification that the music data C 132 has been deleted.

Upon receiving this notification, the encryption / decryption means 510 reads the decryption key A from the key information generation management means 520. Then, by giving an instruction to the disc control means 111, the music data B 131 recorded on the disc 110 is recorded.
Read, decrypt using decryption key A and write to disc. Then, the music data B 131 is deleted.

Thus, the written data becomes the same as the music data A 130 stored in the disk 110 before being written in the memory 120.

As described above, in the present embodiment,
In addition to the effect similar to the first embodiment, it is not necessary to connect the music data storage device 501 and the music data reproduction device 502 when moving the music data. Therefore, even in the situation where the music data storage device 501 and the music data reproduction device 502 cannot directly communicate with each other, the music data can be moved.

As in the first embodiment, the memory 120 of the music data reproducing device 502 may be removable. Further, the disk 110 and the disk control means 111 of the music data storage device 501 may be any recording medium having a recording function equivalent to this, and may be, for example, a semiconductor memory. Also, the encryption / decryption means 510
And processing equivalent to that of the key information generation management means 520 is performed by the PC
It can be realized by software that operates in.

Furthermore, the key information generation management means 520
It is also applicable to the case where the storage encryption key and the decryption key corresponding to the music data described in Embodiment 2 are used by holding the decryption key as well as the state in which the music data C 132 is deleted. Is.

(Embodiment 4) First, with reference to FIG. 2, which is a diagram showing a schematic configuration of a music data storage device 201 and a music data reproduction device 202 in a fourth embodiment of the present invention, the music data storage device 201 The configuration of the music data reproducing device 202 will be described.

The music data storage device 201 and the music data reproducing device 202 are devices that are equipped with network I / Fs (interfaces) 210 and 220, respectively, and can be connected to the Internet 204.

The music data storage device 201 and the music data reproduction device 202 have a similar configuration to the music data storage device 101 and the music data reproduction device 102 in the first embodiment described above, and have the same operation. The same reference numerals are attached to the means for realizing.

Next, operations of the music data storage device 201 and the music data reproduction device 202 will be described.

It is assumed that the music data C 132 is written in the memory 120 of the music data reproducing device 202 by the same procedure as in the first embodiment.

Here, while the music data reproducing device 202 is being carried and is being used at a place different from the place where the music data storing device 201 is placed, the music data is written in the memory 120 in order to write another music data. It is assumed that it is necessary to move the data C 132 to the disc 110 of the music data storage device 201.

The key information generating means 221 uses the music data C
When the movement of 132 is instructed, the decryption key A is output to the network I / F 220.

The network I / F 220 attaches this decryption key A to an electronic mail and sends it to the Internet 204.

A mail server 203 is connected to the Internet 204, and an electronic mail containing the decryption key A is stored in the mail server 203.

Then, the network I / F 220, which has confirmed the storage in the mail server 203, instructs the memory control means 121 to erase the music data C 132.

As a result, a capacity for writing other data is secured in the memory 120.

At this time, the e-mail to which the decryption key A is attached can be prevented from being abused by encrypting the decryption key A by using PGP or the like.

On the other hand, the network I / F 210 of the music data storage device 201 is connected to the music data reproducing device 2 from the mail server 203 connected to the Internet 204.
02 takes in the electronic mail transmitted with the decryption key A attached, takes out the decryption key A from there, and outputs it to the encryption / decryption means 211.

The encryption / decryption means 211 instructs the disc control means 111 to read the music data B 131 recorded on the disc 110, decrypts it using the decryption key A, and writes it to the disc. At this time, the music data B 131 is deleted.

The data written here is data that can be used as music data.

At this time, the music data reproducing device 20
2 sent an email with decryption key A attached,
There may be a time interval while the music data storage device 201 fetches this electronic mail.

As described above, in the present embodiment,
In addition to the effect similar to that of the first embodiment, the decryption key is transferred by electronic mail using the Internet, so that when the music data is moved, the music data storage device 201 and the music data reproduction device 202 are Does not need to be connected. Therefore, even in the situation where the music data storage device 201 and the music data reproduction device 202 cannot directly communicate with each other, the music data can be moved as long as it can be connected to the Internet.

As in the first embodiment, the memory 120 of the music data reproducing device 202 may be removable. Further, the disk 110 and the disk control means 111 of the music data storage device 201 may be any recording medium having a recording function equivalent to this, and may be, for example, a semiconductor memory. Also, the encryption / decryption means 211
And processing equivalent to the processing realized by the key information generation means 221, the attachment of the decryption key A to the electronic mail by the network I / F 220, the extraction of the decryption key A from the electronic mail by the network I / F 210, and the like. Can be realized by software operating on a PC.

Furthermore, it is possible to apply the notification of the decryption key using such an electronic mail together with the key information depending on the music data described in the second embodiment,
In this case, both effects can be obtained together.

(Fifth Embodiment) First, with reference to FIG. 3, which is a diagram showing a schematic configuration of a music data storage device 301 and a music data reproduction device 302 in a fifth embodiment of the present invention, a music data storage device 301 The configuration of the music data reproducing device 302 will be described.

The music data storage device 301 and the music data reproduction device 302 are devices that include network I / Fs (interfaces) 311 and 321, respectively, and can be connected to the Internet 204.

In this embodiment, the key information management server 303 (authentication server) is connected to the Internet 204.

Further, the encryption / decryption means 310 of the music data storage device 301 has unique information 312 uniquely assigned to the music data storage device 301, and the music data reproduction device 302 from the music data storage device 301. When the music data is moved to, the unique information 312 is passed to the key information generating means of the music data 302 together with the music data.

The music data storage device 301 and the music data reproduction device 302 have a similar configuration to the music data storage device 101 and the music data reproduction device 102 in the first embodiment described above, and have the same operation. The same reference numerals are attached to the means for realizing.

Next, the operation of the music data storage device 301 and the music data reproduction device 302 will be described.

It is assumed that the music data C 132 is written in the memory 120 of the music data reproducing apparatus 302 by the same procedure as in the first embodiment.

However, in the present embodiment, when the music data is transferred from the music data storage device 301 to the music data reproducing device 302, the above-mentioned unique information 312 together with the music data is key information generating means for the music data 302. 32
It has been passed to 0.

Here, while the music data reproducing device 302 is being used in a place different from that of the music data storing device 301, the music data storing device 301 stores the music data C 132 in order to write another music data in the memory 120. Suppose that it is necessary to move to the disk 110 of.

The key information generating means 320 uses the music data C
When the transfer of the data 132 is instructed, the decryption key A and the unique information 312 received from the music data storage device 301 together with the music data C 132 are transferred to the network I / F 2
Output to 20.

The network I / F 220 sends the decryption key A and the unique information 312 to the network I / F 33 of the key information management server 303 via the Internet 204.
Send to 0.

The network I / F 330 stores the received decryption key A and unique information 312 in the key information storage means 331.
Save to.

The music data reproducing device 3 which has finished transmitting the decryption key A and the unique information 312 to the key information management server 303.
02 network I / F 321 instructs the memory control means 121 to erase the music data C 132. As a result, a capacity for writing other data is secured in the memory 120.

On the other hand, the encryption / decryption means 310 of the music data storage device 301 outputs the unique information 312 to the network I / F 311 and the network I / F 311.
Specifies the unique information 312, and the key information management server 30
A request for the decryption key A is made to the third unit.

The key information management server 3 that has received this request
The network I / F 330 of 03 compares the unique information 312 received from the music data storage device 301 with the unique information stored in the key information storage means 331. If the two pieces of unique information are the same, the network I / F 3
30 reads the decryption key A from the key information storage unit 331 to read the network I / F of the music data storage device 301.
311 to send.

At this time, in addition to the confirmation of the unique information 312, the music data storage device 301 can be authenticated by other means.

The network I / F 311 of the music data storage device 301 outputs the received decryption key A to the encryption / decryption means 310, and the encryption / decryption means 310
The disc control means 111 is instructed to read the music data B 131 recorded on the disc 110, and the decryption key A
To decrypt and write to disc. Also at this time,
The music data B 131 is deleted.

The data written here is data that can be used as music data.

At this time, the music data reproducing device 30
There may be a time interval between the time point 2 transmits the decryption key A to the key information management server and the time when the music data storage device 301 takes out the decryption key A.

As described above, in the present embodiment,
In addition to the effect similar to that of the first embodiment, the music data storage device 301 and the music data reproducing device 302 are connected to each other when the music data is moved by transferring the decryption key using the Internet. You don't have to be. Therefore, the music data storage device 301 and the music data reproduction device 3
Even in a situation where 02 cannot directly communicate, music data can be moved as long as it can connect to the Internet. Furthermore, by confirming the music data storage device 301 using the key information management server 303, the security of the decryption key A can be ensured.

As in the first embodiment, the memory 120 of the music data reproducing device 302 may be removable. Further, the disc 110 and the disc control means 111 of the music data storage device 301 may be recording media having a recording function equivalent to this, and may be, for example, a semiconductor memory. Also, the encryption / decryption means 310
The processing realized by the key information generating means 320 and the processing of transmitting / receiving the decryption key A and the unique information 312 by the network I / Fs 311 and 321 can be realized by software operating on a PC.

Furthermore, such a key information management server 3
The passing of the decryption key using 03 can be applied together with the key information depending on the music data described in the second embodiment, and in this case, both effects can be obtained together.

In the above, the first to fifth embodiments have been described in detail.

In short, by using the data storage device side medium for storing the data and the encryption key transferred from the data reproduction device side, a predetermined amount of data stored in the data storage device side medium is used. Encryption means for encrypting the data, output means for outputting the encrypted predetermined data to the data reproducing apparatus side, and after storing the encrypted predetermined data as a copy in the data storage apparatus side medium, Medium control means for erasing the predetermined data before being encrypted from the data storage device side medium, and from the data reproducing device side when the outputted predetermined encrypted data is erased by the data reproducing device side The present invention includes a data storage device including a decryption unit that decrypts predetermined encrypted data stored as a copy by using the delivered decryption key. .

Further, the data is passed to the data storage device side,
An encryption key generating unit that generates an encryption key for encrypting predetermined data, and an encryption key that is encrypted by using the passed encryption key, and a predetermined copy is stored in the data storage device side. Input means for inputting data from the data storage device side, a data reproducing device side medium for storing the input predetermined encrypted data, and a predetermined encrypted data stored in the data reproducing device side medium Reproduction means for reproducing the data, and encryption stored as a copy, which is passed to the data storage device side when the predetermined encrypted data stored in the data reproduction device side medium is erased. The present invention also includes a data reproducing device provided with a decryption key generating means for generating a decryption key for decrypting the generated predetermined data.

Of course, a data storage device for storing data and a data reproduction device for reproducing the stored data are provided, and (a) the data storage device is a data storage device for storing data. An encryption means for encrypting predetermined data among the data stored in the data storage device side medium by using the side medium and the encryption key passed from the data reproduction device side, and the encrypted means. Outputting means for outputting predetermined data to the data reproducing device side, and storing the encrypted predetermined data as a copy in the medium on the data storage device side, and then storing the predetermined data before being encrypted on the data storage device side. A medium control means for erasing from the medium and a decryption key passed from the data reproducing device side when the output predetermined encrypted data is erased on the data reproducing device side. And (b) the data reproducing device receives the predetermined data to be passed to the data storage device side. Data storage that stores the specified data that is encrypted using the encryption key generation means that generates the encryption key for encryption and the encryption key that was passed and that is stored in the data storage device side Input means for inputting from the device side, a data reproducing device side medium for storing the input predetermined encrypted data, and reproduction of the predetermined encrypted data stored in the data reproducing device side medium And a reproducing means for reproducing the encrypted data stored in the medium on the data reproducing device side, which is passed to the data storing device when the encrypted predetermined data is erased. Data storage reproducing system having a decryption key generation means for generating a decryption key for decrypting the data is also included in the present invention.

The predetermined data stored in the medium of the data storage device has unique ID information, and the generation of the encryption key and / or the decryption key requires the unique ID of the predetermined data. Information may be taken into consideration.

When the encrypted predetermined data is erased on the data reproducing device side, the decryption key is passed from the data reproducing device side to the data storing device side.
(1) Erase information indicating that the encrypted predetermined data has been erased on the data reproducing device side is held on the data reproducing device side, and (2) at predetermined timing based on the held erase information. The decryption key may be passed from the data reproducing device side to the data storage device side.

The decryption key may be transferred from the data reproducing device side to the data storing device side via a predetermined network. An authentication server may be provided for authenticating the data storage device side when passing the decryption key from the data reproduction device side to the data storage device side via a predetermined network.

Note that the present invention provides the data storage / reproduction system of the present invention, the data storage device, and all or part of the means (or devices, elements, circuits, sections, etc.) of the data reproduction device described above by a computer. And a program that operates in cooperation with a computer. Of course, the computer of the present invention is not limited to pure hardware such as a CPU, but may include firmware, OS, and peripheral devices.

Further, the present invention is a program for causing a computer to execute all or some of the steps (or steps, operations, actions, etc.) of the above-described data storage / reproduction method of the present invention, which is a computer. It is a program that works in cooperation with.

Note that some means (or devices, elements, circuits, sections, etc.) of the present invention, and some steps (or steps, operations, actions, etc.) of the present invention are performed by a plurality of these means or It is meant to refer to some means or steps in a step, or to some functions or some operations in one means or step.

Further, some devices (or elements, circuits, parts, etc.) of the present invention mean some devices of the plurality of devices, or some means of one device. (Or, an element, a circuit, a part, etc.) or a part of the functions of one means.

Also, a computer-readable recording medium in which the program of the present invention is recorded is included in the present invention. Further, one usage form of the program of the present invention may be a mode in which the program is recorded in a computer-readable recording medium and operates in cooperation with the computer. Further, one usage form of the program of the present invention may be a mode in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer. The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet and light, radio waves, sound waves and the like.

The structure of the present invention may be realized by software or hardware.

The present invention also provides a program for causing a computer to execute all or part of the functions of all or part of the data storage / reproduction system, data storage device, and data reproduction device of the present invention. It is a medium that is carried, and is a medium that can be read by a computer and that the program read by the computer cooperates with the computer to execute the functions.

Further, the present invention is a medium carrying a program for causing a computer to execute all or some of the steps of all or some of the steps of the above-mentioned data storage / reproduction method of the present invention, which is read by the computer. The readable and readable program is a medium that performs the operations in cooperation with the computer.

As described above, the present invention is, for example, a music data storage device capable of transferring music data to and from a music data reproduction device having a copyright protection function, which is for storing music data. A recording medium, an encryption means for reading the first music data recorded on the recording medium with the encryption key acquired from the music data reproducing device, encrypting the first music data, and outputting the encrypted music data as encrypted music data; Data transfer means for transferring encrypted music data to the music data reproducing device; encryption control means for recording the encrypted music data on the recording medium and erasing the first music data; and the music data Decryption means for decrypting the encrypted music data with a decryption key obtained from the playback device and outputting the decrypted music data as decrypted music data; Records easier data on the recording medium, is music data storage apparatus characterized by comprising a decoding control means for erasing the encrypted music data.

Further, the present invention is, for example, a music data reproducing device capable of transferring music data to and from a music data storage device capable of encrypting and decrypting music data. Data recording means for storing, reproducing means for reproducing recorded music data recorded in the data recording means, and an encryption key generated based on information unique to the data recording means for storing the music data An encryption key generating means for providing a device, and a decryption key generating means for generating a decryption key corresponding to the encryption key and providing the decryption key to the music data storage device when the recorded music data is erased. It is a music data reproducing device characterized by comprising.

Further, the present invention is characterized in that, for example, the encryption means transmits information specific to the first music data to the music data reproducing apparatus prior to the acquisition of the encryption key. The music data storage device described above.

Further, according to the present invention, for example, the encryption key generating means may perform encryption based on information unique to the recording medium and information unique to the music data received from the music data storage device. The above-mentioned music data reproducing device is characterized by generating a key.

Further, according to the present invention, for example, when the decryption key generating means cannot pass the decryption key to the music data storage device when the recorded music data is erased, the decryption key is recorded. The above-mentioned music data reproducing apparatus is characterized in that it retains that the completed music data has been erased and transfers the decryption key to the music data storing apparatus when connected to the music data storing apparatus.

Further, the present invention is characterized in that, for example, the music data reproducing apparatus is provided with a connecting means for connecting to the Internet, and the encryption key generating means transmits the decryption key attached to an electronic mail. The above-mentioned music data reproducing device.

Further, in the present invention, for example, the music data storage device includes connection means for connecting to the Internet, the decryption means receives an electronic mail, and the decrypted data received by being attached to the electronic mail. The above-described music data storage device is characterized by performing decryption using a key.

Further, the present invention is, for example, a connection means for connecting to the Internet, a decryption key storage means for receiving and storing a decryption key from the music data reproducing device via the internet, and a music data storage device for storing the decryption key. And a decryption key transmitting unit that authenticates the music data storage device when a decryption key request is received, and transmits the decryption key to the music data storage device only when the authentication is successful. Is a key information management server.

Further, in the present invention, for example, the music data reproducing apparatus includes a connecting means for connecting to the Internet, and the encryption key generating means causes the decryption key to be transferred to a key information management server connected to the Internet. It is the above-mentioned music data reproducing device characterized by transmitting.

Further, according to the present invention, for example, the music data storage device includes a connection means for connecting to the Internet, and the decryption means performs authentication by communicating with a key information management server connected to the Internet. The above-mentioned music data storage device is characterized in that it receives and decrypts using the decryption key received as a result.

Further, the present invention is, for example, a music data management system which comprises a music data storage device and a music data reproduction device, and which moves music data between the music data storage device and the music data reproduction device, The music data storage device reads and encrypts the first music data recorded on the recording medium by using a recording medium for storing the music data and an encryption key obtained from the music data reproducing device. Encryption means for outputting as encrypted music data, data transfer means for transferring the encrypted music data to the music data reproducing device, and recording the encrypted music data on the recording medium, The encrypted music data is erased by the encryption control means for erasing the music data and the decryption key acquired from the music data reproducing device. Decoding means for decoding and outputting as decrypted music data, and decryption control means for recording the decrypted music data in the recording medium and erasing the encrypted music data, the music data The reproducing device includes a data recording unit for storing music data,
Reproducing means for reproducing the recorded music data recorded in the data recording means, and encryption key generating means for providing the music data storage device with an encryption key generated based on the information unique to the data recording means. And a decryption key generation unit that generates a decryption key corresponding to the encryption key and provides the decryption key to the music data storage device when the recorded music data is erased. When moving the music data to the music data reproducing device, the first music data recorded on the recording medium is encrypted by the encrypting device, and recorded by the data transferring device in the data recording device of the music data reproducing device. In addition to the transfer, the music data is recorded on the recording medium as encrypted music data, and the music data is stored in the music data storage device to the music data storage device. When moving the data, the decryption means that has acquired the decryption key generated when the decryption key generation means of the music data reproducing device erases the recorded music data is A music data management system characterized by performing decoding.

Further, the present invention is, for example, in the case of moving music data from the music data reproducing device to the music data storing device in the music data managing system, wherein the music data reproducing device and the music data storing device are When not connected, the decryption key generation means holds that the recorded music data has been erased, and when the decryption key is connected to the music data storage device, the decryption key is stored in the decryption key of the music data storage device. The above-mentioned music data management system is characterized in that the music data is passed to the converting means.

Further, the present invention is the above-mentioned music data management system, wherein, for example, in the music data management system, the decryption key is transferred via the Internet.

Further, the present invention is the above-mentioned music data management system, wherein, for example, in the music data management system, an electronic mail is used for transferring the decryption key.

Further, according to the present invention, for example, in the music data management system, a key information management server for authenticating the music data storage device is provided on the Internet, and the decryption key is transmitted via the key information management server. Is performed, and the music data storage device is authenticated before the decryption key is transferred to the music data storage device.

Therefore, according to the present invention, when the music data once moved from the music data storage device to the music data reproduction device is moved again to the music data storage device, the music data is read from the music data reproduction device. It can be omitted, and the time required to move the music data can be shortened. Thus, it is possible to protect the copyright of the music data and improve the usability when moving the music data between the music data storage device and the music data reproducing device.

Furthermore, even if the music data storage device and the music data reproducing device cannot be directly connected and communicate with each other when the music data is moved, as a result, a function equivalent to the movement of the music data can be realized. The remarkable effect that is possible is obtained.

[0144]

As is apparent from the above description,
INDUSTRIAL APPLICABILITY The present invention has an advantage that, for example, music data can be efficiently stored and reproduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a music data storage device 101 and a music data reproduction device 102 according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a music data storage device 201 and a music data reproduction device 202 according to a fourth embodiment of the present invention.

FIG. 3 is a diagram showing a schematic configuration of a music data storage device 301 and a music data reproduction device 302 according to a fifth embodiment of the present invention.

FIG. 4 is a diagram showing a schematic configuration of a music data storage device 401 and a music data reproduction device 402 according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a music data storage device 501 and a music data reproduction device 502 according to a third embodiment of the present invention.

[Explanation of symbols]

101, 201, 301, 401, 501 Music data storage device 102, 202, 302, 402, 502 Music data reproduction device 110 Disc 111 Disc control means 112, 211, 310, 410, 510 Encryption / decryption means 113, 122 Input / output I / F 120 Memory 121 Memory control means 123 Playback means 124, 221, 320, 420 Key information generation means 130, 131, 132 Music data 203 Mail server 204 Internet 210, 220, 311, 321, 330 Network I / F 303 key information management server 312 unique information 331 key information storage means 520 key information generation management means

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5B017 AA06 BA05 BA07 CA16                 5D044 AB05 BC01 CC04 DE50 GK17                       HL06                 5D045 DA11                 5J104 AA16 EA04 EA26 MA01 NA02                       PA14

Claims (14)

[Claims] 1. A data storage device for storing data, and a data reproduction device for reproducing the stored data, wherein the data storage device is a data storage device side for storing data. A medium and an encryption unit for encrypting predetermined data of the data stored in the data storage device side medium by using the encryption key passed from the data reproduction device side; Output means for outputting the specified data thus reproduced to the data reproducing device side, and the predetermined part before being encrypted after the encrypted predetermined data is stored as a copy in the data storage device side medium. And a medium control means for erasing the data of the data from the medium on the data storage device side, and when the output encrypted predetermined data is erased on the data reproducing device side. Using the decryption key passed from over data reproducing apparatus,
And a decryption unit for decrypting the encrypted predetermined data stored as a copy, wherein the data reproducing device encrypts the predetermined data transferred to the data storage device side. Encryption key generating means for generating an encryption key for storing the predetermined data which is encrypted by using the passed encryption key and whose copy is stored in the data storage device side. Input means for inputting from the storage device side, a data reproducing device side medium for storing the input encrypted predetermined data, and the encrypted predetermined device stored in the data reproducing device side medium Reproducing means for reproducing the data, and when the encrypted predetermined data stored in the data reproducing device side medium is erased, it is passed to the data storing device side. A data storage / reproduction system, comprising: a decryption key generation unit that generates a decryption key for decrypting the encrypted predetermined data stored as the copy. 2. The predetermined data stored in the data storage device-side medium has unique ID information, and the generation of the encryption key and / or the decryption key is performed using the predetermined data. The data storage / reproduction system according to claim 1, wherein the data storage / reproduction system is performed in consideration of the unique ID information. 3. When the encrypted predetermined data is erased on the data reproducing device side, the decryption key is transferred from the data reproducing device side to the data storing device side (1 ) Erase information indicating that the encrypted predetermined data has been erased on the data reproducing device side is held on the data reproducing device side, and (2) a predetermined timing based on the held erase information. The data storage / reproduction system according to claim 1, wherein the decryption key is transferred from the data reproduction device side to the data storage device side. 4. The data storage / reproduction system according to claim 1, wherein the decryption key is transferred from the data reproduction device side to the data storage device side via a predetermined network. 5. An authentication server for authenticating the data storage device side when passing the decryption key from the data reproduction device side to the data storage device side via the predetermined network. Item 1. The data storage / playback system according to item 1. 6. A data storage device-side medium for storing data and an encryption key transferred from the data reproduction device side are used to store the data stored in the data storage device-side medium. Encryption means for encrypting predetermined data; output means for outputting the encrypted predetermined data to the data reproducing device side; and medium for storing the data as a copy of the encrypted predetermined data And a medium control means for erasing the predetermined data before being encrypted from the data storage device side medium, and the output encrypted predetermined data is stored in the data reproducing device side. Decryption means for decrypting the encrypted predetermined data stored as a copy by using the decryption key passed from the data reproducing device side when erased by Data storage device provided with. 7. An encryption key generating means for generating an encryption key for encrypting predetermined data, which is passed to the data storage device side, and an encryption using the passed encryption key. And an input means for inputting the predetermined data, the copy of which is stored in the data storage device side, from the data storage device side, and a data reproducing device for storing the input encrypted predetermined data. Side medium, reproducing means for reproducing the predetermined encrypted data stored in the data reproducing device side medium, and the predetermined encrypted data stored in the data reproducing device side medium Decryption for generating a decryption key for decrypting the predetermined encrypted data stored as the copy, which is passed to the data storage device side when data is erased Data reproducing device provided with a generation unit. 8. A data storage / reproduction method for reproducing data stored on the data storage side on the data reproduction side, the step of storing the data on the data storage side, and passing from the data reproduction side. Encrypting predetermined data of the data stored in the data storage side using an encryption key, and outputting the encrypted predetermined data to the data reproduction side A step of storing the encrypted predetermined data as a copy in the data storage side and then erasing the predetermined data before the encryption from the data storage side, and the output encrypted data When the predetermined data is erased on the data reproducing side, the decryption key passed from the data reproducing side is used to encrypt the data stored as a copy. Decrypting the predetermined data; generating an encryption key for encrypting the predetermined data, which is passed to the data storage side; and using the passed encryption key. Input from the data storage side, the predetermined data that has been encrypted and stored in the data storage side, and a step of storing the input encrypted predetermined data on the data reproduction side. And a step of reproducing the encrypted predetermined data stored on the data reproducing side, and the data storage when the encrypted predetermined data stored on the data reproducing side is erased. Generating a decryption key for decrypting the encrypted predetermined data stored as the copy, which is delivered to the user. How to save and play data. 9. The data storage / reproduction system according to claim 1, wherein a predetermined one of the data stored in the data storage device side medium is utilized by using an encryption key passed from the data reproduction device side. Means for encrypting the encrypted data, output means for outputting the encrypted predetermined data to the data reproducing apparatus side, and the encrypted predetermined data as a copy on the data storage apparatus side medium. Medium control means for erasing the predetermined data before being encrypted after the data is stored, on the data storage device side medium;
When the output encrypted predetermined data is erased on the data reproducing device side, the decrypted key passed from the data reproducing device side is used, and the encrypted encrypted data stored as a copy. Decryption means for decrypting predetermined data, encryption key generation means for generating an encryption key for transmitting the predetermined data, which is passed to the data storage device side, and the passed An input means for inputting the predetermined data from the data storage device side, which is encrypted by using an encryption key, and a copy of which is stored in the data storage device side; And a reproducing means for reproducing the encrypted predetermined data, and the device for deleting the encrypted predetermined data stored in the data reproducing device side medium. A computer as all or a part of the decryption key generation means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy, which is transferred to the data storage device side. A program to make it work. 10. The encryption key transferred from the data reproducing device side of the data storage device according to claim 6,
Encryption means for encrypting predetermined data among the data stored in the data storage device side medium; output means for outputting the encrypted predetermined data to the data reproducing device side; Medium control means for storing the encrypted predetermined data as a copy in the data storage device-side medium and erasing the predetermined data before encryption from the data storage device-side medium; When the encrypted predetermined data is erased on the data reproducing device side, the decrypted key transferred from the data reproducing device side is used to store the encrypted predetermined data stored as a copy. A program for causing a computer to function as a whole or a part of a decryption means for decrypting the data of. 11. An encryption key generating means for generating an encryption key for encrypting predetermined data transferred to the data storage device side of the data reproducing device according to claim 7, and the transfer. Input means for inputting from the data storage device side the predetermined data which is encrypted using the encryption key and whose copy is stored in the data storage device side.
A reproducing means for reproducing the predetermined encrypted data stored in the data reproducing device side medium, and a deletion of the predetermined encrypted data stored in the data reproducing device side medium. All or part of the decryption key generation means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy, which is passed to the data storage device side when A program for operating a computer as a computer. 12. The data storage / reproduction system according to claim 1, wherein a predetermined one of the data stored in the data storage device side medium is utilized by using an encryption key passed from the data reproduction device side. Means for encrypting the encrypted data, output means for outputting the encrypted predetermined data to the data reproducing apparatus side, and the encrypted predetermined data as a copy on the data storage apparatus side medium. The medium control means for erasing the predetermined data before being encrypted after being stored and the data storage device side medium, and the output predetermined encrypted data on the data reproducing device side. Decryption means for decrypting the encrypted predetermined data stored as a copy by using the decryption key passed from the data reproducing device side when the data is erased, Encryption key generating means for generating an encryption key for encrypting the predetermined data, which is passed to the data storage device side; and encryption using the passed encryption key, Input means for inputting the predetermined data whose copy is stored in the data storage device side from the data storage device side, and reproducing the encrypted predetermined data stored in the data reproducing device side medium. A reproducing means for transmitting the encrypted predetermined data stored in the medium on the side of the data reproducing device to the data storing device when the predetermined data is erased.
Medium carrying a program for causing a computer to function as a whole or a part of a decryption key generating means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy A computer-processable medium. 13. The encryption key passed from the data reproducing device side of the data storage device according to claim 6,
Encryption means for encrypting predetermined data among the data stored in the data storage device side medium; output means for outputting the encrypted predetermined data to the data reproducing device side; Medium control means for storing the encrypted predetermined data as a copy in the data storage device-side medium and erasing the predetermined data before encryption from the data storage device-side medium; When the encrypted predetermined data is erased on the data reproducing device side, the decrypted key transferred from the data reproducing device side is used to store the encrypted predetermined data stored as a copy. Is a medium carrying a program for causing a computer to function as a whole or a part of a decryption means for decrypting the data of, Media. 14. An encryption key generation means for generating an encryption key for encrypting predetermined data transferred to the data storage device side of the data reproducing device according to claim 7, and the transfer. Input means for inputting from the data storage device side the predetermined data which is encrypted using the encryption key and whose copy is stored in the data storage device side.
A reproducing means for reproducing the predetermined encrypted data stored in the data reproducing device side medium, and a deletion of the predetermined encrypted data stored in the data reproducing device side medium. All or part of the decryption key generation means for generating a decryption key for decrypting the encrypted predetermined data stored as the copy, which is passed to the data storage device side when A medium which carries a program for causing a computer to function as, and which can be processed by the computer.