JP2001044983A - Music data distribution system, mobile device and music data receiving adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the usability of a music data distribution system when the music is reproduced according to the distributed music data by decoding the enciphered data and an enciphered key by means of an encipherment key used for a shifter and decoding the music data from the enciphered data. SOLUTION: A control part 301 acquires the ID number of a personal handyphone system(PHS) 20a from the PHS 20a, decodes the ID ciphered data by means of the ID number and outputs the obtained enciphered music data and an enciphered key. A decoding part 304 decodes the enciphered music data outputted from the part 301 by means of the enciphered key and outputs the obtained music data. An expanding part 305 expands the compressed music data outputted from the part 304 and outputs the expanded music data. Then the expanded music data are converted into the analog signals at a D/A conversion part 306, amplified by an amplifier 307 and outputted via a speaker 308 and a headphone 309.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a music data distribution system, a mobile device used for the music data distribution system, and a music data receiving adapter.

[0002]

2. Description of the Related Art In recent years, various so-called music data distribution services for reproducing music by music data distributed via a mobile communication network have been proposed. As a technique for realizing such a service, for example, Japanese Unexamined Patent Application Publication No.
136123 discloses a "music data distribution service system".

[0003] This music data distribution service system includes:
A music data distribution device that performs encryption processing using an encryption key on the music data that has received the distribution request, and that distributes the obtained encrypted music data and the encryption key. It comprises a portable headphone device for reproducing music data. The portable headphone device includes: a mobile phone function unit that receives encrypted music data and an encryption key via a mobile communication network; a storage medium that stores the encrypted music data;
It comprises a memory for storing the encryption key, and a control unit for decrypting the encrypted music data stored in the storage medium using the encryption key stored in the memory and outputting the decrypted music data to headphones.

[0004]

In this portable headphone device, the storage medium storing the encrypted music data cannot be removed from the portable headphone device. Although it has the advantage of protecting the copyright of data, it has the problem of lack of convenience. That is, to reproduce music data, there is no other way than to use a portable headphone device to which the music data has been distributed. Has to receive music data distribution again using the playback device.

[0005] The present invention has been made in view of the circumstances described above, and improves the convenience of playing music with music data distributed via a network.
It is another object of the present invention to provide a music data distribution system capable of effectively protecting the copyright of the music, a mobile device used for the music data distribution system, and a music data receiving adapter.

[0006]

In order to solve the above-mentioned problems, a music data distribution system according to claim 1 is provided.
A music data distribution system including a music data distribution center, a mobile device, and a music playback device, wherein the music data distribution center receives a music data distribution request,
An apparatus for performing encryption processing on the music data using an encryption key to generate encrypted data, and transmitting the encrypted data and the encryption key to a music data distribution request source; A mobile unit for connecting the music playback device to the music data distribution center via a network, and performing an encryption process on the encrypted data and the encryption key using a mobile device encryption key; Requesting means for transmitting a distribution request for music data to the music data distribution center via the mobile device and a network, the requesting means comprising: A receiver for receiving, via a network and a mobile device, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to a request; Output means for outputting the music data as sound; writing means for writing the encrypted data and the encryption key encrypted by the mobile device encryption key to a portable storage medium; and Reading means for reading the encrypted data and the encryption key encrypted by the mobile device encryption key, and obtaining the mobile device encryption key from the mobile device, using the mobile device encryption key, While decrypting the encrypted data and the encryption key received by the receiving means or the encrypted data and the encryption key read by the reading means, the music data is converted from the encrypted data using the encryption key. Decoding means for decoding. A music data distribution system according to claim 2 is a music data distribution system including a music data distribution center, a mobile device, and a music reproducing device, wherein the music data distribution center distributes music data. A device that receives the request, performs an encryption process on the music data using an encryption key to generate encrypted data, and transmits the encrypted data and the encryption key to a music data distribution request source. The mobile device has connection means for connecting the music playback device to the music data distribution center via a network, and sends encrypted data transmitted from the music data distribution center to the music playback device, Storage means for storing the encryption key, wherein the music playback device transmits a sound to the music data distribution center via the mobile device and a network. Request transmitting means for transmitting a data distribution request, receiving means for receiving, via the network and a mobile device, encrypted data of the music data transmitted from the music data distribution center in response to the distribution request; Output means for outputting data as sound, writing means for writing the encrypted data to a portable storage medium, reading means for reading the music data from the portable storage medium, and obtaining the encryption key from the mobile device And decryption means for decrypting the encrypted data received by the receiving means or the encrypted data read by the reading means, using the encryption key. The music data distribution system according to claim 3 includes a music data distribution center,
A music data distribution system including a mobile device and a music playback device, wherein the music data distribution center receives a music data distribution request, and performs an encryption process on the music data using an encryption key. To generate the encrypted data and transmit the encrypted data and the encryption key to a music data distribution request source. The mobile device transmits the music data to the music data distribution center via a network. Request transmitting means for transmitting a distribution request of the music data, and receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. The music reproducing device, decoding means for decoding music data from the encrypted data using the encryption key, and outputting the music data as sound It is characterized by comprising an output unit. In the music data distribution system according to a fourth aspect, in the configuration according to the third aspect, the mobile device encrypts the encrypted data and the encryption key using a mobile device encryption key. An encryption unit for performing processing, wherein the decryption unit obtains the encryption key for the mobile device from the mobile device, and decrypts the encrypted data and the encryption key using the encryption key for the mobile device. In addition, the music data is decrypted from the encrypted data using the encryption key. Here, in the music data distribution system according to a fifth aspect, in the configuration according to the fourth aspect, the encrypted data and the encryption key encrypted by the encryption key for the mobile device are used for music reproduction with the mobile device. It is characterized by being sent to a music playback device via a cable connecting the device. In the music data distribution system according to a sixth aspect, in the configuration according to the fourth aspect, the mobile device transmits the encrypted data and the encryption key encrypted by the mobile device encryption key to a portable type. The music playback device includes writing means for writing to a storage medium, and the music reproducing apparatus includes reading means for reading information written to the portable storage medium. In the music data distribution system according to the seventh aspect, in the configuration according to the third aspect, the mobile device sends the encrypted data transmitted from the music data distribution center to the music reproducing apparatus and transmits the encrypted data to the music reproducing apparatus. Storage means for storing a key, wherein the decryption means of the music playback device acquires the encryption key from the mobile device and decrypts the music data from the encrypted data using the encryption key. It is characterized by. Also, in the music data distribution system according to claim 8, in the configuration according to claim 7, the encrypted data is sent to the music playback device via a cable connecting the mobile device and the music playback device. It is characterized by: The music data distribution system according to claim 9,
8. The configuration according to claim 7, wherein the mobile device includes a writing unit that writes the encrypted data to a portable storage medium, and wherein the music playback device includes the encrypted data written to the portable storage medium. And a reading means for reading the data. The music data distribution system according to claim 10, wherein the music data distribution system includes a music data distribution center, a mobile device, and a music reproducing device, wherein the music data distribution center transmits a music data distribution request. Receiving the music data, performing encryption processing using an encryption key on the music data to generate encrypted data, and transmitting the encrypted data and the encryption key to a music data distribution request source. Requesting means for transmitting a distribution request for music data to the music data distribution center via a network, and encrypted data of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network, and decrypting music data from the encrypted data using the encryption key. Means for encrypting the music data using a mobile device encryption key, wherein the music reproducing apparatus obtains the mobile device encryption key from the mobile device. And a decryption means for decrypting the music data by using the mobile device encryption key, and an output means for outputting the music data as sound. Here, the music data distribution system according to claim 11 is
11. The configuration according to claim 10, wherein the music data encrypted by the mobile device encryption key is sent to the music reproducing device via a cable connecting the mobile device and the music reproducing device. And 13. The music data distribution system according to claim 12, wherein the mobile device writes music data encrypted by the mobile device encryption key to a portable storage medium in the configuration according to claim 10. Wherein the music reproducing apparatus further comprises a reading means for reading the music data written on the portable storage medium. The music data distribution system according to claim 13, further comprising: a music data distribution center; and a mobile device connectable to a music reproduction device via a cable. Receives the music data distribution request, performs encryption processing on the music data using an encryption key to generate encrypted data, and transmits the encrypted data and the encryption key to the music data distribution request. Requesting means for transmitting a distribution request for music data to the music data distribution center via a network, the mobile device being transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving the encrypted data and the encryption key of the music data via the network, and the encrypted data using the encryption key. Decoding means for decoding the music data from the data, and output means for outputting the music data as sound, it is characterized in that the music data through the cable and a data transmission means for sending the music reproducing device. here,
In the music data distribution system according to a fourteenth aspect, in the configuration according to the thirteenth aspect, the mobile device includes an encryption unit configured to perform an encryption process on the music data using a mobile device encryption key. Wherein the data transmission means transmits the music data encrypted by the encryption means to the music reproduction device via a cable. A music data distribution system according to claim 15, comprising a music data distribution center and a mobile device, wherein the music data distribution center receives a music data distribution request, The mobile device comprising: a device that performs encryption processing on data using an encryption key to generate encrypted data, and transmits the encrypted data and the encryption key to a music data distribution request source; Means for transmitting a distribution request of music data to the music data distribution center via a network, and encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving music data via the network, decoding means for decoding music data from the encrypted data using the encryption key, And output means for outputting the music data as sound, the music data, the music reproducing apparatus is characterized by comprising a writing means for writing in a readable portable storage medium. Here, in the music data distribution system according to claim 16, the mobile device includes an encryption unit that performs an encryption process on the music data using a mobile device encryption key, and The means writes the music data encrypted by the encryption means to the portable storage medium. Claim 1
7. The music data distribution system according to 7, wherein the music data distribution system includes a music data distribution center, a mobile device, and a music reproduction device capable of reproducing music data compressed by the first compression method. The music data distribution center receives the music data distribution request and generates encrypted data by performing an encryption process using an encryption key on the music data compressed by the second compression method. Request transmission means for transmitting the encrypted data and the encryption key to a music data distribution request source, wherein the mobile device transmits a music data distribution request to the music data distribution center via a network; Receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means, decoding means for decoding music data from the encrypted data using the encryption key, and compression method conversion means for converting the music data into music data compressed by the first compression method. Wherein the music reproducing apparatus is characterized by decompressing means for expanding music data compressed by the first compression method, and outputting means for outputting the music data as sound. Here, in the music data distribution system according to claim 18, in the configuration according to claim 17, the mobile device performs encryption on the music data by performing an encryption process using a mobile device encryption key. The music reproducing apparatus further comprises: decryption means for acquiring the encryption key for the mobile device from the mobile device and decrypting the music data using the encryption key for the mobile device. It is characterized by. A music data distribution system according to claim 19 is a music data distribution system including a music data distribution center, a mobile device, an adapter, and a music reproducing device, wherein the music data distribution center is a music data distribution center. The music data is received via a data distribution request, the music data is subjected to an encryption process using an encryption key to generate encrypted data, and the encrypted data and the encryption key are transmitted to the music data distribution request source. The mobile device has connection means for connecting the adapter to the music data distribution center via a network, and the adapter is configured to transmit the music data via the mobile device and a network. Request transmission means for transmitting a distribution request of music data to the center, and the music data transmitted from the music data distribution center in response to the distribution request Receiving means for receiving encrypted data and an encryption key via the network and the mobile device; decryption means for decrypting music data from the encrypted data using the encryption key; and an adapter for the music data. Encryption means for performing an encryption process using encrypted data for use, and a data transmission means for sending the music data encrypted by the encryption means to the music playback device, the music playback device, Acquiring the adapter-encrypted data from an adapter, and using the adapter-encrypted data to decode the music data, and output means for outputting the music data as sound. I have. A music data distribution system according to claim 20, further comprising a music data distribution center, a mobile device, and a music reproducing device, wherein the music data distribution center distributes music data. A device that receives the request, performs an encryption process on the music data using an encryption key to generate encrypted data, and transmits the encrypted data and the encryption key to a music data distribution request source. Requesting means for transmitting a distribution request of music data to the music data distribution center via a network, and encryption of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving the encrypted data and the encryption key via the network, and encrypting the music data transmitted from the music data distribution center. Comprising a writing means for writing data and the encryption key in the portable storage medium, the portable storage medium is a nonvolatile memory for storing the encrypted data and encryption keys,
Using an encryption key stored in the nonvolatile memory,
Decoding means for decoding music data from the encrypted data stored in the nonvolatile memory; and D / A conversion means for converting the music data into an analog signal and outputting the analog signal,
The music playback device includes an output unit that outputs the analog signal as a sound. Also,
The music data distribution system according to claim 21, comprising a music data distribution center, a mobile device, and a music reproducing device, wherein the music data distribution center sends a music data distribution request. Receiving the music data, performing encryption processing using an encryption key on the music data to generate encrypted data, and transmitting the encrypted data and the encryption key to a music data distribution request source. Requesting means for transmitting a distribution request for music data to the music data distribution center via a network, and encrypted data of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network, and decrypting music data from the encrypted data using the encryption key. Means, and writing means for writing the music data to a portable storage medium, wherein the portable storage medium stores the music data in a nonvolatile memory, D / A conversion means for converting the analog signal into an analog signal and outputting the analog signal, and the music reproducing apparatus includes output means for outputting the analog signal as sound. A music data distribution system according to claim 22, further comprising a music data distribution center and a mobile device, wherein the music data distribution center receives a music data distribution request and receives the music data distribution request. The mobile device comprising: a device that performs encryption processing on data using an encryption key to generate encrypted data, and transmits the encrypted data and the encryption key to a music data distribution request source; Means for transmitting a distribution request of music data to the music data distribution center via a network, and encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving music data via the network; decryption means for decrypting music data from the encrypted data using the encryption key; Output means for outputting music data as sound, wherein the portable storage medium includes a non-volatile memory for storing the music data, and music data stored in the non-volatile memory. D / A conversion means for converting into an analog signal reproducible by the mounted music reproducing device.

According to a twenty-third aspect of the present invention, the mobile device has means for holding a portable storage medium in a detachable manner, and for writing information received via a wireless channel to the portable storage medium. I have. The mobile device according to claim 24, further comprising: request transmission means for transmitting a music data distribution request to a music data distribution center via a network; and the music transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving encrypted data and an encryption key of the data via the network; and encrypting means for performing encryption processing on the encrypted data and the encryption key using a mobile station encryption key. Data transmission means for transmitting the encrypted data and the encryption key encrypted by the mobile device encrypted data to a music reproducing apparatus connected via a cable. The mobile device according to claim 25, further comprising: a request transmission unit for transmitting a distribution request of music data to a music data distribution center via a network; and the music transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving encrypted data and an encryption key of the data via the network, and data transmitting means for sending the encrypted data to a music reproducing apparatus connected via a cable. I have. Claim 26
A request transmitting means for transmitting a distribution request of music data to a music data distribution center via a network, and encrypted data of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network, encryption means for performing encryption processing on the encrypted data and the encryption key using mobile station encrypted data, and A writing unit that writes the encrypted data and the encryption key encrypted by the encrypted data to a portable storage medium. Also,
The mobile device according to claim 27, further comprising: a request transmitting unit that transmits a distribution request of the music data to the music data distribution center via the network; and a requester that transmits the music data transmitted from the music data distribution center in response to the distribution request. It is characterized by comprising receiving means for receiving encrypted data and an encryption key via the network, and writing means for writing the encrypted data to a portable storage medium. Also,
29. The mobile device according to claim 28, further comprising: a request transmitting unit configured to transmit a distribution request of the music data to the music data distribution center via the network; Receiving means for receiving the encrypted data and the encryption key via the network; decryption means for decrypting the music data from the encrypted data using the encryption key; Encryption means for performing an encryption process using an encryption key. here,
A mobile unit according to a twenty-ninth aspect of the present invention is the mobile device according to the twenty-eighth aspect, further comprising a data transmission unit that sends the music data encrypted by the encryption unit to a music playback device connected via a cable. It is characterized by: A mobile device according to a thirtieth aspect is characterized in that, in the configuration according to the twenty-eighth aspect, the mobile device further comprises a writing unit that writes the music data encrypted by the encryption unit to a portable storage medium. I have. The mobile device according to claim 31, wherein the mobile device is connectable to a music reproducing device via a cable, and a request transmitting unit for transmitting a music data distribution request to the music data distribution center via a network; Receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to a distribution request; and music from the encrypted data using the encryption key. It is characterized by comprising decoding means for decoding data, output means for outputting the music data as sound, and data transmission means for sending the music data to the music reproducing apparatus via the cable. Here, the mobile device according to claim 32, in the configuration according to claim 31, includes an encryption unit that performs an encryption process on the music data using a mobile device encryption key. Features. The mobile device according to claim 33, further comprising: request transmission means for transmitting a music data distribution request to the music data distribution center via a network; and a request transmitting unit for transmitting the music data distribution request from the music data distribution center in response to the distribution request. Receiving means for receiving encrypted data and an encryption key of music data via the network; decrypting means for decrypting music data from the encrypted data using the encryption key; outputting the music data as sound And a writing unit for writing the music data to a portable storage medium readable by a music playback device. here,
34. The mobile device according to claim 34, further comprising: an encryption unit configured to perform an encryption process on the music data using a mobile device encryption key, wherein the writing unit includes Is characterized in that music data encrypted by the encryption means is written to the portable storage medium. 36. The mobile device according to claim 35, wherein the mobile device is a mobile device to which a music reproducing device capable of reproducing music data compressed by the first compression method can be connected. Request transmission means for transmitting a distribution request of the music data, and encrypted data and an encryption key of the music data, which are transmitted from the music data distribution center and are compressed by the second compression method in response to the distribution request, via the network. Means for receiving music data, decoding means for decoding music data from the encrypted data using the encryption key, and a compression method for converting the music data into music data compressed by the first compression method Conversion means.

[0008] A music data receiving adapter according to claim 36 is a request transmitting means for transmitting a music data distribution request to a music data distribution center via a mobile device and a network, and the music data distribution in response to the distribution request. Receiving means for receiving the encrypted data and the encryption key of the music data transmitted from the center via the network and the mobile device, and decoding means for decrypting the music data from the encrypted data using the encryption key Encryption means for performing encryption processing on the music data using the encryption data for an adapter; and data transmission means for transmitting the music data encrypted by the encryption means to the music playback device. It is characterized by doing.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Such an embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.

A: First Embodiment FIG. 1 is a block diagram showing the overall configuration of a music data distribution system according to a first embodiment of the present invention. As shown in FIG. 1, the music data distribution system includes a music data distribution center 10 connected to an ISDN network 2 having a simple mobile telephone station 1 and music data via the simple mobile telephone station 1 and the ISDN network 2. PH that can communicate with distribution center 10
S (simplified mobile phone) 20a and a music playback device 30a connected to the PHS 20a via a cable 50.

The music data distribution center 10 is a computer system for encrypting music data for which a distribution request has been received and distributing the encrypted data to a distribution request source.
1. It comprises a music data memory 102, an encryption unit 103, an encryption key memory 104, and an interface 105.

The control unit 101 functions as a control center of the music data distribution center 10 by exchanging various information with the connected units, ie, the music data memory 102, the encryption unit 103, and the interface 105. I do. The music data memory 102 stores a large number of music data. Each music data stored in the music data memory 102 is data compressed by a predetermined compression method, for example, the MP3 method. Encryption key memory 1
04 stores a number of encryption keys. Encryption unit 103
Is for music data requested to be distributed by the user,
An encryption process is performed using any one of these many encryption keys, and the resulting encrypted music data and the encryption key used for the encryption process are output. These data are transmitted by the control unit 101 to the music data distribution request source via the interface 105 connected to the ISDN 2.

On the other hand, the PHS 20a is a communication terminal device capable of performing voice communication and data communication via the simplified mobile telephone station 1 and the ISDN network 2, and includes a control unit 201,
Storage unit 202, wireless unit 203, display unit 204, operation unit 2
05, voice input / output unit 206 and interface 207
It consists of.

The control unit 201 transmits and receives various information to and from each of the connected units, and functions as a control center of the PHS 20a. Further, the control unit 201 performs A / D
It has a codec consisting of a converter and a D / A converter. The wireless unit 203 includes an antenna, and transmits and receives wireless signals to and from the portable cellular phone station 1 using the antenna. Specifically, it receives a radio signal transmitted from the simple mobile telephone station 1 and outputs a digital signal obtained by demodulating the received signal to the control unit 201, while outputting a digital signal to the control unit 201.
The carrier wave is modulated by the digital signal supplied from the mobile station 1 and the obtained radio signal is transmitted to the mobile telephone station 1 via the antenna. The storage unit 202 includes the control unit 2
01 and various control programs executed by
The ID number (corresponding to “encryption key for mobile device” in the claims) and the like assigned to the HS 20a are stored.

The control unit 201 is a music data distribution center 1
When the encrypted music data and the encryption key distributed from 0 are received via the wireless unit 203, the data is subjected to an encryption process using the ID number stored in the storage unit 202 (hereinafter, referred to as an encryption key). , The encrypted music data and the encryption key encrypted by the ID number,
"ID encrypted data"). This ID encrypted data is output to the music playback device 30a via the cable 50 connected to the interface 207.

The display unit 204 is composed of a liquid crystal panel or the like, and displays various information under the control of the control unit 201. The operation unit 205 includes a plurality of keys,
Information input operations such as numeric input and character input are performed. The voice input / output unit 206 is used when performing voice communication, and includes a microphone for performing voice input and a speaker for performing voice output. The audio signal input from the microphone is
The signal is converted into a digital signal by an A / D converter in the control unit 201 and output to the radio unit 203. On the other hand, a digital signal obtained from a radio signal transmitted from the simple mobile telephone station 1 is converted into an analog signal by a D / A converter in the control unit 201 and output from a speaker.

The music reproduction device 30a is a device for reproducing music data distributed from the music data distribution center 10, and includes a control unit 301, a storage unit 302, and an operation unit 3.
03, decoding section 304, decompression section 305, D / A conversion section 30
6, amplifier 307, speaker 308, headphone 30
9, an interface 310 and a memory card interface 311. The control unit 301
According to the control program stored in the storage unit 302, the entire music reproducing device 30a is controlled. Storage unit 302
Stores a browser in addition to the control program. This browser uses the above PHS20a and ISDN
Access the music data distribution center 10 via the network 2;
Software for transmitting a music data distribution request and receiving the encrypted music data and the encryption key transmitted from the music data distribution center 10 in response to the distribution request via the ISDN 2 and the PHS 20a; It corresponds to "request transmitting means" and "receiving means" in the claims. The storage unit 302 has a PHS in addition to a storage area for storing these various programs.
It has a storage area for storing the ID encrypted data received from 20a. The operation unit 303 includes various keys such as a music playback key for instructing music playback.
A signal corresponding to a user operation is output to the control unit 301. The control unit 301 recognizes which key has been pressed based on this signal.

Further, the control unit 301 obtains the ID number of the PHS 20a from the PHS 20a according to a procedure described later, and decrypts the ID encrypted data using the ID number. It has a function of outputting an encryption key. Decoding unit 3
04 decrypts the encrypted music data output from the control unit 301 using the encryption key, and outputs the music data obtained as a result. The decompression unit 305 includes the decoding unit 30
4 to expand and output the compressed music data. The expanded music data is supplied to the D / A converter 30.
After being converted to an analog signal by the amplifier 6, the amplifier 307
, And output from the speaker 308 and the headphone 309.

On the other hand, a portable memory card 40 having a nonvolatile memory can be mounted on the memory card interface 311 connected to the control unit 301.
The control unit 301 stores the storage unit 3 in response to an instruction from the user.
02 is stored in the memory card 4 connected via the memory card interface 311.
Write to 0.

Next, the operation of this embodiment will be described. a. Operation for Distribution and Storage of Music Data When a predetermined operation is performed on the operation unit 303 of the music playback device 30a and an instruction to request music data to the music data distribution center 10 is given, control is performed. Part 301
Starts the browser stored in the storage unit 302. As a result, the telephone number of the music data distribution center 10 becomes PH
S20a, transmitted to the music data distribution center 10 via the simple mobile telephone station 1 and the ISDN network 2. When the call connection is established with the music data distribution center 10 in this way, the control unit 301 in the music reproduction device 30a transmits a music data distribution request to the music data distribution center 10.

The control unit 101 in the music data distribution center 10 receiving the distribution request reads out the requested music data from the music data memory 102 and
Output to 3. The encryption unit 103 includes an encryption key memory 104
Any of a large number of encryption keys stored in the memory 101 is randomly selected, and the music data supplied from the control unit 101 is subjected to encryption processing using the selected encryption key. The encryption unit 103 outputs the obtained encrypted music data to the control unit 101 together with the encryption key. The control unit 101 transmits the data supplied from the encryption unit 103 to the ISDN 2 via the interface 105.

The control unit 201 in the PHS 20a
Upon receiving the encrypted music data and the encryption key via the N network 2 and the simplified mobile telephone station 1, the encrypted music data and the encryption key are encrypted by the ID number stored in the storage unit 202, and the obtained ID encrypted data is obtained. Is output to the music playback device 30a via the cable 50. Music playback device 30
The control unit 301 in “a” sequentially writes the supplied ID encrypted data into the storage unit 302.

B. Operations for Playing Music Data On the other hand, when a predetermined operation is performed on the operation unit 303 and an instruction to play music data is given, the music playback device 30a
The control unit 301 transmits an ID number request to the PHS 20a. When receiving the ID number request, the control unit 201 in the PHS 20a reads the ID number stored in the storage unit 202 and outputs the ID number to the music playback device 30a.

The music reproducing device 3 receiving the ID number
The control unit 301 within the storage unit 302 stores the I
While reading the D-encrypted data, the data is decrypted using the ID number, and the resulting encrypted data and encryption key are output to the decryption unit 304. The decryption unit 304 decrypts the encrypted music data using the received encryption key, and outputs the resulting music data to the decompression unit 305. The decompression unit 305 decompresses the received music data and outputs it. The music data is converted into an analog signal by the D / A converter 306, amplified by the amplifier 307, and output as a sound from the speaker 308 and / or the headphone 309. With the above operation, music data is reproduced.

C. Operation for Reproducing Music Data by Another Music Playback Device When a predetermined operation is performed on the operation unit 303 and an instruction to write music data to the memory card 40 is given, first, the music playback device 30a Control unit 301
Reads the ID encrypted data from the storage unit 302 and writes the ID encrypted data to the memory card 40 connected to the memory card interface 311. When the ID-encrypted data written in the memory card 40 is to be reproduced by another music reproducing device (having the same configuration as the music reproducing device 30a), the other music to which the memory card 40 is attached is Connect the playback device to the PHS 20a. In this case, when a music data playback instruction is given, the control unit in the music playback device reads the ID encrypted data from the memory card 40, acquires the ID number from the PHS 20a, and decrypts the ID encrypted data. I do. The subsequent operation is the same as the operation shown in b. The above is the operation in the present embodiment.

As described above, in the present embodiment, PH
The encrypted music data and the encryption key encrypted by the ID number of S20a are stored in the memory card 40. Therefore, in addition to playing back the music data using the music playback device 30a to which the music data has been distributed,
Using the memory card 40, the music data can be reproduced by another music reproducing device. That is, after music data is received by a certain music reproducing device and written into a memory card, the PHS and the memory card are carried around, and the music data in the memory card can be reproduced by another music reproducing device. Therefore, convenience can be improved.

The ID stored in the memory card 40
The encrypted data is the PHS2 that received the distribution of the music data.
PHS because it is encrypted with ID number 0a
Only the owner of 20a can play the music data stored in the memory card 40. Therefore, there is an advantage that the copyright of the music data can be protected. In this way, the PHS 20a and the music playback device 30a cooperate to realize a function of preventing music data from being duplicated. The function of preventing music data from being copied by the above configuration is referred to as a “first copy prevention function”.

Here, the configuration for preventing copying of music data is not limited to the one described above, and may be, for example, as follows. That is, when receiving the encrypted music data and the encryption key from the music data distribution center 10, the PHS 20a transmits the encrypted music data to the music reproducing device 3.
0 and the encryption key is stored in the storage unit 201 of the PHS 20a. On the other hand, the control unit 301 in the music playback device 30a writes the encrypted music data received from the PHS 20a into the storage unit 302. Then, when an instruction to reproduce music data is given, the control unit 301 in the music reproduction device 30a outputs a signal for requesting an encryption key corresponding to the specified music data to the PHS 20a. Upon receiving this signal, the control unit 201 in the PHS 20a reads the requested encryption key from the storage unit 202, and outputs it to the music playback device 30a. When receiving the encryption key, the control unit 301 in the music playback device 30a outputs the encrypted key to the decryption unit 304 together with the encrypted music data requested to be played back. The following operation is the same as the operation shown in b.

On the other hand, when an instruction to write music data to the memory card 40 is given by the operation of the operation unit 303, the control unit 301 in the music playback device 30 a sends the encrypted music data Is read and written to the memory card 40.

In such a case, similarly to the above embodiment,
Only the owner of the PHS 20a in which the encryption key is stored,
Since music data can be reproduced, copyright can be protected. Hereinafter, the function of preventing music data from being copied in this manner is referred to as a “second copy prevention function”.

B: Second Embodiment Next, a second embodiment of the present invention will be described. The configuration of the present embodiment is the same as the configuration of the first embodiment shown in FIG. However, in the present embodiment, the storage unit 302 in the music playback device 30a in the above embodiment
Is stored in the storage unit 202 in the PHS 20b.

The operation of this embodiment is as follows.
That is, when a predetermined operation is performed on the operation unit 205 of the PHS 20b and a music data distribution instruction is given, P
The control unit 201 in the HS 20b activates the browser stored in the storage unit 202, establishes a call connection with the music data distribution center 10, and transmits a music data distribution request to the music data distribution center 10. The music data distribution center 10 transmits the encrypted music data and the encryption key in accordance with the distribution request to the ISDN, as in the first embodiment.
The data is transmitted to the PHS 20b via the network. The wireless unit 203 in the PHS 20b receives this data via the antenna and outputs the data to the control unit 201. The control unit 201 in the PHS 20b uses the ID number stored in the storage unit 202
The received encrypted music data and the encryption key are encrypted, and the obtained ID encrypted data is transmitted to the interface 207.
Playback device 30b via a cable 50 connected to the
Output to The following operation is the same as in the above embodiment.
In the present embodiment, the same effects as in the first embodiment can be obtained. In the present embodiment, the second copy protection function can be applied as a means for preventing the copy of the encrypted music data and the encrypted data.

C: Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG. 2, the same reference numerals are given to parts common to the respective parts shown in FIG.

In each of the above embodiments, the PHS 20a
And the music reproducing device 30a exchange various information via the cable 50. On the other hand, in the present embodiment, the PHS 20c and the music reproducing device 30c exchange data via the memory card 40. That is, the music data received by the PHS 20c is stored in the memory card 40 attached to the PHS 20c.
The music data is reproduced by the music reproducing device 30c to which the memory card 40 is attached.

As shown in FIG. 2, the PHS 20c includes a memory card interface 209 to which the memory card 40 can be connected, instead of the interface 207 in the first and second embodiments. On the other hand, the storage unit 20
2 stores the above-described browser, and the control unit 20
1 acquires encrypted music data and an encryption key by using the browser. The control unit 201 stores the acquired data in the storage unit 2 in the same manner as in the first embodiment.
02 is subjected to an encryption process using the ID number stored.
The memory card 40 connected to the memory card interface 209 stores the ID encrypted data thus obtained. Further, the PHS 20c in the present embodiment
Includes a signal transmission unit 210. This signal transmission unit 2
10 transmits an infrared signal corresponding to the ID number of the PHS 20c under the control of the control unit 201.

On the other hand, the music reproducing device 3 in the present embodiment
Reference numeral 0c denotes an apparatus for reproducing music based on data stored in the memory card 40. The music reproducing device 30c includes a signal receiving unit 311 in addition to the components in the music reproducing device 30c according to the first embodiment shown in FIG. The signal receiving unit 311 performs the above P
The infrared signal transmitted from the signal transmission unit 210 of the HS 20c is received, and a digital signal obtained by demodulating the signal, that is, a signal representing the ID number of the PHS 20c is output to the control unit 301.

Next, the operation of this embodiment will be described. First, when a predetermined operation is performed on the operation unit 205 of the PHS 20c and an instruction to request music data is given, the control unit 201 accesses the music data distribution center 10 using a browser as in the above-described embodiments. Receiving the encrypted music data and the encryption key. Subsequently, the control unit 201 stores the received data in the storage unit 202.
In addition to performing the encryption process using the ID number stored in the memory card 40, the obtained ID encrypted data is written to the memory card 40.

In order to reproduce the music data stored in the memory card 40 by the music reproducing device 30c, the user removes the memory card 40 from the PHS 20c and mounts the memory card 40 on the music reproducing device 30c.

Prior to reproducing the ID-encrypted data stored in the memory card 40 by the music reproducing device 30c, the user performs a predetermined operation on the operation unit 205 of the PHS 20c, and stores the ID number of the PHS 20c in the music. An instruction for transmission is given to the playback device 30c. When the instruction to transmit the ID number is given, the control unit 201
Reads the ID number from the storage unit 202 and outputs it to the signal transmission unit 210. The signal transmitting unit 210 receives the received I
The carrier wave is modulated based on the D number, and the obtained infrared signal is transmitted. On the other hand, the signal receiving unit 312 in the music reproducing device 30c receives and demodulates the infrared signal,
The obtained ID number is output to the control unit 301. The control unit 301 stores the ID number in the storage unit 302.

Thereafter, the operation unit 30 of the music reproduction device 30c
When a predetermined operation is performed on music data 3 and a reproduction instruction of music data is given, the control unit 301 reads the ID encrypted data from the attached memory card 40 and changes the ID number stored in the storage unit 302. read out. Subsequently, the control unit 301 decrypts the ID encrypted data using the ID number, and outputs the obtained encrypted music data and the obtained encryption key to the decryption unit 304. The decryption unit 304 decrypts the encrypted music data using the encryption key, and outputs the obtained music data to the decompression unit 305. This music data is supplied to the decompression unit 305, the D / A conversion unit 306, and the amplifier 3
07, and is output as sound from the speaker 307 or the like.

According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the music reproduction device 30
c without connecting it to the PHS 20c.
There is an advantage that music data can be received only by the PHS 20c to which the 0 is attached. Further, the complexity of handling the cable 50 for connecting the PHS 20c and the music playback device 30c can be eliminated.

The above-described second copy protection function may be applied to this embodiment. The operation in this case is as follows. That is, the control unit 201 of the PHS 20c
Of the data received from the music data distribution center 10,
The encrypted music data is stored in the memory card 40, and the encryption key is stored in the storage unit 202 of the PHS 20c. When an instruction is given by a user prior to music data reproduction by the music reproduction device 30c, the PHS 20c
The control unit 201 reads the encryption key stored in the storage unit 202 and transmits it from the signal transmission unit 210. on the other hand,
The control unit 301 in the music playback device 30c includes the signal receiving unit 3
11 writes the encryption key received by the storage unit 302 into the storage unit 302. Then, at the time of music reproduction, the control unit 303 reads out the encrypted music data from the memory card 40 and the encryption key from the storage unit 302, and outputs them to the decryption unit 304. The subsequent operation is the same as in the above embodiment.

D: Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG. 3, the same reference numerals are given to the same parts as those shown in FIGS. 1 and 2 and the description thereof will be omitted.

In the present embodiment, the browser is stored in the storage unit 202 of the PHS 20a as in the second embodiment. Further, as shown in FIG.
A decoding unit 208 similar to the decoding unit 304 provided in the music playback device 30a in the embodiment is provided in the PHS 20d.

The operation in this embodiment is as follows. First, when a predetermined operation is performed on the operation unit 205 of the PHS 20 d and an instruction of a music data distribution request is given, the control unit 201 in the PHS 20 d
As in the embodiment, the music data distribution center 10 is accessed by the browser to receive the encrypted music data and the encryption key. The control unit 201 outputs the received data to the decoding unit 208. The decrypting unit 208 decrypts the encrypted music data using the received encryption key, and outputs the resulting music data to the control unit 201.
Next, the control unit 201 reads the ID number from the storage unit 202 and performs an encryption process on the music data received from the decryption unit 208 using the ID number. Then, the control unit 201 transmits the obtained music data (that is, music data encrypted only by the ID number; hereinafter, referred to as “ID music data”) via the cable 50 connected to the interface 207. Output to the music playback device 30d. The control unit 301 in the music playback device 30d stores the ID music data received from the PHS 20d via the cable 50 in the storage unit 302.

On the other hand, the operation unit 303 of the music reproducing device 30d
When a predetermined operation is performed and an instruction to reproduce music data is given, the control unit 301 transmits an ID number request to the PHS 20d. Then, in response to the request, the ID number transmitted from the control unit 201 of the PHS 20d is received, and the storage unit 20 is used by using the ID number.
2 to decode the ID music data stored in
Output to The following operation is the same as in the first embodiment.

When a predetermined operation is performed on the operation unit 303 and an instruction to write music data to the memory card 40 is given, the control unit 3 in the music reproduction device 30d receives the instruction.
01 reads out the ID music data stored in the storage unit 302 and writes it to the memory card 40. As described above, also in the present embodiment, the same effects as those of the above embodiments can be obtained.

E: Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG. 4, the same reference numerals are given to parts common to the respective parts shown in FIGS.
The description is omitted.

As shown in FIG. 4, in the present embodiment, a decoding unit 208 similar to the decoding unit 304 provided in the music playback device 30c in the third embodiment is provided.
The configuration is provided in the PHS 20e.

The operation in this embodiment is as follows. First, the control unit 201 of the PHS 20e accesses the music data distribution center 10 using a browser, receives the encrypted music data and the encryption key, and outputs these data to the decryption unit 208. Decoding section 208
Decrypts the encrypted music data using the received encryption key, and outputs the resulting music data to the control unit 201. Subsequently, the control unit 201 reads the ID number from the storage unit 202, performs encryption processing using the ID number on the received music data, and obtains the ID music data (encrypted only by the ID number) obtained as a result. Music data) is written to the memory card 40.

On the other hand, the ID stored in the memory card 40
When reproducing music data, the user inserts the memory card 40 storing the ID music data into the music reproducing device 30.
e is attached to the memory card interface 311. Here, when a predetermined operation is performed on the operation unit 205 of the PHS 20e and an ID number transmission instruction is given, the fourth operation is performed.
An infrared signal indicating an ID number is transmitted from the signal transmission unit 210 as in the embodiment. This infrared signal is received and demodulated by the signal receiving device 311 in the music reproducing device 30e, and the ID number obtained as a result is written in the storage unit 302.

Next, when a predetermined operation is performed on the operation unit 305 and a music data reproduction instruction is given, the control unit 3
01 reads out the ID music data from the memory card 40 and the ID number from the storage unit 302,
The ID music data is decoded by the number, and the music data obtained as a result is output. This music data is stored in the decompression unit 3
05, and is output as sound from the speaker 308 or the like via the D / A conversion unit 306 and the amplifier 307. In the present embodiment, the same effects as in the fourth embodiment can be obtained.

F: Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG.
The description is omitted.

In each of the above embodiments, the PHS2
0 to the music playback device 30
To play. On the other hand, in the present embodiment, the PHS 20f itself has a music playback function.

As shown in FIG. 5, P in the present embodiment
The HS 20f is a PHS 20a according to the first embodiment.
, A decoding unit 208, a decompression unit 211, a D / A conversion unit 212, an amplifier 213, a speaker 214, and a headphone 215. These units are respectively a decoding unit 304, a decompression unit 305, a D / A conversion unit 306, an amplifier 307, a speaker 308, and a headphone 309 in the music playback device 30a according to the first embodiment.
It has the same function as. Also, this PHS2
0f has an interface 207. Control unit 20
Reference numeral 1 denotes another music reproducing apparatus 30 via a cable (indicated by a broken line in the figure) 50 connected to the interface 207.
It is also possible to exchange information with f.
That is, in the present embodiment, not only can music data be received and reproduced by the PHS 20f, but another music reproduction device 30f can be connected to the PHS 20f via the cable 50, and music can be reproduced by the music reproduction device 30f. You can also do it.

The operation in the present embodiment is as follows. When a predetermined operation is performed on the operation unit 205 of the PHS 20f and a music data request instruction is given, the control unit 2
01 accesses the music data distribution center 10 via a browser, receives the encrypted music data and the encryption key, and outputs them to the decryption unit 208. Decryption unit 20
8 decrypts the encrypted data with the encryption key supplied from the control unit 201 and outputs the obtained music data. The control unit 201 writes the music data output from the decoding unit 208 to the storage unit 202. On the other hand, the operation unit 205
When a predetermined operation is performed and a music data reproduction instruction is given, the control unit 201 reads the music data stored in the storage unit 202 and outputs the music data to the decompression unit 211. The expansion unit 211 expands and outputs the music data supplied by the control unit 201. The music data output from the expansion unit 211 is output as sound from the speaker 214 and the headphone 215 via the D / A conversion unit 212 and the amplifier 213.

On the other hand, with the music playback device 30f connected to the PHS 20f via the cable 50,
When a predetermined operation is performed on the operation unit 205 of f, P
The control unit 201 of the HS 20f reads the music data stored in the storage unit 202 and performs an encryption process on the music data using the ID number stored in the storage unit 202. Then, the control unit 201 outputs the obtained ID music data to the music reproducing device 30f via the cable 50 connected to the interface 207.
Upon receiving the ID music data, the control unit 301 in the music playback device 30f writes the ID music data into the storage unit 302.

Here, the operation unit 30 of the music reproducing device 30f
When a predetermined operation is performed on music data 3 and a music data reproduction instruction is given, the control unit 301 sends an instruction to the PHS 20f.
Send a D number request. The control unit 201 in the PHS 20f that has received this request via the cable 50 reads the ID number from the storage unit 202 and outputs it to the music playback device 30f.

The music reproducing device 3 that has received this ID number
0f, the control unit 301 stores the I
In addition to reading out the D music data, these data are decoded using the ID number, and the resulting music data is output to the decompression unit 305. This music data is output from the speaker 308 or the like via the expansion unit 305, the D / A conversion unit 306, and the amplifier 307. The storage unit 3
02 stored in the memory card 40
May be stored. This makes it possible to use this memory card 40 to play music by another music playback device connected to the PHS 20f. According to the present embodiment, music can be reproduced by the PHS 20f without separately preparing a music reproduction device, and thus there is an advantage that portability can be improved. In addition to the music reproduction by the PHS 20f, music data can be reproduced by using another music reproduction device, so that the convenience can be improved.

G: Seventh Embodiment Next, a seventh embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG. 6, a part common to each part shown in FIGS.
The description is omitted.

In the present embodiment, music data can be reproduced using the PHS 20g as in the sixth embodiment. Further, in the present embodiment, PHS2
In addition to storing the music data received by the memory card 0g in the memory card 40, the music data stored in the memory card 40 can be reproduced using another music reproducing device 30g.

As shown in FIG. 6, P
HS20g is the PHS of the sixth embodiment shown in FIG.
A memory card interface 209 to which the memory card 40 can be connected instead of the interface 207 of 20f
It has. On the other hand, the music playback device 30g also includes a memory card interface 311 to which the memory card 40 can be connected. Further, similarly to the fifth embodiment shown in FIG. 4, the PHS 20g controls the signal transmission unit 210 to
Each of the music reproducing devices 30g includes a signal receiving unit 311.

In such a configuration, when the music data distribution instruction is given by the user and when the PHS 20
When an instruction for music data reproduction by g is given, the same operation as in the sixth embodiment is performed, and music is reproduced from the speaker 214 and the like.

On the other hand, when a predetermined operation is performed on the operation unit 205 with the memory card 40 connected to the memory card interface 208 of the PHS 20g, the P
The control unit 201 of the HS 20g reads out the music data stored in the storage unit 202 and performs an encryption process on the music data using the ID number stored in the storage unit 202. Then, the control unit 201 writes the ID music data obtained as a result to the memory card 40.

Here, when a predetermined operation is performed on the operation unit 205 of the PHS 20g and an ID number transmission instruction is given, an infrared signal representing an ID number is transmitted from the signal transmission unit 210 as in the fourth embodiment. At the same time, the infrared signal is received and demodulated by the signal receiving device 312 in the music reproducing device 30g, and the ID number is stored in the storage unit 302.
Is written to.

Further, when the memory card 40 is connected to the memory card interface 311 of the music playback device 30g, a predetermined operation is performed on the operation unit 303 of the music playback device 30g, and a music data playback instruction is given. The control unit 301 reads the ID music data from the memory card 40 and the ID number from the storage unit 302, decodes the ID music data with the ID number, and outputs the music data obtained as a result. This music data is supplied to the decompression unit 305, the D / A conversion unit 306, and the amplifier 3
The sound is output as a sound from the speaker 308 or the like via the switch 07. In the present embodiment, the same effects as in the sixth embodiment can be obtained.

H: Eighth Embodiment Next, an eighth embodiment of the present invention will be described with reference to FIG. In addition, in each part shown in FIG. 7, a part common to each part shown in FIGS.
The description is omitted.

In the present embodiment, an MD (Mini Disk) reproducing device 60 can be connected via a cable 50 to the PHS 20h having the same configuration as in the first embodiment.

The PHS 20h has the same components as those of the PHS 20a in the first embodiment shown in FIG.
It has a compression method conversion unit 216 for converting the compression method of music data. As described above, the music data distributed from the music data distribution center is compressed according to the MP3 method. The compression method conversion unit 216 converts the music data into an ATR compatible with the MD reproducing apparatus 60.
The data is converted into data compressed by the AC method and output.

The MD reproducing apparatus 60 includes a control section 601 for controlling each section, an optical pickup and a magnetic head, and outputs information read from the MD 603 and reproduces the supplied information on the MD 603. A recording unit 602, a decompression unit 604 for decompressing music data compressed by the ATRAC method, a D / A conversion unit 605 for converting a digital signal output from the decompression unit 604 into an analog signal, an amplifier 606, and a speaker 60
7 and headphones 608 and the MD playback device 60
Is connected to the PHS 20h via the cable 50.

The operation in this embodiment is as follows. First, as in the above embodiments, the control unit 201 which has received the encrypted music data and the encryption key from the music data distribution center 10 converts these data into the decryption unit 2.
08. The decryption unit 208 decrypts the encrypted music data using the received encryption key, and converts the resulting music data to the compression format conversion unit 2 via the control unit 201.
16 is output. The compression format conversion unit 216 outputs the MP3
The music data compressed by the system is expanded, and the music data is compressed by the ATRAC system and output to the control unit 201. Next, the control unit 201
In addition to reading the number, the music data received from the compression format conversion unit 216 is subjected to encryption processing using the ID number, and the resulting ID music data is output to the MD playback device 60 via the cable 50. I do. This I
The D music data is supplied to the playback / recording unit 602 by the control unit 601 in the MD playback device 60, and is recorded on the MD 603 by the playback / recording device 602.

On the other hand, when a predetermined operation is performed on an operation unit (not shown) of the MD reproduction device 60 and a music data reproduction instruction is given, the control unit 601 transmits an ID number request to the PHS 20h. Then, the ID number transmitted from the control unit 201 of the PHS 20h in response to this request is received. On the other hand, the reproduction / recording unit 602
Under the control of 1, the music data recorded on the MD 603 is read and output to the control unit 601. Control unit 601
Decrypts the ID music data supplied from the reproducing / recording unit 602 using the ID number transmitted from the PHS 20h, and outputs the resulting music data to the decompression unit 604. The decompression unit 604 decompresses and outputs the music data compressed by the ATRAC method. The output music data is output as sound by a speaker 607 or the like via a D / A converter 605 and an amplifier 606.

I: Ninth Embodiment Next, a ninth embodiment of the present invention will be described with reference to FIG. In addition, in each part illustrated in FIG. 8, the same reference numerals are given to parts common to the respective parts illustrated in FIGS.
The description is omitted.

In this embodiment, an adapter 70 is interposed between the PHS 20i and the music reproducing device 30i. That is, the PHS 20i and the adapter 70
Are connected via a cable 51, and the adapter 70 and the music playback device 30 i are connected via a cable 52.

The adapter 70 includes a control unit 701, a storage unit 702, a decoding unit 703, and interfaces 704 and 705. The control unit 701
The operation of the adapter 70 is controlled according to various programs stored in the storage unit 702. Also, the storage unit 702 has a browser for accessing the music data distribution center 10 and receiving the encrypted music data and the encryption key.
And an ID number of the adapter 70 (corresponding to “encryption key for adapter” in the claims). The decoding unit 703 has the same function as the decoding unit 304 or 208 in each embodiment described above. The storage unit 202 of the PHS 20i and the music player 3
The browser is not stored in the storage unit 302 of 0i.

In such a configuration, when a predetermined operation is performed on the operation unit (not shown) of the adapter 70 and a music data reception instruction is given, the control unit 7 of the adapter 70 is controlled.
01 starts the browser, accesses the music data distribution center 10 via the PHS 20i, and transmits a music data distribution request. Further, the control unit 701 transmits the encrypted music data and the encryption key distributed from the music data distribution center 10 in response to the music data distribution request to the PHS 20i.
Receive through. Next, the control unit 701 outputs the received data to the decoding unit 703. Decoding section 703
Decrypts the encrypted music data using the received encryption key, and outputs the resulting music data to the control unit 701. The control unit 701 reads the ID number from the storage unit 702, performs encryption processing using the ID number on the music data received from the decryption unit 703, and transmits the resulting ID music data to the cable 52. The music data is output to the music playback device 30i. Music playback device 3
The control unit 301 in 0i writes the received ID music data in the storage unit 302.

On the other hand, the operation unit 303 of the music reproducing device 30i
Is performed and a music data playback instruction is given, the control unit 303
Send a D number request. Then, in response to the request, the ID number transmitted from the control unit 701 of the adapter 70 is received, and the storage unit 302 is used by using the ID number.
And decodes the ID music data stored therein, and outputs the obtained music data. This music data is stored in a decompression unit 305, D
The sound is output as sound by the speaker 308 or the like via the / A conversion unit 306 and the amplifier 307.

On the other hand, the operation unit 303 of the music playback device 30i
Is performed, and an instruction to write music data to the memory card 40 is given, the control unit 301 in the music playback device 30i reads the ID music data stored in the storage unit 302, and It is stored in the card 40.

J: Modifications Although one embodiment of the present invention has been described above, the above embodiment is merely an example, and various modifications may be made to the above embodiment without departing from the spirit of the present invention. be able to. For example, the following modifications can be considered.

<Modification 1> PHS 20 and music playback device 3
In the case where the transmission and reception of information between 0 and 0 is performed via the memory card 40, that is, in the fourth, fifth, and seventh embodiments, in order to prevent music data from being copied, the following third method is used. Card 4 with copy protection function
1 may be used. FIG. 9 is a block diagram showing the configuration of the memory card 41.

As shown in FIG.
Is a non-volatile memory 411 for storing music data output from the PHS 20, and, when the music data stored in the non-volatile memory 411 is encrypted, the music data is decrypted and compressed. A decoding / decompression unit 412 for expanding and outputting music data, a D / A conversion unit 413 for converting the music data output from the decoding / decompression unit 412 into an analog signal, and for controlling operation timings of these units. , An interface 416 for connecting the memory card 41 to the PHS 20, and an interface 417 for connecting the memory card 41 to the music playback device 30. The memory card 41 is supplied with power from the connected PHS 20 or music playback device 30.

When the memory card 41 having such a configuration is used instead of the memory card 40 shown in the fourth, fifth, and seventh embodiments, the PHS 20d, 20e shown in FIGS. 3, 4, and 6 is used. And signal transmission unit 210 in music playback devices 30d, 30e and 3
0g signal receiving unit 311, decoding unit 304, decompressing unit 30
5 and the D / A converter 306 become unnecessary. That is,
The control unit 301 in the music playback device 30 includes an amplifier 307
, And the speaker 308 and the headphone 309 are connected to each other.

Here, when this memory card 41 is used in the fourth embodiment, the operation of each unit is as follows. First, upon receiving the encrypted music data and the encryption key distributed from the music data distribution center 10, the control unit 201 of the PHS 20d transmits these data to the memory card 4 via the memory card interface 209.
Output to 1. Thus, the encrypted music data and the encryption key are stored in the nonvolatile memory 411 in the memory card 41.

Next, when a music data reproducing instruction is given to the music reproducing apparatus 30d in which the memory card 41 is mounted, the control section 301 sends a predetermined timing to the timing control section 414 in the memory card 41. Clocks are sequentially output. The timing control unit 414 controls each unit in the memory card 41 according to the timing clock. That is, the decryption / decompression unit 412 reads the encrypted music data and the encryption key stored in the nonvolatile memory 411, decrypts the encrypted music data with the encryption key, and decompresses the obtained music data. And output. This music data is supplied to the D / A converter 413
After that, the signal is converted into an R channel and L channel analog signal, and then output to the music reproducing device 30 d via the interface 417. This analog signal is output to the amplifier 307 by the control unit 301 in the music playback device 30d, amplified, and output as sound from the speaker 308 or the like.

Next, the operation when the memory card 41 is used in the fifth and seventh embodiments will be described. First, upon receiving the encrypted music data and the encryption key distributed from the music data distribution center, the control unit 201 in the PHS 20 decodes these data into the decryption unit 20.
8 is output. The decryption unit 208 decrypts the encrypted music data using the encryption key, and outputs the obtained music data to the control unit 201. The control unit 201 stores the music data in the nonvolatile memory 411 in the memory card 41.

Next, when a music data reproduction instruction is given to the music reproduction device 30 in which the memory card 41 is mounted, the timing control unit 414 in the memory card 41
Controls each unit in the memory card 41 according to the timing clock supplied from the music playback device 30. That is, the decoding / decompression unit 412 decompresses and outputs the music data stored in the nonvolatile memory 411. This music data is converted into an analog signal by the D / A conversion unit 413 and then output to the music playback device 30 via the interface 417. This analog signal is output to the amplifier 307 by the control unit 301 in the music playback device 30 and amplified, and is output as sound from the speaker 308 or the like.

As described above, when the above-mentioned memory card 41 is used, music data as an analog signal is output from the memory card 41 in which music data (encrypted music data) is stored. The encrypted music data distributed from the music data distribution center 10 and the digital data exactly the same as the encryption key cannot be easily copied. Therefore, the copyright of the music data can be protected.

<Modification 2> In each of the above embodiments,
Although the PHS 20 is used as a means for communicating with the music data distribution center 10, the present invention is not limited to this.
For example, a mobile phone, an automobile phone, or the like can be used. That is, the “mobile device” in the claims is a concept including these various communication terminal devices.

<Modification 3> In each of the above embodiments,
When the music data distribution center 10 receives a music data distribution request, the music data distribution center 10 performs encryption processing on the music data, and distributes the encrypted music data and the encryption key obtained as a result. Not limited to this, for example,
Music data that has been subjected to encryption processing in advance (that is, encrypted music data) is stored in a music data memory in association with an encryption key used for the encryption processing, and a music data distribution request is received. In such a case, encrypted music data and an encryption key corresponding to the music data may be distributed.

<Modification 4> In the "first copy protection function" in each of the above embodiments, the ID number of the mobile device is used as the encryption key. The encryption key is not limited to this. That is, instead of the ID number of the mobile device also serving as the encryption key, an encryption key may be separately prepared for encryption processing in the mobile device.
That is, the “mobile device encryption key” in the claims is not limited to the ID number of the mobile device. Similarly, in the ninth embodiment, the adapter ID number is an example of the “adapter encryption key” in the claims, but is not limited to this.

[0091]

As described above, according to the present invention,
Since the music data can be reproduced by the music reproduction device that has received the distribution of the music data, there is an advantage that the convenience for the user can be improved. In addition, since the distributed music data is not only encrypted in advance, but also the PHS, the music playback device and the memory card are provided with a copy protection function, the copyright of the music data can be effectively protected. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a music data distribution system according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating an overall configuration of a music data distribution system according to a third embodiment of the present invention.

FIG. 3 is a block diagram illustrating an overall configuration of a music data distribution system according to a fourth embodiment of the present invention.

FIG. 4 is a block diagram illustrating an overall configuration of a music data distribution system according to a fifth embodiment of the present invention.

FIG. 5 is a block diagram showing an overall configuration of a music data distribution system according to a sixth embodiment of the present invention.

FIG. 6 is a block diagram illustrating an overall configuration of a music data distribution system according to a seventh embodiment of the present invention.

FIG. 7 is a block diagram showing an overall configuration of a music data distribution system according to an eighth embodiment of the present invention.

FIG. 8 is a block diagram showing an overall configuration of a music data distribution system according to a ninth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a memory card according to a modification of the present invention.

[Explanation of symbols]

1 ... simple mobile telephone station, 2 ... ISDN network, 10 ... music data distribution center, 20a, 20c, 20d, 20
e, 20f, 20g, 20h, 20i ... PHS, 30
a, 30c, 30d, 30e, 30f, 30g, 30i
... Music playback device, 40, 41 ... Memory card, 5
0, 51, 52 ... cable, 60 ... MD playback device,
70 adapters, 201, 301, 601, 701 ...
... Control unit, 202, 302, 702 ... Storage unit, 203
... Radio unit, 204, display unit, 205, 303, operation unit, 206, voice input / output unit, 207, 310, 41
6,417,704,705... Interface, 20
8, 304, 703: decoding unit, 209, 311: memory card interface, 210: signal transmission unit, 2
11, 305, 604... Extension part, 212, 306, 6
05: D / A converter, 213, 307, 606: amplifier, 214, 308, 607: speaker, 215
309, 608 headphone, 216 compression system converter, 312 signal receiver, 411 nonvolatile memory, 412 decoding / decompressor 413 D / A converter, 414 timing Control unit 602... Reproduction / recording unit 603... MD.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 7/26 109M (72) Inventor Mitsuhiro Kubota 2-1-1 Toranomon, Minato-ku, Tokyo NTT (72) Inventor Yoji Kaneda 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd. F-term (reference) 5B085 AE13 AE29 5B089 GA01 GA21 GA25 HA13 JA33 JB05 JB10 JB22 KA11 KA17 KB04 KB13 KH14 KH28 KH30 LB13 LB25 5J104 AA01 AA12 AA16 EA04 EA06 EA17 EA22 EA26 MA05 NA02 NA05 NA35 NA36 PA01 PA02 5K067 AA21 DD17 DD54 EE02 H11H11H23H11H23

Claims (42)

[Claims] 1. A music data distribution system comprising a music data distribution center, a mobile device, and a music playback device, wherein the music data distribution center receives a music data distribution request, and receives a music data distribution request. And a device for transmitting the encrypted data encrypted with the encryption key and the encryption key to a music data distribution request source. A connection unit for connecting to a data distribution center; and an encryption unit for performing an encryption process on the encrypted data and the encryption key using a mobile device encryption key and outputting the encrypted data and the encryption key to the music playback device. A request transmission unit for transmitting a distribution request for music data to the music data distribution center via the mobile device and a network, in response to the distribution request; Receiving means for receiving encrypted data and an encryption key of the music data transmitted from the music data distribution center via the network and the mobile device; output means for outputting the music data as sound; and the mobile device Means for writing the encrypted data and the encryption key encrypted by the encryption key for portable use to a portable storage medium, and the encrypted data and encryption encrypted from the portable storage medium by the encryption key for mobile unit. Reading means for reading an encryption key, obtaining the encryption key for the mobile device from the mobile device, and using the encryption key for the mobile device, the encrypted data and the encryption key received by the reception device or the encryption key. The decryption unit decrypts the encrypted data and the encryption key read by the reading unit, and decrypts the encrypted data using the encryption key. Music data distribution system characterized by comprising a decoding means for decoding easier data. 2. A music data distribution system comprising a music data distribution center, a mobile device, and a music playback device, wherein the music data distribution center receives a music data distribution request and responds to the music data. And a device for transmitting the encrypted data encrypted with the encryption key and the encryption key to a music data distribution request source. A connection unit that connects to a data distribution center; and a storage unit that sends the encrypted data transmitted from the music data distribution center to the music playback device and stores the encryption key. Request transmitting means for transmitting a distribution request for music data to the music data distribution center via the mobile device and the network; Receiving means for receiving the encrypted data of the music data transmitted from the music data distribution center via the network and the mobile device; output means for outputting the music data as sound; and portable storage of the encrypted data. Writing means for writing to a medium; reading means for reading the music data from a portable storage medium; obtaining the encryption key from the mobile device, using the encryption key, and receiving the music data by the receiving means. A music data distribution system comprising: decryption means for decrypting the encrypted data or the encrypted data read by the reading means. 3. A music data distribution system comprising a music data distribution center, a mobile device, and a music playback device, wherein the music data distribution center receives a music data distribution request, and receives a music data distribution request. And a device for transmitting the encrypted data encrypted by the encryption key and the encryption key to a music data distribution request source. The mobile device transmits the music to the music data distribution center via a network. Request transmission means for transmitting a data distribution request; and reception means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. The music playback device acquires the encrypted data and the encryption key received by the receiving unit of the mobile device, and uses the encryption key. A music data distribution system, comprising: a decryption unit for decrypting music data from the encrypted data; and an output unit for outputting the music data as sound. 4. The mobile device includes an encryption unit that performs an encryption process on the encrypted data and the encryption key using a mobile device encryption key, and the decryption unit of the music playback device includes: Obtaining the encrypted data and the encryption key encrypted by the encryption means of the mobile device and the encryption key for the mobile device, and using the encryption key for the mobile device to obtain the encrypted data and the encrypted data; The music data distribution system according to claim 3, wherein the key is decrypted, and the music data is decrypted from the encrypted data using the encryption key. 5. An encrypted data and an encryption key encrypted by the mobile device encryption key are sent to the music reproducing device via a cable connecting the mobile device and the music reproducing device. The music data distribution system according to claim 4, wherein 6. The decrypting means of the music reproducing apparatus converts the mobile device encryption key and the encrypted data and the encryption key encrypted by the mobile device encryption key by separate procedures. The music data distribution system according to claim 1, wherein the music data is acquired from the mobile device. 7. The mobile device, further comprising: writing means for writing the encrypted data and the encryption key encrypted by the mobile device encryption key to a portable storage medium; 5. The music data distribution system according to claim 4, further comprising a reading unit that reads information written on a portable storage medium. 8. The decrypting means of the music reproducing device acquires encrypted data and an encryption key encrypted by the mobile device encryption key from the reading means,
The music data distribution system according to claim 7, wherein the mobile device encryption key is obtained from the mobile device via a different path from the encrypted data and the encryption key. 9. The mobile device, further comprising: storage means for sending the encrypted data transmitted from the music data distribution center to the music reproducing device and storing the encryption key, and decrypting the music reproducing device. 4. The music data distribution system according to claim 3, wherein the means obtains the encryption key from the mobile device, and decrypts music data from the encrypted data using the encryption key. 10. The music data distribution system according to claim 9, wherein the encrypted data is sent to the music playback device via a cable connecting a mobile device and the music playback device. 11. The music according to claim 2, wherein the decryption means of the music reproducing apparatus acquires the encrypted data and the encryption key from the mobile device by separate procedures. Data distribution system. 12. The mobile device includes writing means for writing the encrypted data on a portable storage medium, and the music reproducing device reads the encrypted data written on the portable storage medium. The music data distribution system according to claim 7, comprising: 13. The decrypting means of the music reproducing apparatus acquires the encrypted data from the reading means and acquires the encryption key from the mobile device via a path different from the encrypted data. 2. The method according to claim 1, wherein
2. The music data distribution system according to 2. 14. A music data distribution center, a mobile device,
A music data distribution system comprising a music reproduction device, wherein the music data distribution center receives a music data distribution request, and encrypts the music data with an encryption key. Requesting means for transmitting a music data distribution request to the music data distribution center via a network, comprising: an apparatus for transmitting an encryption key to a music data distribution request source; Receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response thereto; and decrypting the music data from the encrypted data using the encryption key. Decrypting means for performing encryption processing on the music data using a mobile device encryption key; The raw device acquires the music data encrypted by the encryption unit of the mobile device and the mobile device encryption key,
A music data distribution system, comprising: decoding means for decoding the music data using the mobile device encryption key; and output means for outputting the music data as sound. 15. The music data encrypted by the mobile device encryption key is sent to the music playback device via a cable connecting the mobile device and the music playback device. 15. The music data distribution system according to 14. 16. The decrypting means of the music reproducing apparatus acquires the music data encrypted by the encrypting means of the mobile device and the encryption key for the mobile device by separate procedures. The music data distribution system according to claim 15, wherein 17. The mobile device, further comprising: writing means for writing music data encrypted by the mobile device encryption key to a portable storage medium, wherein the music playback device stores the music data in the portable storage medium. 14. The music data distribution system according to claim 13, further comprising a reading unit that reads the written music data. 18. The music reproducing apparatus according to claim 1, wherein the decryption unit acquires the music data encrypted by the mobile device encryption key from the reading unit, and stores the mobile device encryption key with the music data. 18. The music data distribution system according to claim 17, wherein the music data is acquired from the mobile device via different routes. 19. A music data distribution system comprising a music data distribution center and a mobile device connectable to a music reproduction device via a cable, wherein the music data distribution center receives a music data distribution request. A device for transmitting encrypted data obtained by encrypting the music data with an encryption key and the encryption key to a music data distribution request source; Request transmission means for transmitting a distribution request for music data to the music data distribution center; and receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for decrypting music data from the encrypted data using the encryption key; and A music data distribution system comprising: output means for outputting; and data transmission means for transmitting music data to the music playback device via the cable. 20. The mobile device, further comprising: encryption means for performing an encryption process on the music data using a mobile device encryption key, wherein the data transmission means performs encryption by the encryption means. 20. The music data distribution system according to claim 19, wherein the transmitted music data is sent to the music playback device via a cable. 21. A music data distribution system comprising a music data distribution center and a mobile device, wherein the music data distribution center receives a music data distribution request and encrypts the music data with an encryption key. And a device for transmitting the encrypted data and the encryption key to a music data distribution request source, wherein the mobile device transmits a music data distribution request to the music data distribution center via a network. Request transmitting means; receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request; and using the encryption key. Decryption means for decrypting music data from the encrypted data; output means for outputting the music data as sound; Music data distribution system reproducing apparatus characterized by comprising a writing means for writing in a readable portable storage medium. 22. The mobile device includes an encryption unit that performs an encryption process on the music data using a mobile device encryption key, and the writing unit encrypts the music data by the encryption unit. 22. The music data distribution system according to claim 21, wherein the music data is written into the portable storage medium. 23. A music data distribution center, a mobile device,
A music data distribution system comprising: a music reproduction device capable of reproducing music data compressed by a first compression method, wherein the music data distribution center receives a music data distribution request and performs a second compression A device for transmitting, to a music data distribution request source, encrypted data obtained by encrypting the music data compressed by an encryption method with an encryption key, and the music data distribution request source; Request transmission means for transmitting a distribution request of music data to the music data distribution center via the network; and transmitting encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request to the network. Receiving means for receiving music data from the encrypted data, decoding means for decoding music data from the encrypted data using the encryption key, Data conversion means for converting the data into music data compressed by the first compression method, and outputting the music data. The music reproducing apparatus further comprises: music output by the compression method conversion means of the mobile device. A music data distribution system comprising: decompression means for acquiring data and decompressing music data compressed by the first compression method; and output means for outputting the music data as sound. 24. The mobile device, further comprising: encrypting means for performing an encryption process on the music data using a mobile device encryption key, wherein the music reproducing apparatus includes an encrypting device of the mobile device. And a decryption unit for acquiring the music data encrypted by the mobile device and the encryption key for the mobile device, and decrypting the music data using the encryption key for the mobile device. 24. The music data distribution system according to 23. 25. A music data distribution center, a mobile device,
A music data distribution system including an adapter and a music playback device, wherein the music data distribution center receives the music data via a distribution request and performs encryption on the music data using an encryption key. A device that transmits the encrypted data and the encryption key to a music data distribution request source, wherein the mobile device has a connection unit that connects the adapter to the music data distribution center via a network; A request transmission unit for transmitting a distribution request of music data to the music data distribution center via the mobile device and the network; and an encryption of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving the encrypted data and the encryption key via the network and the mobile station; Decryption means for decrypting music data from encrypted data; encryption means for performing an encryption process on the music data using an encryption key for an adapter; and music data encrypted by the encryption means. A data transmission unit for sending to the music reproduction device, wherein the music reproduction device acquires the adapter encryption key from the adapter, and decrypts the music data using the adapter encryption key. A music data distribution system, comprising: an output unit that outputs the music data as a sound. 26. A music data distribution center, a mobile device,
A music data distribution system comprising a music reproduction device, wherein the music data distribution center receives a music data distribution request, and encrypts the music data with an encryption key. Requesting means for transmitting a music data distribution request to the music data distribution center via a network, comprising: an apparatus for transmitting an encryption key to a music data distribution request source; Receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response thereto; and encrypted data of the music data transmitted from the music data distribution center; Writing means for writing an encryption key to a portable storage medium, wherein the portable storage medium comprises: A non-volatile memory storing an encryption key, and an encryption key stored in the non-volatile memory,
Decryption means for decrypting music data from the encrypted data stored in the nonvolatile memory; and a D / D converter for converting the music data into an analog signal and outputting the analog signal.
A music data distribution system, comprising: A conversion means; and wherein the music reproduction device includes output means for outputting the analog signal as sound. 27. A music data distribution center, a mobile device,
A music data distribution system comprising a music reproduction device, wherein the music data distribution center receives a music data distribution request, and encrypts the music data with an encryption key. Requesting means for transmitting a music data distribution request to the music data distribution center via a network, comprising: an apparatus for transmitting an encryption key to a music data distribution request source; Receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response thereto; and decrypting the music data from the encrypted data using the encryption key. Decoding means, and writing means for writing the music data to a portable storage medium, wherein the portable storage medium stores the music data. And a D / A converter for converting music data stored in the non-volatile memory into an analog signal and outputting the analog signal. The music playback device outputs the analog signal as sound A music data distribution system, comprising: 28. A music data distribution system comprising a music data distribution center and a mobile device, wherein the music data distribution center receives a music data distribution request and encrypts the music data with an encryption key. And a device for transmitting the encrypted data and the encryption key to a music data distribution request source, wherein the mobile device transmits a music data distribution request to the music data distribution center via a network. Request transmitting means, receiving means for receiving, via the network, encrypted data and an encryption key of the music data transmitted from the music data distribution center in response to the distribution request, and using the encryption key. A decoding unit for decoding music data from the encrypted data; and an output unit for outputting the music data as sound. The storage medium includes: a non-volatile memory that stores the music data; and a D / D converter that converts the music data stored in the non-volatile memory into an analog signal that can be reproduced by a music reproduction device equipped with the portable storage medium. A music data distribution system comprising A conversion means. 29. A mobile device comprising means for holding a portable storage medium in a detachable manner and writing information received via a wireless channel to the portable storage medium. 30. Request transmitting means for transmitting a distribution request of music data to a music data distribution center via a network, and encrypted data and encryption of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network; encryption means for performing encryption processing on the encrypted data and the encryption key using a mobile device encryption key; and encryption for the mobile device. A mobile device comprising: data transmission means for transmitting encrypted data and an encryption key encrypted by a key to a music playback device connected via a cable. 31. Request transmitting means for transmitting a distribution request of music data to a music data distribution center via a network, and encrypted data and encryption of the music data transmitted from the music data distribution center in response to the distribution request. A mobile device comprising: receiving means for receiving an encryption key via the network; and data transmitting means for transmitting the encrypted data to a music playback device connected via a cable. 32. Request transmitting means for transmitting a distribution request of music data to a music data distribution center via a network, and encrypted data and encryption of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network; encryption means for performing encryption processing on the encrypted data and the encryption key using a mobile device encryption key; and encryption for the mobile device. Writing means for writing encrypted data and an encryption key encrypted by a key to a portable storage medium; 33. Request transmitting means for transmitting a distribution request of music data to a music data distribution center via a network, and encrypted data and encryption of the music data transmitted from the music data distribution center in response to the distribution request. A mobile device comprising: receiving means for receiving an encrypted key via the network; and writing means for writing the encrypted data to a portable storage medium. 34. Request transmitting means for transmitting a distribution request for music data to a music data distribution center via a network, and encrypted data and encryption of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network; decryption means for decrypting music data from the encrypted data using the encryption key; and using a mobile device encryption key for the music data. A mobile device comprising: encryption means for performing an encryption process. 35. The mobile device according to claim 34, further comprising a data transmission unit that sends the music data encrypted by the encryption unit to a music playback device connected via a cable. 36. The mobile device according to claim 34, further comprising a writing unit that writes the music data encrypted by the encryption unit to a portable storage medium. 37. A mobile device connectable to a music reproducing device via a cable, request transmission means for transmitting a distribution request for music data to the music data distribution center via a network, Receiving means for receiving the encrypted data and the encryption key of the music data transmitted from the music data distribution center via the network; and decrypting the music data from the encrypted data using the encryption key. A mobile unit comprising: an output unit that outputs the music data as a sound; and a data transmission unit that sends the music data to the music playback device via the cable. 38. The mobile device according to claim 37, further comprising an encryption unit that performs an encryption process on the music data using a mobile device encryption key. 39. Request transmitting means for transmitting a distribution request of music data to the music data distribution center via a network, and encrypted data of the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving an encryption key via the network; decryption means for decrypting music data from the encrypted data using the encryption key; output means for outputting the music data as sound; Writing means for writing data to a portable storage medium readable by a music reproducing device. 40. An encryption unit for performing an encryption process on the music data using a mobile device encryption key, wherein the writing unit writes the music data encrypted by the encryption unit. 40. The mobile device according to claim 39, wherein data is written to the portable storage medium. 41. A mobile device connectable to a music reproducing device capable of reproducing music data compressed by a first compression method, wherein the mobile device sends a music data distribution request to the music data distribution center via a network. Request transmitting means, and receiving means for receiving, via the network, encrypted data and an encryption key of the music data compressed by the second compression system transmitted from the music data distribution center in response to the distribution request. Decoding means for decoding music data from the encrypted data using the encryption key; and compression method conversion means for converting the music data into music data compressed by the first compression method. A mobile device characterized by: 42. A request transmitting means for transmitting a distribution request for music data to a music data distribution center via a mobile device and a network, and encrypting the music data transmitted from the music data distribution center in response to the distribution request. Receiving means for receiving data and an encryption key via the network and the mobile device; decryption means for decrypting music data from the encrypted data using the encryption key; A music data receiving adapter, comprising: an encrypting means for performing an encryption process using an encryption key; and a data transmitting means for transmitting the music data encrypted by the encrypting means to the music reproducing apparatus. .