JP2005304006A - Electronic music instrument and computer readable program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the decode of encryption difficult and enhance the protect of music contents in an electronic music instrument, in which the music contents can be enciphered and recorded in a desired recording medium out of a plurality of kinds of media. <P>SOLUTION: Media IDs (MD1, MD2, MD3, MD4 and MD5) are matched with a memory card 8, a hard disk device 10, a flash memory ROM 11, a CD-ROM 12, and the Internet 15. Each medium ID is enciphered and recorded in different positions of the ROM 2. At the reading of the music contents, the media ID of a corresponding recording medium is decoded, and the contents are decoded based on the medium ID and a secret key and stored temporarily in a RAM 3. At the time of writing, the contents are enciphered based on the medium ID corresponding to the recorded medium and the secret key, and the contents of the RAM 3 are deleted. In this way, the decode of the encryption in the electronic music instrument can be made difficult and the protection of the music contents can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is capable of accessing a plurality of types of recording media, reading music content recorded in an encrypted manner from any one of the plurality of types of recording media, and any one recording medium The present invention relates to an electronic music apparatus capable of encrypting and recording music content, and a computer-readable program applied to the apparatus.

  2. Description of the Related Art Conventionally, electronic music devices such as electronic musical instruments that perform automatic performance based on music data (performance data) composed of MIDI data are widely known. In addition, in an electronic musical instrument, a memory card such as a smart media (registered trademark) is adopted as an external storage medium, and MIDI music data stored in advance is read from the memory card and automatically played or edited by a user. There is one in which MIDI music data that has been made or composed can be stored in a memory card. Also, when MIDI music data that requires copyright protection (hereinafter referred to as “music content”) is read from an external recording medium or the like into the electronic musical instrument, management information including a copyright flag in the music content. To protect copyrights to prevent illegal copying.

  By the way, CPUs employed in electronic musical instruments are becoming faster every year, and HD (hard disk), flash memory ROM, CD-ROM / R / RW drive, etc. are built in or via an interface such as USB. It has become possible to connect and various recording media can be used for electronic musical instruments. If such a plurality of types of recording media can be used, various software and various contents can be used, and the function of the electronic musical instrument can be enhanced. The music content can also be recorded on these various recording media according to the user's preference and the like. In such a case, it is necessary to consider the copyright protection of the music content.

From the viewpoint of such copyright protection, a technique for encrypting music data is disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-208163. In this prior art, music data is distributed via a network, and the music data is taken into an electronic musical instrument for automatic performance and the like (a secret key) so that the music data for trial listening cannot be used illegally. Is used to encrypt music data.
JP 2003-208163 A

  When a secret key is used for encryption as described above, the secret key is required even when decrypting. For example, in an electronic musical instrument used as an individual device (stand-alone), the secret key is stored in the electronic musical instrument. It is necessary to memorize it. In addition, when encrypting music content stored on each of a plurality of types of recording media, it is easier to use a common secret key to simplify the processing program, etc. Once the secret key is found, There is a problem that the strength of protection is weak, such as the music content on the recording medium being easily decrypted and thus allowing illegal copying.

  In order to cope with the above problem, the present invention can access a plurality of types of recording media, read out music content encrypted and recorded on any one of the plurality of types of recording media, or It is an object of the present invention to make it difficult to decipher the encryption and to enhance the strength of protection of music contents in an electronic music device that can be encrypted and recorded on the same recording medium.

  By executing the electronic music device according to claim 1 or the computer-readable program according to claim 11 on a computer, a media ID corresponding to a recording medium for which reading of music content is designated from the storage means (storage device) is obtained. The acquired music content is read out from the recording medium, and the encrypted music content is decrypted using the acquired media ID. As a result, the encrypted music content cannot be decrypted unless the media ID corresponding to the recording medium on which the music content is recorded cannot be acquired.

  According to a second aspect of the present invention, there is provided an electronic music apparatus according to the first aspect, wherein a common secret key and the medium are stored from a storage device for encrypted music content including encrypted common key information independent of a recording medium type. An ID is acquired, the common key information is decrypted using the common secret key, a decryption key is generated using the common key information and the acquired media ID, and encryption is performed using the generated decryption key. Decrypted music content. This complicates the decoding procedure.

  According to a third aspect of the present invention, there is provided an electronic music apparatus according to the first aspect, wherein the encrypted music data representing the music, the encrypted music data key for decrypting the encrypted music data, and the type of the recording medium Obtains a common secret key and the media ID from storage means for encrypted music content including independent encrypted common key information, decrypts the common key information using the common secret key, and A decryption key is generated using the common key information and the acquired media ID, the music data key is decrypted using the generated decryption key, and included in the music content using the decrypted music data key The song data to be decoded is now decrypted. This complicates the decoding procedure.

  By executing the electronic music device according to claim 4 or the computer-readable program according to claim 12 on a computer, a media ID corresponding to a recording medium designated to write music content is stored from the storage means (storage device). The acquired music ID is encrypted using the acquired media ID, and the encrypted music content is written to the designated recording medium. Thereby, the music content encrypted in a complicated manner is recorded on the recording medium.

  According to a fifth aspect of the present invention, there is provided an electronic music apparatus according to the fourth aspect, wherein a common secret key and the media ID are acquired from a storage device for music content including common key information independent of the type of recording medium, and the common key information is obtained. And the media ID are generated, the music content is encrypted using the generated encryption key, the common key information is encrypted using the common secret key, and the encrypted common key is encrypted. The encrypted music content including information is written to the designated recording medium. Thereby, the music content encrypted in a complicated manner is recorded on the recording medium.

  According to a sixth aspect of the present invention, there is provided an electronic music apparatus according to the fourth aspect, wherein the music content includes music data representing music, a music data key for encrypting the music data, and common key information independent of the type of recording media. On the other hand, the common secret key and the media ID are obtained from the storage device, the music data is encrypted using the music data key, and the encryption key is generated using the common key information and the media ID. The music data key is encrypted using the encryption key. The common key information is encrypted using the common secret key, and the encrypted music content including the encrypted music data, the music data key, and the common key information is written to the designated recording medium. Thereby, the music content encrypted in a complicated manner is recorded on the recording medium.

  By executing the electronic music device according to claim 7 or the computer-readable program according to claim 13 on a computer, a media ID corresponding to a recording medium for which music content is designated to be read from storage means (storage device) is obtained. Obtaining and reading the encrypted music content from the recording medium, decrypting the read and encrypted music content using the obtained read medium ID, and the decrypted music content Is temporarily stored in the temporary storage means (temporary storage device), and the media ID corresponding to the recording medium designated for writing the music content is acquired from the storage means (memory device), and the acquired writing is obtained. The music content stored in the temporary storage means is encrypted using the media ID The encrypted music content and to write write to the recording medium writing is designated the music content. As a result, the music content is encrypted and recorded in accordance with the destination recording medium.

  An electronic music apparatus according to an eighth aspect is the electronic music device according to the seventh aspect, in which the common secret key and the medium are stored from the storage means for the encrypted music content including the encrypted common key information independent of the type of the storage medium. An ID is acquired, the common key information is decrypted using the common secret key, a decryption key is generated using the decrypted common key information and the read media ID, and the generated decryption key is The music content is decrypted using the decrypted music content, and the decrypted music content including the decrypted common key information is temporarily stored in the temporary storage means. An encryption key is generated using the common key information stored in the temporary storage means and the writing media ID, and the music content stored in the temporary storage means is generated using the generated encryption key. Encrypt. The common key information stored in the temporary storage means is encrypted using the common secret key, and writing of the music content is designated for the encrypted music content including the encrypted common key information. It was written on the recording media. As a result, the music content is encrypted and recorded in accordance with the destination recording medium.

  The electronic music apparatus according to claim 9 is the electronic music device according to claim 7, wherein the encrypted music data representing the music, the encrypted music data key for decrypting the encrypted music data, and the type of the recording medium For the encrypted music content including the encrypted common key information independent from the common secret key and the media ID from the storage means, decrypt the common key information using the common secret key, A decryption key is generated using the decrypted common key information and the read media ID, the music data key is decrypted using the generated decryption key, and the decrypted music data key is The music data is decrypted using the data, and the decrypted common key information, music data key and music data are temporarily stored in the temporary storage means. The music data stored in the temporary storage means is encrypted using the music data key stored in the temporary storage means, and the common key information and the writing medium ID stored in the temporary storage means are used. To generate an encryption key. Encrypting the music data key stored in the temporary storage means using the generated encryption key, and encrypting the common key information stored in the temporary storage means using a common secret key, The encrypted music content including the encrypted music data, the music data key, and the common key information is written to the designated recording medium. As a result, the music content is encrypted and recorded in accordance with the destination recording medium.

  The electronic music device according to claim 10 is the electronic music device according to any one of claims 7 to 9, wherein the encrypted music content is written on the recording medium designated to write the music content, and then the music content stored in the temporary storage means is stored. I deleted it. As a result, the music content is encrypted and recorded in accordance with the destination recording medium.

  According to the first or eleventh aspect, since the encrypted music content cannot be decrypted unless the media ID corresponding to the recording medium on which the music content is recorded can be obtained, the data is recorded on a plurality of recording media. The music content that has been played cannot be freely played, and the copyright protection of the music content is enhanced.

  According to the second or third aspect, the same effect as that of the first aspect can be obtained, and the decryption procedure is complicated, so that the copyright protection of the music content is further enhanced.

  According to claims 4 to 6 or claim 12, the music content that is encrypted in a complicated manner is recorded on the recording medium, and the copyright protection of the music content is further enhanced.

  According to the seventh to tenth aspects, even if the music content is moved from one of the plurality of recording media to the other recording medium, the music content is encrypted according to the destination recording medium. Since it is recorded in a digital form, the copyright protection of the music content is enhanced.

  FIG. 1 is a block diagram showing the hardware configuration of an electronic musical instrument and peripheral devices according to an embodiment of the present invention. The CPU 1 (control means) uses the working area of the RAM 3 based on a control program stored in the ROM 2 to make the entire electronic musical instrument. Control. As a basic function of a normal electronic musical instrument, the CPU 1 detects an operation event such as a keyboard of the input operation unit 4 and controls manual performance. Further, an operation event such as a panel operator of the input operation unit 4 is detected, and processing corresponding to the operation of various operators is performed. Further, display control on the display 5 such as a liquid crystal panel is performed. The sound source 6 generates a musical sound signal according to various data set by the CPU 1 by keyboard performance or automatic performance and outputs it to the sound system 7. The sound system 7 performs D / A conversion, amplification, etc. of the musical sound signal. And pronounce it with a speaker.

  The electronic musical instrument includes a memory card reading device 9 that reads and writes data from and to a memory card 8, a hard disk device (HDD) 10 that reads and writes data on a built-in hard disk, and an internal storage area as a recording medium or a drive device thereof. Are provided with a flash memory ROM 11 for reading / writing data from / to a CD-ROM drive 13 for reading data from a CD-ROM 12. Among these, the memory card reading device 9, the hard disk device 10, and the flash memory ROM 11 are built in the instrument body, but the CD-ROM drive 13 is externally attached via a interface 14 with a USB cable. It can also be connected to the Internet 15 via the interface 14. That is, in this embodiment, the memory card 8, the hard disk device 10, the flash memory ROM 11, the CD-ROM 12, and the Internet 15 site are a plurality of different types of recording media.

  And, for the Internet connection portion of the memory card reading device 9, the hard disk device 10, the flash memory ROM 11, the CD-ROM drive 13, and the interface 14, the media IDs (in the order of “MD1, MD2, MD3, MD4, MD5 in order) are respectively different IDs. Is assigned). These media IDs are encrypted and written in a predetermined area of the control program stored in the ROM 2 (storage means). Thereby, in the electronic musical instrument, a media ID is set for each recording medium. The media ID may be anything as long as it can be used as a secret key, but it is not easily guessed and is preferably different from each other.

  FIG. 2 is a diagram showing an outline of processing for music data handled by the electronic musical instrument of the embodiment and each recording medium. The “provision of music data” block includes a seller on the memory card 8 and CD-ROM 12 on which music data is recorded, a site on the Internet 15 that provides music data distribution and sales services, and the like. The music data provided by the memory card 8, the CD-ROM 12, and the Internet 15 is stored in a secret key to be described later based on the media ID corresponding to each recording medium for the electronic musical instrument (the same media ID as in the electronic musical instrument). Pre-encrypted. The encrypted music data is provided by a corresponding recording medium.

  The encrypted music data stored in the memory card 8 and the CD-ROM 12 is decrypted by reading (LOAD) using a secret key based on each media ID (MD1, MD2). The encrypted music data downloaded from the Internet 15 is decrypted with a secret key based on the media ID (MD5). Each decrypted music data is stored in the content storage area (temporary storage means or temporary storage device) of the RAM 3. In addition, recording media that can be recorded in the memory card 8, the hard disk device 10, and the flash memory ROM 11 can be encrypted (SAVE) on the recording medium after being encrypted with a secret key based on each media ID. Between recording media that can be read and recorded, music data that requires copyright protection, that is, encrypted music data, cannot be copied and can only be moved.

  FIG. 3 is a conceptual diagram showing the data structure of the encrypted music content and the decryption and encryption procedures. The music content data includes common key information, security information, and music data information, and these pieces of information are encrypted. The common key information includes a common key A set based on a random value. The security information includes a file name, a copyrighted work name, copyright information (flag), and a content ID. This content ID is one ID for the entire music content data. This content ID functions as a key C (music data key) to be described later for decrypting the music information. The music data information includes MIDI music data, logical score data, style (accompaniment performance data), registration (data designating timbres and effects of an electronic organ, etc.), and the like.

  The ROM 2 (storage means) stores a control program and media IDs (MD1, MD2, MD3, MD4, MD5) corresponding to the recording media. These media IDs are stored in places (addresses) separated from each other by performing separate encryption with a predetermined secret key that is different for each recording medium. Since the storage location and encryption processing of the media ID are predetermined for each recording medium, it is possible to read and decrypt the media ID corresponding to each recording medium by executing a control program in the electronic musical instrument. Needless to say. A predetermined secret key AA (common secret key) is stored in the control program of the ROM 2. The secret key AA is for decrypting the common key information in the music content and encrypting the decrypted common key information.

  When decrypting the encrypted music content, first, the common key information is decrypted with the secret key AA in the control program to obtain the common key A. Next, a media ID corresponding to the recording medium of the music content is decrypted and read out, and a key B (for decryption) for decrypting the security information by performing a predetermined calculation or the like using the media ID and the common key A Key). Further, the security information is decrypted with the key B, and the content ID therein is obtained as a key C (music data key). Then, the music data information is decrypted with this key C. The key A, key B, key C, media ID, and music data obtained by this decryption are temporarily stored in the content storage area (temporary storage means or temporary storage device) of the RAM 3 in a decrypted state. The music data and the like are read in accordance with a predetermined program and used as appropriate for automatic performance or the like.

  Next, the encryption procedure when recording the decrypted music content in the memory card 8, the hard disk device 10, the flash memory ROM 11, or the like is as follows. First, when security information of music content to be encrypted (recorded) is designated, a key B (encryption key) is determined by the common key A of the common key information of the music content corresponding to the security information and the media ID of the recording medium of the recording destination. ) Is generated. Then, the security information (including the content ID (music data key)) is encrypted with the key B, and the common key information including the common key A is encrypted with the predetermined secret key AA (common secret key) in the control program. To do. Then, the music data information is encrypted with the key C (music data key) which is the content ID before encryption.

  4 is a flowchart of a main routine of the embodiment, FIG. 5 is a flowchart of a reading routine, and FIG. 6 is a flowchart of a writing routine. Processing of each of these routines is performed based on execution of a control program by the CPU 1 (control means). In the main routine of FIG. 4, in step S1, activation processing such as initial setting, processing corresponding to operation of the operation panel of the input operation unit 4, sound generation processing based on performance on the keyboard of the input operation unit 4, and based on music data Automatic performance processing, performance guide processing such as key-on guide lamp lighting, specification processing of music content temporarily stored in the content storage area of the RAM 3, memory card 8, hard disk device 10, flash memory ROM 11, CD-ROM drive 13 ( A general processing of the electronic musical instrument such as a recording medium specifying process including the CD-ROM 12) and the Internet 15 and a content specifying process in the recording medium is performed.

  Next, it is determined whether or not there is a music data loading instruction in step S2. If there is no loading instruction, the process proceeds to step S4. If there is a loading instruction, the reading routine of FIG. 5 is performed in step S3, and the process proceeds to step S4. . In step S4, the presence / absence of a music data save instruction is determined. If there is no save instruction, the process proceeds to step S6. If there is a save instruction, the write routine of FIG. 6 is performed in step S5, and the process proceeds to step S6. In step S6, other processing is performed, and in step S7, if the processing is not completed due to power-off or the like, step S1 and subsequent steps are repeated.

  In the reading routine of FIG. 5, it is determined whether or not the music content is encrypted in step S11. If it is not encrypted, the music content is directly read in step S12 and temporarily recorded in the content storage area of the RAM 3. Proceed to step S26. If it is encrypted, the processing from step S13 is performed. Note that whether or not the music content is encrypted may be determined to be encrypted if it cannot be read, for example, by performing a normal reading operation. It may be recorded.

  In steps S13 to S17, it is determined which type of recording medium is read from, and in steps S18 to S22, processing corresponding to each recording medium is performed. That is, in steps S18 to S22, the data of the media ID corresponding to the recording medium is read from the position (address) corresponding to the recording medium to be read in the ROM 2 and decoded, and the decoded values (MD1 to MD5). Is stored as the corresponding media ID. Then, the process proceeds to step S24. If it is not any recording medium, a warning display such as “Incompatible recording medium” is displayed in step S23, and the process proceeds to step S26.

  In step S24, as described with reference to FIG. 3, the common key A is obtained by decrypting the common key information using the secret key AA, and the key B (decryption key) is obtained using the common key A and the media ID. The security information is decrypted with the key B, and the music data is decrypted with the content ID of the security information as the key C (music data key). Next, in step S25, each key, ID, security information, and music data are temporarily stored (virtual storage) in the content storage area of the RAM 3 in a decrypted state. If the data to be read in step S16 is not completed, the process returns to step S11. If completed, the process returns to the original routine.

  6 is read out from the recording medium and decrypted by the processing of the reading routine in FIG. 5, and is temporarily stored (virtual storage) in the content storage area (temporary storage means or temporary storage device) of the RAM 3. And is activated when the music content is selected in step S1 of FIG. 4 (when music data and corresponding security information are designated). That is, this writing routine is a process of encrypting and writing the music content decrypted in the RAM 3 and temporarily stored in the recording medium in response to the determination of the music data saving instruction in step S4 of FIG. is there. First, in step S31, it is determined whether or not the music content is to be encrypted. If it is not to be encrypted, the music content is written in the recording medium without being encrypted in step S32, and the process proceeds to step S44. . If it is to be encrypted, the processing from step S33 is performed. Whether or not the music content should be encrypted is determined by copyright information (flag) of security information or the like.

  In steps S33 to S36, it is determined which type of recording medium is to be written, and in steps S37 to S40, processing corresponding to each recording medium is performed. Steps S51 and S52 indicated by broken lines will be described later. In steps S37 to S40, the data of the media ID corresponding to the recording medium is read from the position (address) corresponding to the recording medium to be written in the ROM 2 and decrypted, and the decrypted values (MD1 to MD3 and MD5) are obtained. Store as the corresponding media ID. Then, the process proceeds to step S42. If it is not any recording medium, a warning display such as “There is no recording medium to be written” is displayed in step S41, and the process proceeds to step S44.

  In step S42, as described with reference to FIG. 3, a key B (encryption key) is created with the common key A and the media ID, and security information (music data key) is encrypted with the key B. Further, the common key A is encrypted with the secret key AA. Further, the music data is encrypted using the content ID in the security information as a key C (music data key), and the common key A information, security information, and music data are combined into one music content. Next, in step S43, the music content in which the common key A information, the security information, and the music data are collected is recorded on the designated recording medium, and the music content temporarily stored (virtual storage) in the RAM 3 is deleted. If the data to be written is not completed in step S44, the process returns to step S31. If completed, the process returns to the original routine.

  In the above embodiment, the case where the CD-ROM drive 13 only reads from the CD-ROM 12 has been described. However, when the CD-ROM drive 13 has a function of writing to the CDR / RW, FIG. What is necessary is just to perform step S51, S52 shown with the broken line. That is, when it is determined in step S51 whether to write to the CDR / RW, in step S52, the data of the media ID corresponding to the CDR / RW is read from the position (address) corresponding to the CDR / RW in the ROM 2 and decoded. And store it as a media ID and proceed to step S42.

  In the above-described embodiment, it is basically not considered to modify the apparatus, but a common media ID (media number) is set for each type of recording medium, and music data is encrypted. Therefore, if the recording medium (other than the flash memory) of the first electronic musical instrument is removed and attached to a second electronic musical instrument different from the first electronic musical instrument, the music data used for the first electronic musical instrument becomes the second It will be available for use with electronic musical instruments. The flash memory (ROM) is fixed on the substrate by soldering and cannot be removed. This can be solved by using the following method except for the CD-ROM. For memory cards that can be easily removed, those with ID numbers are used, and each memory card is encrypted differently and recorded on the memory card. The hard disk device is encrypted and recorded on the basis of each format / serial number having a different numerical value for each hard disk device. This means that the ID storage means for storing the media ID provided for each type of recording medium is provided not only for the ROM 2 but for each recording medium. According to this, decoding can be performed only by one electronic musical instrument.

  In the above embodiment, the music data recorded on one of the plurality of recording media is temporarily stored in the RAM 3, and the music data temporarily stored in the RAM 3 is plural. Recording on one of the recording media was independently performed. However, in addition to this, the music content recorded on one of the plurality of recording media can be transferred to another one of the plurality of recording media. In this case, the CPU 1 executes the main routine of FIG. 7 in which the processes of steps S8, S3 ', and S5' are added between steps S5 and S6 of FIG.

  In this main routine, when the music content is instructed to move by the process corresponding to the operation of the operation panel in the input operation unit 4 in step S1, the CPU 1 determines “YES” in step S8, and steps S3 ′, S5 'is automatically executed sequentially. Steps S3 'and S5' are the same as steps S3 and S5 in the above embodiment. In this case, one recording medium that records the music content to be moved and the music content in the recording medium are designated, and the destination recording medium on which the music content is recorded is designated. Thereby, the music content recorded on one designated recording medium is decrypted and temporarily stored in the RAM 3 in the same manner as in the above embodiment. Thereafter, the temporarily stored music content is automatically read out from the RAM 3, and is encrypted and recorded on one designated recording medium as in the above embodiment. Further, the music content in the RAM 3 is subsequently erased.

  In the embodiment and the modification described above, the security information is decrypted and encrypted with the key B, and the music data information is decrypted and encrypted with the key C (music data key) in the security information. However, instead of this, the key C (music data key) that is the content ID in the security information is omitted, and the music data information and security information (content ID are used) by the key B (decryption key and encryption key). The key C may not be decrypted and encrypted.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

It is a hardware configuration block diagram of an electronic musical instrument and a peripheral device of an embodiment of the present invention. It is a figure which shows the outline of a process with respect to the music data and each recording medium which the electronic musical instrument of embodiment deals with. It is a conceptual diagram which shows the data structure of the music content in the embodiment, and the procedure of a decoding and encryption. It is a flowchart of the main routine in an embodiment. It is a flowchart of the reading routine in an embodiment. It is a flowchart of the writing routine in an embodiment. It is a flowchart which shows the modification of the said main routine.

Explanation of symbols

  2 ... ROM, 3 ... RAM, 8 ... memory card, 9 ... memory card reading device, 10 ... hard disk device, 11 ... flash memory ROM, 12 ... CD-ROM, 13 ... CD-ROM drive, 15 ... Internet

Claims (13)

An electronic music device capable of reproducing encrypted music content recorded on a plurality of types of recording media,
Storage means for storing a plurality of media IDs respectively assigned to a plurality of types of recording media;
Media ID acquisition means for acquiring a media ID corresponding to a recording medium for which reading of music content is designated from among a plurality of media IDs stored in the storage means;
Reading means for reading the encrypted music content from the recording medium designated for reading the music content, and decrypting the read and encrypted music content using the acquired media ID; An electronic music apparatus comprising: The electronic music apparatus according to claim 1,
The encrypted music content includes encrypted common key information independent of the type of recording medium,
The storage means further stores a common secret key for decrypting the encrypted common key information,
The reading means includes
Common key information decryption means for decrypting the encrypted common key information using the common secret key;
Decryption key generation means for generating a decryption key for decrypting the encrypted music content using the decrypted common key information and the acquired media ID;
An electronic music apparatus comprising: music content decrypting means for decrypting the read and encrypted music content using the generated decryption key. The electronic music apparatus according to claim 1,
The encrypted music content includes encrypted music data representing music, an encrypted music data key for decrypting the encrypted music data, and an encryption independent of the type of recording medium Symmetric key information,
The storage means further stores a common secret key for decrypting the encrypted common key information,
The reading means includes
Common key information decryption means for decrypting the encrypted common key information using the common secret key;
Decryption key generation means for generating a decryption key for decrypting the encrypted music data key using the decrypted common key information and the acquired media ID;
Music data key decrypting means for decrypting an encrypted music data key included in the read and encrypted music content using the generated decryption key;
And a music data decrypting means for decrypting the encrypted music data included in the read and encrypted music content by using the decrypted music data key. Music device. An electronic music device capable of encrypting and recording music content on a plurality of types of recording media,
Storage means for storing a plurality of media IDs respectively assigned to a plurality of types of recording media;
Media ID acquisition means for acquiring a media ID corresponding to a recording medium for which writing of music content is designated from among a plurality of media IDs stored in the storage means;
An electronic music apparatus comprising: writing means for encrypting music content using the acquired media ID, and writing the encrypted music content to the designated recording medium. The electronic music apparatus according to claim 4,
The music content includes common key information independent of the type of recording medium,
The storage means further stores a common secret key for encrypting the common key information;
The writing means includes
An encryption key generating means for generating an encryption key using the common key information and the media ID;
Music content encryption means for encrypting the music content using the generated encryption key;
Common key information encryption means for encrypting the common key information using the common secret key;
An electronic music apparatus comprising: music content writing means for writing the encrypted music content including the encrypted common key information to the designated recording medium. The electronic music apparatus according to claim 4,
The music content includes music data representing music, a music data key for encrypting the music data, and common key information independent of the type of recording media,
The storage means further stores a common secret key for encrypting the common key information;
The writing means includes
Music data encryption means for encrypting music data using the music data key;
An encryption key generating means for generating an encryption key using the common key information and the media ID;
Music data key encryption means for encrypting the music data key using the generated encryption key;
Common key information encryption means for encrypting the common key information using the common secret key;
Music content writing means for writing encrypted music content including the encrypted music data, the encrypted music data key and the encrypted common key information to the designated recording medium. An electronic music device characterized by the above. An electronic music device capable of moving encrypted music content between a plurality of types of recording media,
Storage means for storing a plurality of media IDs respectively assigned to a plurality of types of recording media;
Reading media ID acquisition means for acquiring, as a reading media ID, a media ID corresponding to a recording medium for which reading of music content is designated from among a plurality of media IDs stored in the storage means;
Reading means for reading encrypted music content from a recording medium designated to read the music content, and decrypting the read and encrypted music content using the read reading medium ID When,
Music content temporary storage means for temporarily storing the decrypted music content;
A writing medium ID acquisition unit that acquires, as a writing medium ID, a media ID corresponding to a recording medium for which writing of music content is designated, from among a plurality of media IDs stored in the storage unit;
Writing means for encrypting the temporarily stored music content using the acquired writing medium ID and writing the encrypted music content to a recording medium designated to write the music content. An electronic music apparatus characterized by that. The electronic music apparatus according to claim 7,
The encrypted music content includes encrypted common key information independent of the type of storage medium,
The storage means further stores a common secret key for decrypting and encrypting the common key information,
The reading means includes
Common key information decryption means for decrypting the encrypted common key information using the common secret key;
Decryption key generation means for generating a decryption key for decrypting the music content using the decrypted common key information and the acquired read-out media ID;
Music content decrypting means for decrypting the read and encrypted music content using the generated decryption key;
The temporary storage means temporarily stores the decrypted music content including the decrypted common key information,
The writing means includes
An encryption key generating means for generating an encryption key using the common key information stored in the temporary storage means and the writing medium ID;
Music content encryption means for encrypting music content stored in the temporary storage means using the generated encryption key;
Common key information encryption means for encrypting common key information stored in the temporary storage means using the common secret key;
An electronic music apparatus, comprising: music content writing means for writing the encrypted music content including the encrypted common key information to a recording medium designated to write the music content. The electronic music apparatus according to claim 7,
The encrypted music content includes encrypted song data representing a song, an encrypted song data key for decrypting the encrypted song data, and an encryption independent of the type of recording medium. Symmetric key information,
The storage means further stores a common secret key for decrypting and encrypting the common key information,
The reading means includes
Common key information decryption means for decrypting the encrypted common key information using the common secret key;
Decryption key generation means for generating a decryption key using the decrypted common key information and the acquired read-out media ID;
Song data key decrypting means for decrypting the encrypted song data key using the generated decryption key;
Music data decrypting means for decrypting the encrypted music data using the decrypted music data key;
The temporary storage means temporarily stores the decrypted common key information, music data key and music data,
The writing means includes
Music data encryption means for encrypting music data stored in the temporary storage means using a music data key stored in the temporary storage means;
An encryption key generating means for generating an encryption key using the common key information stored in the temporary storage means and the writing media ID;
Music data key encryption means for encrypting a music data key stored in the temporary storage means, using the generated encryption key;
Common key information encryption means for encrypting common key information stored in the temporary storage means using the common secret key;
An electronic music apparatus, comprising: music content writing means for writing encrypted music content including the encrypted music data, music data key and common key information to the designated recording medium. The electronic music device according to any one of claims 7 to 9, further comprising:
The writer includes an erasing unit for erasing the music content stored in the temporary storage unit after the encrypted music content is written to a recording medium designated to write the music content. Electronic music device. A computer-readable program applied to an electronic music device capable of reproducing encrypted music content recorded on a plurality of types of recording media,
A media ID acquisition step of acquiring a media ID corresponding to a recording medium designated to read out music content from a plurality of media IDs stored in the storage device and respectively assigned to a plurality of types of recording media;
A read step of reading the encrypted music content from the recording medium designated to read the music content, and decrypting the read and encrypted music content using the acquired media ID; A computer-readable program comprising: A computer-readable program applied to an electronic music apparatus capable of encrypting and recording music content on a plurality of types of recording media,
A media ID acquisition step of acquiring a media ID corresponding to a recording medium designated to write music content from a plurality of media IDs stored in the storage device and assigned to a plurality of types of recording media;
A computer-readable program comprising: a writing step of encrypting music content using the acquired media ID and writing the encrypted music content to the designated recording medium. A computer-readable program applied to an electronic music device capable of moving encrypted music content between a plurality of types of recording media,
Reading for acquiring a media ID corresponding to a recording medium for which reading of music content is designated from among a plurality of media IDs stored in the storage device and respectively assigned to a plurality of types of recording media. A media ID acquisition step;
Reading means for reading encrypted music content from a recording medium designated to read the music content, and decrypting the read and encrypted music content using the read reading medium ID When,
A temporary storage step of temporarily storing the decrypted music content in a temporary storage device;
A writing medium ID acquisition step of acquiring, as a writing medium ID, a media ID corresponding to a recording medium for which writing of music content is designated from among a plurality of media IDs stored in the storage device;
A writing step of encrypting the music content stored in the temporary storage device using the acquired writing medium ID and writing the encrypted music content to the recording medium designated to write the music content A computer-readable program comprising:

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