JP2005071400A - Electronic music device and music data processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect copyright by utilizing a large-capacity unprotected recording medium in which the high-speed read/write of a file is possible. <P>SOLUTION: In this electronic music system, a music data file Mf is stored in a protected recording medium 4b1 not readable by a general-purpose device PC but readable by a specific electronic music device including an electronic music device EM, and encrypted (EC) in a state of being decipherable by the specific electronic music device EM. The encrypted music data file ca be copied on an unprotected recording medium 4b2 readable by the general-purpose device PC and the specific electronic music device EM. In the protected recording medium, a copy management file Cf containing the copy information Cp of the music data file Mf is stored, and copying to the unprotected recording medium is limited (RF) on the basis of a copy situation indicated by the copy information Cp. When the music data file Mf is copied on the unprotected recording medium, the copy information Cp is updated (UD), and a copy limiting function on the unprotected recording medium is secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic music system for protecting copyright by copy protection of a music data file stored in an external storage medium.
[0002]
[Prior art]
Conventionally, various proposals have been made for copy protection of data recorded on an external storage medium such as a flexible disk. For an electronic music apparatus such as an electronic musical instrument, for example, as shown in Patent Document 1, Some data is forcibly erased when the storage medium is disconnected from the external storage medium.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 6-195066
Also, from a different perspective, music data files such as song data collections cannot be read by a general-purpose device such as a personal computer, but can be read by a specific electronic music device, and a specified external such as a flexible disk. Some are stored in a storage medium so that the music data file of the recording medium can be used only within a specific electronic music apparatus. Such a recording medium cannot be read by a general-purpose device (for example, a determination such as “data is corrupted”, “media is not formatted”, etc. is made), and is included in the recording medium. The music data file cannot be copied, and the copyright can be protected (hereinafter, this type of recording medium is referred to as a “protected recording medium”).
[0005]
However, such a dedicated protected recording medium that can be read only by a specific electronic music apparatus is, for example, a flexible disk, which has a limited data storage capacity, a slow file read / write speed, etc. There is a limit. Therefore, it is conceivable to copy and use music data files on a general-purpose recording medium (hereinafter referred to as “unprotected recording medium”) such as SmartMedia (registered trademark), which has a large capacity and allows quick file reading and writing. However, copying to an unprotected recording medium is not allowed from the viewpoint of copyright protection.
[0006]
[Problems to be solved by the invention]
In view of such circumstances, it is an object of the present invention to provide an electronic music system capable of protecting copyright while enabling use with an unprotected recording medium having a large capacity and quick file reading and writing.
[0007]
[Means for Solving the Problems]
According to the main feature of the present invention, the music data file (Mf) recorded on the protective recording medium (4b1) is read by a specific electronic device so that it can be read only by a specific electronic music device including the electronic music device (EM). Means (EC, S8) for encrypting so as to be decipherable by the music apparatus, means (S9) for copying the encrypted music data file to the unprotected recording medium (4b2), and music in the protected recording medium (4b1) Means (RF, S6) for restricting copying to the unprotected recording medium (4b2) based on copy information (Cp) recorded together with the data file (Mf) and indicating the copy status of the music data file (Mf) And a sound recorded on the protective recording medium (4b1) so that it can be read only by a specific electronic music device (EM). A step (S8) of encrypting the data file (Mf) so as to be decipherable by a specific electronic music device, and the music data file (Mf) recorded in the protected recording medium (4b1) together with the music data file (Mf) Based on the copy information (Mp) indicating the copy status, the step (S6) of permitting copying to the non-protected recording medium (4b2) and the copying permission (S6 → YES) to the non-protected recording medium (4b2) Thus, a music data processing program (Claim 3) is provided which causes a specific electronic music device to execute a procedure comprising the step (S9) of copying the encrypted music data file to the unprotected recording medium (4b2). . Note that the parentheses indicate corresponding reference symbols or terms in the embodiments, and the same applies to the following.
[0008]
The electronic music apparatus according to the present invention may further comprise means (UD, S7) for updating the content of the copy information in response to copying to the unprotected recording medium (4b2). it can.
[0009]
[Effects of the Invention]
In the electronic music system according to the present invention, the music data file (Mf) stored in the protection recording medium (4b1) that cannot be read by the general-purpose device but can be read by a specific electronic music device including the electronic music device (EM) is stored in the general-purpose device and When copying to a non-protected recording medium (4b2) that can be read by a specific electronic music device, encryption that enables decryption by the specific electronic music device is performed, and the encrypted music data file is an unprotected recording medium. It is copied to (4b2). Here, the protected recording medium (4b1) includes information (Cp) indicating the copy status of the music data file (Mf). Based on the content of the copy information (Cp), the unprotected recording medium is stored. Copying to (4b2) is restricted.
[0010]
That is, a music data file (Mf) in a specific file format is stored in a protective recording medium (4b1) such as a flexible disk so that it cannot be read by a general-purpose device such as a personal computer but only by a specific electronic music device (Em). When the electronic music system is configured by the electronic music device and the dedicated recording medium (4b1) so that the music data file (Mf) can be used only by a specific electronic music device. Copy information (Cp) representing the copy status of the music data file (Mf) is recorded on the protected recording medium (4b1), and if the copy status should be permitted (RF) with reference to the copy information (Cp) ( S6 → YES), a music data file (Mf) on the protected recording medium (4b1) can be read by a general-purpose device and a specific electronic music device. Copying unprotected recording media such as preparative media (4b2) (S9) to allow. Further, when copying to the unprotected recording medium (4b2), the music data file (Mf) is encrypted in a state where it can be decrypted in a specific electronic music device (EC, S8).
[0011]
In recent years, a large number of non-protected recording media that can be read and written not only by electronic music devices but also by general-purpose devices have been distributed. For example, such as a small memory card such as a smart media, there are advantages such as large capacity and quick file reading and writing. There are many things. In the present invention, since the music data file to be copied to such an unprotected recording medium (4b2) is encrypted, even if it is copied, it cannot be used by other devices. Further, since copy restriction is made based on the content of the copy information (Cp), it is possible to prevent the music data file (Mf) from being copied to another unprotected recording medium (4b2) without restriction. Furthermore, since the copy information (Cp) is stored in the protected recording medium (4b1), the data cannot be altered using a general-purpose device. Therefore, copyright protection can be achieved while making use of an unprotected recording medium.
[0012]
In the present invention, when the music data file (Mf) is copied to the non-protected recording medium (4b2), the copy information (Cp) is updated (UD, S7). Copy restriction to (4b2) can be performed reliably.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described below with reference to the drawings. However, this is merely an example, and the present invention can be variously modified without departing from the spirit of the invention.
[0014]
[System Overview]
In one embodiment of the present invention, an electronic musical instrument is used as an electronic music apparatus that performs music data processing using a music data file recorded on an external storage medium. FIG. 1 is a block diagram showing the hardware configuration of an electronic music system according to an embodiment of the present invention. The electronic musical instrument EM includes a central processing unit (CPU) 1, a random access memory (RAM) 2, a read-only memory (ROM) 3, an external storage device 4, a performance operation detection circuit 5, a setting operation detection circuit 6, and a display circuit 7. , A sound source circuit 8, an effect circuit 9, a MIDI interface (I / F) 10, a communication interface (I / F) 11, and the like, and these devices 1 to 11 are connected to each other via a bus 12.
[0015]
The CPU 1 executes various music data processes including a music data copy process called “protected recording medium process” using a clock generated by the timer 13 in accordance with a predetermined control program. The RAM 2 is used as a work area for temporarily storing various data necessary for these processes. The ROM 3 stores in advance various control programs, various data, parameters, and the like for executing these processes.
[0016]
The external storage device 4 includes a compact disk read only memory (CD-ROM), a flexible disk (FD), and a magneto-optical (MO) disk in addition to a built-in storage medium 4a such as a hard disk (HD) and its driving device. Various portable external storage media 4b and their driving devices, such as digital multi-purpose discs (DVD), small memory cards such as smart media, etc. The external storage medium 4b includes a protected recording medium 4b1 and an unprotected recording medium 4b2, as will be described later.
[0017]
The performance operation detection circuit 5 detects the performance operation contents of the performance operation elements 14 such as a keyboard and a wheel, and the setting operation detection circuit 6 detects the setting operation contents of the setting operation elements 15 such as numeric / cursor keys and panel switches. Then, information corresponding to the detected contents is introduced into the system main body. The display circuit 7 includes a display for displaying various screens and various indicators (lamps), and controls the display / lighting contents in accordance with instructions from the CPU 1 to provide display assistance for the operations of the operators 14 and 15.
[0018]
The tone generator circuit 8 generates a musical tone signal corresponding to musical performance data from the performance operator 14 or automatically processed music data (song data) processed by a sequencer. A predetermined effect including a timbre is imparted to each channel by the effect circuit 9 having the imparting DSP. The sound system 17 connected to the effect circuit 9 includes a D / A converter, an amplifier, and a speaker, and generates a musical sound based on the musical sound signal to which the effect is given.
[0019]
Further, another electronic musical instrument (MIDI device) MD is connected to the MIDII / F10, and music information such as music data is exchanged between the electronic musical instrument (electronic music apparatus) and the other electronic musical instrument MD. It can be used in the electronic music apparatus EM. In addition, the communication I / F 11 is connected to a communication network CN such as the Internet or a local area network (LAN), and downloads various information such as control programs and song data from an external server computer SV and the like to an external storage device. 4 can be used in this electronic music apparatus EM.
[0020]
[Can copy music data files?]
In an electronic music system according to an embodiment of the present invention, a music data file cannot be read by a general-purpose information processing apparatus (general-purpose) such as a personal computer (PC), and a predetermined file format is readable by a specific electronic music apparatus. A music data file recorded on a recording medium (referred to as a “protective recording medium”) and recorded on the protective recording medium can be used only by a specific electronic music apparatus. FIG. 2 is a view for explaining whether or not the music data file can be copied in the electronic music system according to the embodiment of the present invention.
[0021]
Here, the outline of the function of the electronic music system will be described very simply with reference to FIG. In this electronic music system, the music data file Mf stored in the protection recording medium 4b1 that cannot be read by the general-purpose device PC but can be read by the specific electronic music device including the electronic music device EM can be decoded by the specific electronic music device EM. Encrypted in state (EC). The encrypted music data file can be copied to the non-protected recording medium 4b2 that can be read by the general-purpose device PC and the specific electronic music device EM. The protected recording medium 4b1 stores a copy management file Cf including copy information (also referred to as “copy status information”) Cp related to the music data file Mf. The copy status indicated by the copy information Cp is stored in the copy status. Based on this, copying to the unprotected recording medium 4b2 is restricted (RF). Further, when the music data file Mf is copied to the non-protected recording medium 4b2, the copy information Cp is updated (UD) to ensure the function of restricting copying to the non-protected recording medium 4b2.
[0022]
Hereinafter, FIG. 2 will be described in detail. The protective recording medium 4b1 is one of the external storage media 4b in the external storage device 4, and is already distributed as a music data collection at the time of the present invention. For example, a flexible disk is used. . As described above, the protection recording medium 4b1 cannot read the music data file Mf and the copy management file Cf by a general-purpose device, but the electronic music device EM or a specific electronic music device having a data file decoding function similar thereto. (Referred to as “specific electronic music device”) stores it in a readable file format.
[0023]
Therefore, when the protected recording medium 4b1 is applied to an external storage medium driving device of a general-purpose device such as a PC, as shown by a broken line in FIG. 2A, the general-purpose device copies the music data file Mf or copy in the protected recording medium 4b1. The management file Cf is not visible. Therefore, the general-purpose device cannot copy the music data file Mf and cannot alter the copy management file Cf. Note that the copy management file Cf is created on a protected recording medium in the electronic music apparatus EM, and is not included at the time of distribution.
[0024]
On the other hand, in the case of a specific electronic music apparatus such as this electronic music apparatus EM, as shown in FIG. 2B, the music data file Mf and the copy management file in the protected recording medium 4b1 can be seen, and the data encryption means EC Can be stored in a non-protected recording medium 4b2, which is one of the external storage media 4b, for example, a small memory card such as a smart media. In this case, in the electronic music apparatus EM having a function as the specific electronic music apparatus, the music data file Mf can be copied by referring to the copy management file Cf by the management file reference means RF. Further, every time copying is performed, the copy management file Cf in the protected recording medium 4b1 is updated by the management file updating means UD. Note that the copy management file cannot be tampered with from the specific electronic music apparatus EM.
[0025]
The copy management file Cf corresponds to each of a plurality of song data files Mf1 to Mfn included in the protected recording medium 4b1 as a song data file Mf, for example, as shown in the lower left of FIG. The copy information CP representing the copy status of each music data file is recorded. In the illustrated example, “not copied” in the copy information CP is that the corresponding music data file (Mf1, Mf2, etc.) has not been copied yet and can be copied to the unprotected recording medium 4b2 such as smart media. Represents the situation. When the music data file is copied once, the copy information CP is “copied” and cannot be copied after the second time. The copy information CP is described by a copy flag of “0” (not copied) / “1” (already copied), for example. Note that the number of times that copying is possible is not limited to once as described above, but may be a finite number of two or more times.
[0026]
[Example of processing flow]
FIG. 3 is a flowchart showing an example of protected recording medium processing (music data copy processing) based on a music data processing program according to one embodiment of the present invention. This processing flow starts when the protected recording medium 4b1 is accessed by the operation of a predetermined setting operator 15 during the operation of the main processing of the electronic music apparatus EM. That is, it is detected whether or not the protected recording medium 4b1 has been accessed (step S1). If there is no such access (S1 → NO), the process immediately passes through the protected recording medium process and returns to the main process. If there is (S1 → YES), the process flow from step S2 onward is entered. In the following, a corresponding step is represented by a step reference symbol such as “S...” Alone.
[0027]
When the protected recording medium 4b1 is accessed (S1 → YES), it is next determined whether or not the accessed protected recording medium 4b1 has a copy management file Cf (S2). If there is no copy management file Cf (S2 → NO), a copy management file Cf to be included in the recording medium 4b1 is newly created, and all the music data files Mf (Mf1 to Mfn in the example of FIG. 2) are created. The content of the copy information Cp of “)” is set to “not copied” (copy flag = “0”) (S3).
[0028]
After newly creating the copy management file Cf (S3) or when it is determined that there is a copy management file Cf (S2 → YES), a list of song data files Mf stored in the accessed protected recording medium 4b1 is displayed on the display 16 Displayed above and asks the user to select or copy a desired song data file (S4). Then, based on the user operation, a song data file is selected from the displayed song data list, and it is determined whether there is an instruction to copy the selected song data file to the non-protected recording medium 4b2 (S5). .
[0029]
If it is determined that the song data file selected by the user operation is copied to the unprotected recording medium 4b2 (S5 → YES), the management file reference means RF copies the song data file in the copy management file Cf. It is determined whether or not the content of Cp is “not copied” (“0”) (S6). Then, if it is found that the copy information Cp = “copy not yet” (S6 → YES), the process proceeds to a copy execution process (S7 to S9) to an unprotected recording medium.
[0030]
In the copy execution process to the non-protected recording medium, first, the management file update unit UD sets the content of the copy information Cp of the music data file for the copy management file Cf of the protected recording medium 4b1 to “copied” (copy flag = “ 1 ″) (S7), and the data encryption means EC encrypts the music data file with the ID of the unprotected recording medium 4b2 or the ID of the electronic music device (S8). Then, a process of copying the encrypted music data file to the unprotected recording medium 4b2 is performed (S9), and then the process returns to the main process.
[0031]
On the other hand, when there is no selection operation of the music data file by the user, or the processing instructed by the further user operation on the music data file selected by the user operation is not copying to the unprotected recording medium 4b2. If so (S5 → NO), the process returns to the main process to perform another process or perform another process corresponding to the instruction for the song data file. Even when the copy information Cp = “copied” (S6 → NO), the process returns to the main process, and another process can be performed on the music data file.
[0032]
In another process using the selected song data file after returning to the main process, for example, a musical sound based on the song data is reproduced through the tone generators 8, 9, 17 or the contents of the song data are stored. (Score etc.) can be displayed on the display 16 or edited (edited).
[0033]
[Various Embodiments]
As mentioned above, although one Example of this invention was described, a various change is possible and it can implement in a various aspect. For example, the protection recording medium (4b1) is not limited to the flexible disk described in the embodiment, and may be any type of medium. Further, the non-protected recording medium (4b2) is not limited to a small memory card such as smart media, and may be any type of medium.
[0034]
As a mechanism for making the music data file and copy management file in the protected recording medium invisible from the general-purpose device, an original file system that cannot be interpreted by the general-purpose device may be adopted. In addition, a song data file that has already been copied to an unprotected recording medium cannot be accessed by being hidden when displaying the song data list from the protected recording medium, or access is prohibited although it is visible on the song data list. Or the like.
[0035]
When using (playing, displaying, editing, etc.) a song data file copied to an unprotected recording medium by the copy execution step (S9) in the processing flow of the embodiment, the ID (key) used for encryption is used. It can be used after decryption.
[0036]
In addition, in the encryption step (S8) of the processing flow of the embodiment, when encrypted with an ID of a certain unprotected recording medium (referred to as “first unprotected recording medium”), the first unprotected recording is performed. The medium is further referred to as another non-protected recording medium (“second unprotected recording medium”).
Even if the music data file is copied to (2), since the first unprotected recording medium ID is not known in the second unprotected recording medium, it cannot be decrypted and the copyright of the music data file can be protected. However, even in this case, if the first unprotected recording medium is brought to another electronic music apparatus, the music data file can be used.
[0037]
Furthermore, when encrypted with an ID of a certain electronic music apparatus, the music data file can be copied from the first non-protected recording medium to the second non-protected recording medium and copied to the second non-protected recording medium. The music data file can be used in the electronic music apparatus, but it cannot be used even if the second non-protected recording medium is provided in another electronic music apparatus. Therefore, copying to the second unprotected recording medium is limited to the range of private duplication, and the copyright of the music data can be protected.
[0038]
The form of the electronic music apparatus is not limited to a form specialized in music data processing such as an electronic musical instrument as in the embodiment, and application software having a function of decoding data in the protected recording medium (4b1) is used as a personal computer (PC). ) Or other general-purpose devices.
[0039]
【The invention's effect】
As described above, according to the present invention, the music data file (Mf) stored in the protected recording medium (4b1) that cannot be read by the general-purpose device but can be read by the specific electronic music device including the electronic music device is stored in the general-purpose device. In addition, the data is encrypted and copied to a non-protected recording medium (4b2) that can be read by the specific electronic music device in a state that can be decrypted by the specific electronic music device. As a result, the music data file in the non-protected recording medium is encrypted, so even if it is copied, it cannot be used by other devices.
[0040]
Further, the copy status information (Cp) of the music data file is included in the protected recording medium, and copying of the music data file is restricted based on this copy status information. Unlimited copying of music data files can be prevented. Furthermore, since the copy status information is stored in the protected recording medium, the data cannot be altered using a general-purpose device.
[0041]
Further, when the music data file is copied, the copy status information is updated, so that the copy restriction to the unprotected recording medium can be surely performed. As described above, according to the present invention, copyright protection can be achieved while making it possible to use an unprotected recording medium such as smart media.
[Brief description of the drawings]
FIG. 1 is a hardware configuration block diagram of an electronic music system according to an embodiment of the present invention.
FIG. 2 is a view for explaining whether or not a music data file can be copied in an electronic music system according to an embodiment of the present invention;
FIG. 3 is a flowchart showing an example of a protected recording medium process based on a music data processing program according to an embodiment of the present invention.
[Explanation of symbols]
4 an external storage device including an internal storage medium 4a and an external storage medium 4b,
4b1, 4b2 Protected recording medium and non-protected recording medium included in external storage medium 4b,
Mf; Mf1 to Mfn song data file,
Cp Copy [status] information of copy management file Cf,
EC data encryption means,
RF management file reference means,
UD management file update means.

Claims (3)

Means for encrypting a music data file recorded on a protected recording medium so as to be readable by a specific electronic music device so as to be readable only by a specific electronic music device including the electronic music device;
Means for copying the encrypted music data file to an unprotected recording medium;
An electronic music apparatus comprising: means for restricting copying to an unprotected recording medium based on copy information recorded together with a music data file in a protected recording medium and indicating a copy status of the music data file . further,
2. The electronic music apparatus according to claim 1, further comprising means for updating the content of the copy information in response to copying to an unprotected recording medium. Encrypting a music data file recorded on the protected recording medium so that it can be read only by a specific electronic music device so as to be readable by the specific electronic music device;
Permitting copying to a non-protected recording medium based on copy information recorded together with the music data file in the protected recording medium and indicating the copy status of the music data file;
A music data processing program for causing a specific electronic music apparatus to execute a procedure including a step of copying an encrypted music data file to an unprotected recording medium in response to permission to copy to the unprotected recording medium.

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