JP2001184057A - Electronic watermark burying method, music data reproducing method, music data distributing method and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent received music on a different terminal from reproducing by fixing the terminal which is capable of using a received music file and to prevent an unauthorized copying of the file. SOLUTION: A telephone number which is intrinsic data of a terminal such as a portable telephone 1 is embedded into a received music file as electronic watermark data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital watermark embedding method and a music data reproducing method for preventing unauthorized use of music data to be played at the time of an incoming call in a portable telephone.

[0002]

2. Description of the Related Art In recent years, a portable terminal such as a portable telephone or a PHS uses a so-called ringing melody for playing music as a ringing sound upon receiving a call. The incoming melody can reproduce one sound or a plurality of sounds, and various sounds can be played by combining these sounds.

[0003] By the way, it is necessary to input music data in advance for such a ring melody by some method.
The following method can be considered for this. (1) When a portable terminal main body is manufactured, an incoming melody file is stored in the main body in advance, and a user selects a desired incoming melody from the stored incoming melody files. (2) The user himself inputs the data of the incoming melody to the portable terminal while looking at the book or text file in which the incoming melody is described. (3) The dedicated adapter storing the ring tone melody file is connected to the mobile terminal, and the data of the ring tone melody is transferred from the adapter to the mobile terminal body. (4) The portable terminal is connected to a device such as a personal computer in which the incoming melody file is stored, and the incoming melody file is transferred. (5) The portable terminal connects to a server that distributes a ringtone melody file using a telephone line or the like, and downloads the ringtone melody file from the server.

The music data input as described above is obtained by cutting out a part of the music due to the nature of being used as a ring melody of a mobile phone, and is only a melody. Because of the differences, copying of music data by the user is not a problem. Even if the music data is copied, there is no problem because the user's own recognition of the copyright is low.

[0005]

However, when the quality of the ringtone melody is improved and the melody approaches the actual music, or when the length of the ringtone melody approaches the actual music, a serious problem gradually arises. Here, the usage form of receiving all performance information other than the melody part with a portable terminal such as a mobile phone and playing a music is collectively called ringing music, but the number of simultaneous sounds and the number of reproducible timbres of the ringing melody are called. It is expected that the number of ringtones will change from ringtones to ringtone music. Therefore, when music data for sounding incoming music is handled by a personal computer, copying and processing will be performed without the permission of the music data creator.
No effective means for preventing such unauthorized copying has been considered.

[0006]

Accordingly, the present invention provides a digital watermark embedding method for embedding digital watermark data in music data when downloading music data desired by a user to a terminal owned by the user. ,
There is provided a digital watermark embedding method, wherein the digital watermark data is data unique to the user.

A digital watermark embedding method for embedding digital watermark data in the music data when downloading music data desired by the user to a terminal owned by the user, wherein the digital watermark data is unique to the user. The present invention provides a digital watermark embedding method, characterized in that data included in a digital watermark is converted into encrypted data.

Further, when embedding the digital watermark data, a character string set by the user as a common key, data individually held by the terminal, or data for identifying the terminal when grouped is used. A digital watermark embedding method according to claim 1 or claim 2, wherein the method is used alone or in combination.

[0009] Furthermore, the digital watermark embedding method according to any one of claims 1 to 3, wherein the data unique to the user is a telephone number of a terminal owned by the user.

A music data reproducing method for reproducing music data in which digital watermark data is embedded by the digital watermark embedding method according to claim 1, wherein the digital watermark data extracted from the music and the user are reproduced. A music data reproducing method is provided, wherein the music is reproduced only when the unique data is matched.

A music data reproducing method for reproducing music data in which digital watermark data is embedded by the digital watermark embedding method according to claim 2, wherein the digital watermark data extracted from the music is decrypted. A music data reproduction method is provided wherein the music is reproduced only when the obtained data and the data unique to the user match.

Further, when the digital watermark data is read, a character string set by the user as a common key, data individually stored in the terminal, or data for identifying the terminal when grouped is used. The music data reproducing method according to claim 5, wherein the music data reproducing method is used alone or in combination.

Further, the music data reproducing method according to any one of claims 5 to 7, wherein the data unique to the user is a telephone number of a terminal owned by the user.

Furthermore, a terminal for requesting music data desired by a user, a watermark embedding encoder for embedding data inherent to the user as digital watermark data in the music data, and a request from the terminal in response to a request from the terminal. A server for distributing the music data in which the digital watermark data is embedded, receiving the music data distributed from the server, extracting digital watermark data from the music data, and identifying the digital watermark data and the user And a music data distribution system provided with a reproduction terminal that reproduces the music data only when the data has the same data.

[0015] Further, in a recording medium which can be read by a terminal which has recorded the music data, the data inherent to the user who owns the terminal is embedded in the music data as digital watermark data. To provide a readable recording medium.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a digital watermark embedding method, a music data reproducing method, a music data distribution method, and a recording medium according to the present invention will be described. In recent years, mobile phones and PH
The ring melody on a mobile terminal such as the S changes from one tone to a chord, and it is thought that in the near future it will become ringing music close to the actual music, and such ringing music includes drums, guitars, strings, bass,
Music utilizing various tones such as a piano can be played at the time of an incoming call. Further, the music can be used for a wide variety of purposes such as BGM, karaoke accompaniment, game music, etc. using the incoming music other than at the time of the incoming call.

A format shown in FIG. 2 has been proposed as a format in which performance information of incoming music composed of chords can be described. The format of this incoming music is one ID chunk, one header chunk, one sub chunk, and multiple track chunks.
nk). In the ID chunk, a character code composed of one byte of each of four characters “cmid” indicating this format is represented by a total of four bytes. Subsequent Data Length fields contain the ID
Header L of the header chunk that comes after the chunk
The total data length from the field described as “ength” to the last data of the entire file is described.

At the beginning of the header chunk,
A Length field is described. This describes the total data length from the Data Type Major field that follows the field to the last data of the sub-chunk. Data Type Major
The field describes the usage of the ring tone, etc.
In the ta Type Minor field, data indicating whether the performance information described in this format is a part of the music or all parts (full chorus) of the music is described.

The sub-chunk includes a byte length of one note message, a CUE POINT indicating an address to start sounding when a call arrives at the portable terminal, a copyright indication, a copy number indication indicating the number of copies of this file, Describe the title notation, date, version information, etc. of the song.

The actual performance information is described in the subsequent track chunks. In the header portion of the track chunk, a character code composed of one byte of each of four characters "trac" indicating the contents of the track is provided. This is represented by a total of 4 bytes, followed by track Le indicating the data length of Play Data of this track.
ngth is described. And Play Dat
“a” stores MIDI data in which digital watermark data is embedded.

Here, as for the copyright, a copyright indication and a copy count indication can be described in a sub-chunk. However, if this file is taken into a personal computer or the like, it can be easily rewritten. was there. Then, the file in which the above information is rewritten is used to create an illegally copied product called a pirated copy. As a technique for preventing such illegal copying, an encryption technique and a digital watermark technique are used.

The encryption technology is such that it cannot be decrypted without a key for decrypting (decrypting) it. However, an actual portable terminal is provided with such a decryption device, It becomes practically inconvenient, such as the need to manage individual keys. In addition, the basic concept of such encryption technology is that it takes an enormous amount of time to decrypt the data if all possible keys are used to decipher the data in order to break the encryption. And make it virtually indecipherable. However, there is a high possibility that a cipher will be broken eventually due to technological advances such as improvement of computer performance or devising a new decryption algorithm. Also, when the encryption is broken, the original data is leaked as it is.

On the other hand, in the digital watermarking technique, since the watermark data relating to the copyright is directly embedded in the content by changing a part of the content, it is necessary to partially destroy the content itself when removing the watermark data. Since the quality is impaired, when the watermark data is reproduced without being removed, the restoration value is not completely restored and the utility value as the content is greatly reduced. In such a digital watermark technology, illegal copy is prevented by utilizing this point.

According to the digital watermark embedding method of the present invention, the reproduction of the incoming music file is prevented from being illegally copied between users by making it impossible to reproduce the content unless there is a decoder for decoding the watermark data. Is what you do.

FIG. 1 is a block diagram for explaining an operation from embedding digital watermark data into a ringing music file by the digital watermark embedding method according to the present invention and then reproducing the ringing music file on the terminal side. In this embodiment, MIDI data is used as the incoming music file.

In the figure, a user selects a desired music from a list of music of incoming music displayed on a mobile phone 1 which is a terminal side, and makes a request to a server 2 of a service provider which distributes the incoming music. Perform (Step S1). At this time, the list of the music of the incoming music is stored in the server 2 even if it is stored in the terminal (the mobile phone 1 or a device connected to the mobile phone 1 or a personal computer used by the user). Is also good. Further, the terminal that makes the request may not be the mobile phone 1 that downloads the incoming music, but may be a dedicated terminal or a personal computer used by the user. The connection between the server 2 and the terminal may be wired or wireless, or may be connected through the Internet or the like. It should be noted that the user may be allowed to search for and directly select a desired music without being in the form of the list described above.

Here, for example, the telephone number of the mobile phone 1 is 0
Suppose that the user who is 90-1234-5678 requests the song "B" of artist A.

The incoming music file is stored in the mobile phone 1
In addition to the incoming music that rings when a call arrives, there is a possibility that it will be used as karaoke or BGM. A background image display function or the like used in such as may be provided. Of course, when not used as a karaoke, the lyrics character display function and the background image display function need not be provided.

First, a connection screen required for using various information providing services is called from the menu screen of the mobile phone 1, and a connection menu is displayed. Then, the connection from the mobile phone 1 to the server 2 is started, and the basic menu is displayed. Here, when a list for selecting music, such as an incoming music download list, a karaoke download list, or a BGM download list, is selected from the list displayed in the basic menu, the music is displayed in the form of a list. The song "B" of the artist A can be selected.

Here, when the song "B" of the artist A is found, the mobile phone 1 requests the server 2 to download the incoming music file. The server 2 receives this request. At this time, the user authentication unit (not shown) of the server 2 may perform a billing process for each song every time a user requests download. At this time,
It is also possible to perform the accounting process at the time of the download, and further, it is conceivable that the actual accounting process is performed after the download is completed in consideration of the case where the line is disconnected during the download. It is also possible to perform a billing process combining these.

Further, if the download service is a membership system, the member may be prompted to input a password to enhance security. Also, a mobile phone 1 as a terminal
For example, the identification of a member or not may be automatically performed based on the telephone number of the mobile phone 1 (090-1234-5678 in this embodiment).

When the user is authenticated and the download is permitted by the above-described procedure, the server 2 uses the data that can identify the individual user and uses the data as digital watermark data. Here, 090-1234-5678, which is the telephone number of the mobile phone 1, is used as digital watermark data.

On the server 2 side, the digital watermark data described above is embedded by the watermark embedding encoder 3 into the incoming music file “B” of the artist A. It temporarily embeds incoming music files to be downloaded to the user,
The digital watermark data is not embedded in the incoming music file stored in the server 2 itself. Therefore, the incoming music file of the song "B" of the original artist A itself does not change.

Since the contents of the identification data differ depending on the user, in this embodiment, the telephone number 090 of the mobile phone 1 is used.
-1234-5678 is used as individual identification data, which is embedded in the incoming music file as digital watermark data of 09012345678. Here, the incoming music file to be downloaded is MIDI data, and if performance information is described by MIDI, a method for embedding an electronic watermark in the MIDI data is performed by using a method described later (the above processing procedure is performed). Step S2).

The incoming music file in which the digital watermark data is embedded as described above is downloaded to the user terminal (mobile phone 1) (step S3).

In the mobile phone 1 which is the user's terminal side,
The incoming music file of the downloaded song "B" of artist A is passed through the watermark decoder 6 to read out the digital watermark data. It is checked whether the digital watermark data matches its own telephone number, and only when the digital watermark data matches, the reproduction of the incoming music file is permitted. The incoming music file permitted to be played is played by the playback sequencer 5, and the incoming music, karaoke,
It is reproduced for the purpose of BGM or the like (step S4).

Therefore, if the incoming music file is copied to a different terminal due to the user's illegal copy,
Even if an attempt is made to play on a terminal other than the terminal of the user who has requested the download, the reproduction cannot be performed because the terminal identification data (the telephone number of the mobile phone itself) does not match.

The incoming music file in which the digital watermark data is embedded by the digital watermark embedding method according to the present invention is copied to a hard disk device or the like used in a personal computer or the like, and is used by a mobile phone other than an authorized user. In such a case, after removing the digital watermark data, the telephone number of the mobile phone to be used must be re-embedded as digital watermark data, but this is a technically very difficult task, and even if this could be done, Since the quality of the music is greatly deteriorated, the value of the music used as incoming music is lost. Further, if an ID or the like unique to the hardware of the mobile phone body actually used is used as digital watermark data or used in combination with the above-described individual identification data (for example, a telephone number), further stronger unauthorized copy protection can be achieved.

Next, a specific example of providing the incoming music file will be described with reference to FIGS.

First, a packet communication connection is started on the terminal side such as the mobile phone 1 (step S11). In response to the connection request from the terminal, the server 2 permits the connection and transmits a basic service menu (step S12). The mobile phone 1 displays the basic service menu sent from the server 2 (step S13), and requests a menu for downloading the incoming music file (step S14).

In response to the request, the server 2 sends the incoming music search menu to the mobile phone 1 (step S15). The search menu is displayed on the mobile phone 1, and the user selects a desired incoming music based on the search menu (steps S16 to S18).

The mobile phone 1 requests the request for the selected incoming music to the server 2, and the server 2 performs processes such as user authentication, member authentication, charging and download permission (step S20), and download is permitted. If not, necessary procedures and warnings are displayed on the mobile phone 1 (step S21). If the download is permitted, the server 2 acquires the user's unique data, here, for example, the telephone number of the mobile phone 1 (step S22), and creates digital watermark data based on the unique data (step S22). S23) The digital watermark data is embedded in the incoming music file requested by the user (step S24). And mobile phone 1
Then, the incoming music file in which the watermark data is embedded is taken in (step S25).

Next, a specific embedding method of digital watermark data will be described. In this embodiment, the digital watermark data is, for example, the telephone number of the mobile phone 1, and the incoming music file is the MIDI data. For example,
The above-mentioned digital watermark data is embedded or added to the MIDI event in the MIDI data by adding or replacing the digital watermark data. The algorithm for embedding digital watermark data in MIDI data is not limited to this.

When encrypting the above-described digital watermark data or encrypting the MIDI data in which the digital watermark data is embedded, the digital watermark embedding algorithm can be concealed by using a common key.

Here, as the common key, an ID and a password set by the user, a unique hardware identification number owned by the mobile phone 1, and the like can be used. By using such a common key, even when MIDI data in which digital watermark data is embedded outside is extracted, it is possible to make the digital watermark data resistant to attacks. In particular, when it is not necessary to strengthen the common key, a fixed value such as “0000” is set.

Further, Japanese Patent Application No. Hei.
The above-described common key may be used as a password for encrypting data obtained by adding an error detection code to watermark data described in JP-A-1-302095.

For example, if the data that can be embedded as digital watermark data is 8 bytes, the data can be divided into 4 bits and a telephone number of up to 16 digits can be described. Alternatively, a telephone number once encrypted with the above-described common key may be used as 8-byte digital watermark data. In general, an algorithm for embedding digital watermark data gives an attacker of digital watermark data an algorithm for embedding digital watermark data and data with embedded digital watermark to an attacker of the digital watermark data. Since it is easy to decrypt the digital watermark data from the element, rather than using the telephone number itself as the digital watermark data, the telephone number is encrypted by using a one-way function, etc. be able to. Here, in addition to providing a common key individually for each user, for example, a mobile phone is divided into groups according to area, user attribute, model, manufacturer, etc., and a common key is generated based on information indicating the group. good.

In contrast to the above-described embodiment, information that is unlikely to be known to a third party such as a password and information unique to each user are used as digital watermark data, and a telephone number is used as a common key. May be.

In order to use the MIDI data in which the digital watermark data is embedded in another mobile phone, the data embedded as the digital watermark is first erased, and then the mobile phone of the mobile phone is used. Personal information such as numbers and passwords must be embedded again as digital watermark data.

Next, a method for reproducing incoming music in which digital watermark data is embedded by the digital watermark embedding method according to the present invention will be described with reference to FIGS.

First, a reproduction request for incoming music is issued by the cellular phone 1 in response to an incoming call detection, a performance request, and the like (step S101). In response to this request, a desired song is selected (designated) from the already-received incoming music files (step S102), and the file is read (step S103).

Next, the telephone number and the unique ID of the terminal stored in the mobile phone 1 are obtained (step S104), and the digital watermark data is extracted using the unique ID of the terminal as a common key (step S105). Then, it is determined whether or not the digital watermark data can be taken out (step S106). If the digital watermark data cannot be taken out (NG), the reproduction is stopped. Step S1
When the digital watermark data can be extracted at 06 (OK)
Compares the extracted digital watermark data with the telephone number extracted in step S105 to determine whether or not they match (step S107). If they do not match (NG)
In step S108, the reproduction is stopped, and if they match (NG), the incoming music file is transferred to the reproduction sequencer (step S108). At this time, the incoming music file may be transferred after removing the digital watermark.

In the above, the case where the incoming music file is used at the time of an incoming call of the mobile phone has been described as an example. However, when the incoming music file is used for karaoke or the like, respective data such as lyric character data downloaded at the same time. Digital watermark data individually embedded in
By enabling playback only when they all match,
Unauthorized copying can be more reliably prevented.

In the format of incoming music as shown in FIG. 2, MIDI data in which digital watermark data is embedded is stored in a track chunk.

[0055]

As described above, according to the digital watermark data embedding method according to the present invention, a telephone number, which is unique data of a terminal such as a mobile phone, is embedded as digital watermark data in an incoming music file. The terminal that can use the incoming music file is fixed so that the incoming music cannot be reproduced on a different terminal, and the illegal copying of the incoming music file can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the concept of a digital watermark embedding method and the concept of a music data reproduction method according to the present invention.

FIG. 2 is a diagram showing a format of incoming music.

FIG. 3 is a block diagram showing a specific example of providing a ringing music file.

FIG. 4 is a block diagram showing a method for reproducing an incoming music file in which digital watermark data is embedded by the digital watermark embedding method according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 mobile phone (terminal) 2 server 3 watermark embedding encoder 5 playback sequencer 6 watermark decoder

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Claims (10)

[Claims] 1. A digital watermark embedding method for embedding digital watermark data in music data when downloading music data desired by the user to a terminal owned by the user, wherein the digital watermark data is unique to the user. A digital watermark embedding method, characterized in that data is included in the electronic watermark. 2. A digital watermark embedding method for embedding digital watermark data in music data when downloading music data desired by the user to a terminal owned by the user, wherein the digital watermark data is unique to the user. A digital watermark embedding method characterized in that the data included in the electronic watermark is converted into encrypted data. 3. When embedding the digital watermark data, a character string set by the user as a common key, data individually included in the terminal, or data for identifying the terminal when grouped is used. 3. The digital watermark embedding method according to claim 1, wherein the digital watermark embedding method is used alone or in combination. 4. The digital watermark embedding method according to claim 1, wherein the data unique to the user is a telephone number of a terminal owned by the user. 5. A music data reproducing method for reproducing music data in which digital watermark data is embedded by the digital watermark embedding method according to claim 1, wherein the digital watermark data extracted from the music and the user are unique. A music data reproduction method, wherein the music data is reproduced only when the data of the music data match. 6. A music data reproducing method for reproducing music data in which digital watermark data is embedded by the digital watermark embedding method according to claim 2, wherein the digital watermark data extracted from the music is decrypted. A music data reproducing method, characterized in that the music is reproduced only when the obtained data and the data unique to the user match. 7. When reading out the digital watermark data, a character string set by the user as a common key, data individually stored in the terminal, or data for identifying the terminal when grouped is used. The music data reproducing method according to claim 5, wherein the music data reproducing method is used alone or in combination. 8. The music data reproducing method according to claim 5, wherein the data unique to the user is a telephone number of a terminal owned by the user. 9. A terminal for requesting music data desired by a user, a watermark embedding encoder for embedding data unique to the user as electronic watermark data in the music data, and an electronic device in response to a request from the terminal. A server for distributing the music data in which the watermark data is embedded, receiving the music data distributed from the server, extracting digital watermark data from the music data, and uniquely identifying the digital watermark data and the user. And a reproduction terminal that reproduces the data of the music only when the data has the same data. 10. A recording medium readable by a terminal storing music data, wherein data unique to a user who is the owner of the terminal is embedded in the music data as digital watermark data. Recording medium that can be read.