JP2003337751A - Contents protection system, contents protection program, and contents protection server - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contents protection system capable of protecting a production from illicit use even when the production is uploaded in a storage device server on the Internet and allowing access to the production for its use from various access points or terminal devices with different platforms. <P>SOLUTION: In this contents protection system, contents data and a mail address are received via a network 30, the contents data are encrypted, and to the encrypted contents data, an URL address is allocated to be stored, while the URL address is informed to the mail address. When a user makes access to the URL address to direct reproduction of the contents data, decryption is carried out and streaming is reproduced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content protection system, a content protection program, a content protection server, and more specifically, a content protection system and content protection capable of protecting a copyrighted work uploaded on the server. Program, content protection server.

[0002]

2. Description of the Related Art Due to the spread of the Internet, copyrighted works such as music data, photo data, moving image data, and document data have come to be distributed on the Internet. The current situation is that it has not been done. Especially MP3 (MPEG-1 / Audio Layer-3)
Free exchange of music data in file format has become a problem on the music industry side.

When storage device-related services have spread on the Internet, the network business company
There is a high demand from the music industry to protect a copyrighted material by an effective method, for example, for a malicious user who has published an MP3 file or the like on the storage device without proper authority.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to protect a copyrighted work even if the copyrighted work is uploaded to a storage device server on the Internet. In addition, a content protection system, a content protection program, and a content protection that can be used to access and use the copyrighted material from various access points or from terminal devices on different platforms. It is to provide a server.

[0005]

The content protection system of the first invention is a network (network 30).
Terminal device of the user (terminal device 61) connected via the
From the content data and the mail address, the receiving means (non-encrypted copyrighted work storage device 201), and the received content data is encrypted to encrypt means (encryption / encryption
A decryption server 202) and a storage means (encrypted copyright storage device) that assigns a URL (uniform resource locator) address to the encrypted content data and stores the encrypted content data in a storage area corresponding to the URL address. 203), notification means for notifying the assigned URL address to the mail address (encrypted copyrighted work storage device 203), and the stored encrypted content data of the stored encrypted content data in response to an access request to the URL address. When a transmission means (encrypted copyrighted work storage device 203) for transmitting a list screen to the access request source and an instruction to reproduce encrypted content data from the list screen are received, the instructed encrypted content data is decrypted. Decryption means (encryption / decryption server 202) and the decrypted content data It is a content protection system, characterized in that it includes a reproduction unit (encryption work storage device 203) to stream reproduction.

The content protection system of the second aspect of the invention is a receiving means (non-encrypted copyrighted work storage device 20) for receiving content data and a mail address of another terminal device from a user's terminal device connected via a network.
1), conversion means (content data translation server 204) for searching the file format and data structure of the received content data, and converting the content data into a file format that can be used by the other terminal device, and the conversion. The encryption means (encryption /
Decryption server 202), storage means for assigning a URL address to the encrypted content data, and storing the encrypted content data in a storage area corresponding to the URL address, and the assigned URL address for the mail address. Means for notifying the access request to the URL address, a transmitting means for transmitting the list screen of the stored encrypted content data to the access request source, and the encrypted content data from the list screen. When receiving the reproduction instruction of, the content protection system is provided with a decryption unit for decrypting the instructed encrypted content data and a reproduction unit for stream reproduction of the decrypted content data. .

The content protection system according to the third aspect of the invention comprises a receiving means for receiving content data from a user's terminal device connected via a network, an encryption means for encrypting the received content data, and Storage means for storing the encrypted content data in a storage area corresponding to the URL address assigned to the user, notifying means for notifying the terminal device of the user that the storage is completed, and the URL address In response to the access request to the access request, the transmitting unit that transmits the stored encrypted content data list screen to the access request source and the reproduction instruction of the encrypted content data from the list screen are received. Decrypting means for decrypting the encrypted content data, and the decrypted content data Stream is content protection system characterized by comprising a reproducing device for reproducing.

The content protection system according to the fourth aspect of the present invention is the content protection system according to any of the first to third aspects of the invention, wherein the terminal device that has accessed the notified URL address is authenticated to prevent unauthorized access. The content protection system further comprises an excluding means for excluding the content.

The content protection system according to the fifth aspect of the present invention is the content protection system according to the fourth aspect of the invention, wherein the excluding means authenticates the terminal device by the mail address of the terminal device. Content protection system.

The content protection system of the sixth invention is the content protection system according to any one of the first to fifth inventions, wherein the content data is music data such as karaoke data. It is a content protection system.

The content protection program according to the seventh aspect of the present invention includes a procedure for receiving content data and a mail address from a user terminal device connected via a network, a procedure for encrypting the received content data, and a procedure for encrypting the received content data. A step of assigning a URL address to the encrypted content data and storing the encrypted content data in a storage area corresponding to the URL address; a step of notifying the assigned URL address to the email address; In response to an access request to the access request, the procedure for transmitting the stored encrypted content data list screen to the access request source, and the instruction to reproduce the encrypted content data from the list screen are received. Procedure for decrypting encrypted content data and the decryption A content protection program characterized by comprising the steps of stream reproducing content data.

The content protection program of the eighth aspect of the invention is a procedure for receiving content data and a mail address of another terminal device from a user's terminal device connected via a network, a file format of the received content data, and A procedure for searching the data structure and converting the content data into a file format that can be used by the other terminal device, a procedure for encrypting the converted content data, and a URL address for the encrypted content data Assigning, storing the encrypted content data in a storage area corresponding to the URL address, notifying the assigned URL address to the mail address, and responding to an access request to the URL address, Display the list screen of the stored encrypted content data Access to the access request source, and when receiving a reproduction instruction of the encrypted content data from the list screen, a procedure of decrypting the instructed encrypted content data and a stream reproduction of the decrypted content data. It is a content protection program characterized by including a procedure.

The content protection program according to the ninth aspect of the present invention includes a procedure for receiving content data from a user terminal device connected via a network, a procedure for encrypting the received content data, and the encrypted content data. URL of content data assigned to the user
The stored encrypted content data in response to an access request to the URL address, a procedure of storing in a storage area corresponding to an address, a procedure of notifying the user of the completion of the storage Of transmitting the list screen to the access request source, and a procedure of decrypting the instructed encrypted content data when the reproduction instruction of the encrypted content data from the list screen is received, and the decrypted content. It is a content protection program, characterized in that it comprises a procedure for streaming reproduction of data.

The content protection server of the tenth aspect of the invention is a server connected to a network, and receiving means for receiving content data and a mail address from a terminal device of a user connected via the network,
The encryption means for encrypting the received content data, the URL address for the encrypted content data, the storage means for storing the encrypted content data in the storage area corresponding to the URL address, and the assigned Notifying means for notifying the URL address to the mail address, transmitting means for transmitting a list screen of the stored encrypted content data to the access request source in response to an access request to the URL address, and the list Upon receiving an instruction to reproduce the encrypted content data from the screen, the decryption means for decrypting the instructed encrypted content data and the reproducing means for playing the stream of the decrypted content data are provided. Content protection server.

The content protection server of the eleventh invention is a server connected to a network and receives content data and a mail address of another terminal device from a terminal device of a user connected via the network. Means, a conversion means for searching the file format and data structure of the received content data and converting the content data into a file format usable by the other terminal device, and an encryption means for encrypting the converted content data. And a URL for the encrypted content data
A storage unit that assigns an address and stores the encrypted content data in a storage area corresponding to the URL address, a notification unit that notifies the assigned URL address to the mail address, and an access request to the URL address. In response to this, when transmitting means for transmitting the stored encrypted content data list screen to the access request source and a reproduction instruction of the encrypted content data from the list screen, the instructed encrypted content data is received. The content protection server is provided with a decryption unit for decrypting the encrypted content data and a reproduction unit for reproducing the decrypted content data in a stream.

The content protection server of the twelfth invention is a server connected to a network, and receiving means for receiving content data from a terminal device of a user connected via the network, and the received content data. And an URL for assigning the encrypted content data to the user.
Storage means for storing in a storage area corresponding to the address, notification means for notifying the user of the completion of the storage to the terminal device of the user, and the stored encryption in response to an access request to the URL address. Transmitting means for transmitting a list screen of content data to the access request source, and decrypting means for decrypting the instructed encrypted content data when receiving a reproduction instruction of the encrypted content data from the list screen, The content protection server is provided with a reproducing means for reproducing the decrypted content data in a stream.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference characters and description thereof will not be repeated.

An outline of a content protection system according to an embodiment of the present invention will be described with reference to FIG. The content protection system 20 includes a non-encrypted copyrighted work storage device 20 installed on a network 30 such as the Internet.
1. The encryption / decryption server 202 and the encrypted copyrighted material storage device 203 function as a storage server with a copyrighted material protection function that also serves as a Web server.

The non-encrypted copyrighted work storage device 201 is music data such as karaoke data uploaded from the user's terminal devices 51, 52, 53, 61, 62, 71 and the like,
A transmission / reception unit 2011 that receives content data such as photo data, moving image data, and document data, and an unencrypted copyrighted work storage unit 2012 that stores the received content data are provided.

The encryption / decryption server 202 has a secret key, and encrypts the non-encrypted content data stored in the non-encrypted copyrighted work storage device 201 based on the public key created from the secret key. Encrypted and transmitted to the encrypted copyrighted work storage device 203, and the encrypted content data stored in the encrypted copyrighted work storage device 203 is decrypted by the secret key to generate the encrypted copyrighted work storage device 2
It has a function to reply to 03.

The encrypted copyrighted work storage device 203 receives an access request from the user's terminal device 51, 52, 53, 61, 62, 71, etc., and requests the URL (un
HP (home pag) of iform resource locator address
e) The screen is transmitted to the terminal device of the user who has made the access request. At that time, the requested terminal device 51, 5
2, 53, 61, 62, 71 are requested to send mail addresses, and the terminal devices 51, 52, 53, 61, 62, 71 are authenticated based on the sent mail addresses, and authentication is performed. The unauthorized access is excluded by displaying the HP screen only when the unauthorized access is made. Then, when a valid terminal device makes a reproduction request for a specific content from the content list displayed on the HP, the corresponding content is read from the encrypted copyrighted work storage unit 2032 described later, and the encryption / decryption is performed. A transmission / reception unit 2031 that transmits the decrypted content data to the encryption server 202, performs streaming reproduction of the decrypted content data, and transmits the encrypted content data to the user who has issued the access request, and the encrypted content received from the encryption / decryption server 202. A URL address is assigned to the content data, and the assigned U
Encrypted copyrighted work storage unit 20 for storing the encrypted content data in a storage area associated with an RL address
32 are provided. In addition, the encrypted copyrighted material storage unit 203
2 includes a TRM (Tamper Resistant Module) area, and the encrypted content data is stored in the TRM area. Since the encrypted content data is stored in the TRM area in this way, it is prohibited to take it in or copy it to a personal computer with a reader / writer or the like.

In the above example, the non-encrypted copyrighted work storage device 201, the encryption / decryption server 202, and the encrypted copyrighted work storage device 203 are described as separate components, but they can be implemented by a single server. It may be configured.

Reference numerals 41, 42, and 43 denote access points, 51, 52, and 53 are user terminal devices such as mobile phones capable of browsing the Internet, and 100 is a base station.

Reference numerals 61 and 62 denote LCDs which also serve as touch panels.
Equipped with an input display unit such as a web browser (Internet E
xplorer, Netscape Navigator, etc.) is the user's terminal device, and the main body has portability,
The size is about B5. The input display unit is preferably a color liquid crystal panel integrated with a touch panel having a size of about 7.8 inches in consideration of the readability of e-mail documents and homepage screens on the Internet, operability on the screen, and durability. It is adopted.

Reference numeral 71 denotes a user's terminal device which is a desktop type computer in which a Web browser is installed. 80 is a mail server.

Next, the content data is uploaded from the user's terminal device 61, and the content protection system 2
The flow of processing when the content data is used on the Internet will be described based on the flowchart of FIG.

The user uploads content data such as music data to the non-encrypted copyrighted work storage device 201 via the network 30 (step 101, hereinafter step is abbreviated as S, the same in the drawings). still,
The user sends an e-mail address (in this embodiment, the e-mail address of the user's terminal device 61) that receives the notification of the storage location of the content together with the content data so that the uploaded content data can be used later.

The transmitted content data is received by the transmission / reception unit 2011 of the non-encrypted copyrighted work storage device 201 and sequentially stored in the non-encrypted copyrighted work storage unit 2012.
Then, the received content data is encrypted and
It is transmitted to the decryption server 202 (S102).

The encryption / decryption server 202 creates a public key using the private key, encrypts the received content data using the public key, and encrypts the encrypted content data. Send to storage device 203 (S
103).

Upon receiving the encrypted content data, the encrypted copyrighted work storage device 203 assigns a URL address to the content data, and encrypts the content in the storage area associated with the assigned URL address. Store content data. Then, the assigned URL address is described in an e-mail and sent to the mail address designated by the user (S104).

The e-mail is sent to the destination terminal device (in this example, the user's terminal device 6) via the mail server 80.
1) is transmitted (S105).

In the terminal device 61 of the user, after receiving the notification of the URL address of the storage destination of the content data, if the user wants to use the content data, the URL address is accessed (S106).

The encrypted copyrighted work storage device 203 stores the UR
When the access request for the L address is received, the user's terminal device 61 is instructed to input the mail address (S107), and when the user's terminal device 61 inputs the mail address (S108), It is verified whether the mail address matches the mail address of the notification destination of the URL, and if they match, the HP screen corresponding to the URL address is displayed on the user terminal device 61 of the user terminal device 61. Send to (S
109).

The HP displayed on the terminal device 61 by the user
When the reproduction of the content is instructed from (S110), the encrypted copyrighted work storage device 203 reads the corresponding content data from the encrypted copyrighted work storage unit 2032 and transmits it to the encryption / decryption server 202 (S111).

The encryption / decryption server 202 decrypts the encrypted content data using the secret key and sends it back to the encrypted copyrighted work storage unit 203 (S11).
2).

The encrypted work storage unit 203 streams the decrypted content data.
It is reproduced and transmitted to the user's terminal device 61 (S11).
3).

As a result, the user can upload the content from the terminal device 61 and use (streaming playback) the content data uploaded to the content protection system 20.

The user of the terminal device 61 transfers the URL address notified from the encrypted copyrighted work storage unit 203 to the terminal devices 62 and 71 of the other users, so that the terminal devices 62 of the other users are Even from 71, the user of the terminal device 61 can use (streaming reproduction) the content data uploaded to the content protection system 20.

Here, the content data uploaded from the terminal device 61 to the content protection system 20 is transferred to a terminal device having a different platform, for example,
It is convenient if it can be used from the mobile phones 51, 52, 53, but in many cases it cannot be used because the basic software and hardware are different platforms.

Therefore, a system configured so that protected content data can be used between terminal devices of different platforms will be described based on the system configuration diagram of another embodiment of FIG.

FIG. 2 shows the content data translation server 2
04 is provided between the non-encrypted copyrighted work storage device 201 and the encryption / decryption server 202.

The content data translation server 204 converts the content data uploaded by the user's terminal device 61 into a file format that can be displayed by the mobile phones 51, 52, 53 (displayable by a Web browser for mobile phones). For example, image data is converted into a JPEG file, and word processing documents such as words are converted into HTML format files.

Therefore, the content data translation server 20
Reference numeral 4 includes a file type determination unit that detects the file extension of the content data, and a translation unit.

The file type determination unit includes "doc", "xls", which are included in the file name of the content data,
"Zip", "mime", "ppt", "pd"
The extension indicating the file type such as f "," cam "," j6i "," tif "," bmp "is detected, and the data structure of the content data is analyzed.

Further, the translation unit converts the content data into a file that can be displayed on the mobile phones 51, 52, 53, etc. based on the file format of the content data searched by the file type determination unit and the analysis result of the data structure. To do.

By converting the uploaded content data into a file format that can be displayed on a terminal device of a different platform, the mobile phone 51, 52, 53 can also use the content data. .

Next, in the system shown in FIG. 2, the flow of processing when the content data uploaded from the user's terminal device 61 is used from the portable telephone 51 will be described based on the flowchart of FIG.

The user uploads content data such as music data to the non-encrypted copyrighted work storage device 201 via the network 30 (step 201).
The user transmits the e-mail address of the mobile phone 51 that receives the notification of the storage destination of the content together with the content data so that the uploaded content data can be used by the mobile phone 51.

The transmitted content data is received by the transmission / reception unit 2011 of the non-encrypted copyrighted work storage device 201 and sequentially stored in the non-encrypted copyrighted work storage unit 2012.
Then, the received content data is transmitted to the content data translation server 204 (S20).
2).

The content data translation server 204 searches the file format of the content data, analyzes the data structure, and converts the content data into a file format that can be displayed on the mobile phone 51 based on the search and analysis results. To do. Then, the converted content data is transmitted to the encryption / decryption server 202 (S203). The encryption / decryption server 202 creates a public key using the private key, and receives the converted content data. Encryption is performed using the public key, and the encrypted content data is transmitted to the encrypted copyrighted work storage device 203 (S2).
04).

Upon receiving the encrypted content data, the encrypted copyrighted work storage device 203 assigns a URL address to the content data, and encrypts the content in the storage area associated with the assigned URL address. Store content data. Then, the assigned URL address is described in an email to the email address received from the user and transmitted (S
205).

The electronic mail is transmitted to the destination terminal device (the mobile phone 51 in this example) via the mail server (S206).

After receiving the notification of the storage destination URL address of the content data, the mobile phone 51 of the user accesses the URL address when using the content data (S207).

The encrypted literary work storage device 203 stores the UR
When the access request for the L address is received, the mobile phone 51 of the user is instructed to input the mail address (S208), and the mobile phone 51 of the user is input.
When an email address is entered from (S209),
It is verified whether the email address matches the email address of the notification destination of the URL, and if they match,
An HP screen corresponding to the URL address is transmitted to the user's mobile phone 51 with respect to the user's terminal device 61 (S210).

The H displayed on the mobile phone 51 by the user
When the reproduction of a specific content is instructed from the content list described in P (S211), the encrypted copyrighted work storage device 203 reads the corresponding content data from the encrypted copyrighted work storage unit 2032, and the encryption / decryption server 20
2 (S212).

The encryption / decryption server 202 decrypts the encrypted content data using the private key and sends it to the encrypted copyrighted work storage unit 203 (S213).

The encrypted copyrighted-material storage unit 203 streams the decrypted content data.
Playback and send to the user's mobile phone 51 (S21
4).

As a result, the user can upload the content from the mobile phone 51 and reproduce the content data uploaded to the content protection system 20.

In the above example, when the content data is uploaded, the URL address of the storage destination is determined and the user is notified by e-mail. However, the URL address of the storage destination corresponding to the user is previously set. It is also possible to decide and notify and omit notification of the URL address for each upload. Further, by registering the mail address of the notification destination of the URL address in advance corresponding to the user, it is possible to omit the notification of the URL address when uploading the content. The notification destination email address may be configured to read the corresponding email address from the database and notify it by designating the notification destination user name without notification of the email address itself.

Further, in the above example, in order to exclude an unauthorized user, the authentication is performed by using the mail address, but it is also possible to utilize another personal authentication mechanism, and the authentication is also possible. It is also possible to perform the timing of when the reproduction instruction is issued.

It is also possible to construct a communication karaoke system by using the content data to be uploaded as karaoke data and making the notification destination of the URL address a registered user of communication karaoke. When the latest karaoke data is uploaded, a document notifying the fact may be sent together with the URL address notification mail.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[0063]

According to the present invention, even if a copyrighted work is uploaded to a storage device server on the Internet,
You can protect the work and protect it from unauthorized use,
Furthermore, by accessing the copyrighted work from various access points or terminal devices on different platforms,
It is possible to provide a content protection system, a content protection method, and a content protection server that can be used.

[Brief description of drawings]

FIG. 1 is a schematic diagram for conceptually explaining a content protection system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for conceptually explaining a content protection system according to another exemplary embodiment of the present invention.

3 is a flowchart showing a processing flow of the content protection system shown in FIG.

FIG. 4 is a flowchart showing a processing flow of the content protection system shown in FIG.

[Explanation of symbols] 20 Content protection system 201 Non-encrypted work storage device 2011 Transmitter / Receiver 2012 Non-encrypted work storage 202 encryption / decryption server 203 encrypted work storage device 2031 transmitter / receiver 2032 encrypted work storage 204 Content data translation server 30 network 41, 42, 43 access points 51, 52, 53 mobile phones 61,62 portable terminal device 71 Desktop type terminal 80 mail server

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09C 1/00 660 G09C 1/00 660D G10L 19/00 G10L 9/00 N H04N 7/167 H04N 7/167 Z (72) Inventor, eleventh teacher, 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Denki Co., Ltd. F-term (reference) 5B017 AA03 BA07 CA07 CA16 5B075 ND20 UU40 5B082 GA02 HA05 HA08 5C064 BA07 BB02 BC06 BC17 BC18 BC22 BC23 BC25 BD02 BD08 BD09 CA14 CA16 CB01 CC04 5J104 AA07 AA12 KA02 PA14

Claims (12)

[Claims] 1. A receiving means for receiving content data and a mail address from a user's terminal device connected via a network, an encrypting means for encrypting the received content data, and the encrypted content data. URL (uniform reso
urce locator) address, and storage means for storing the encrypted content data in a storage area corresponding to the URL address; notification means for notifying the assigned URL address to the mail address; In response to the access request, a transmitting unit that transmits the stored encrypted content data list screen to the access request source, and when receiving a reproduction instruction of the encrypted content data from the list screen, the instructed encryption A content protection system comprising: a decrypting unit for decrypting the encrypted content data; and a reproducing unit for streaming the decrypted content data. 2. Receiving means for receiving content data and a mail address of another terminal device from a user's terminal device connected via a network, and searching a file format and a data structure of the received content data, A conversion unit that converts the content data into a file format that can be used by the other terminal device, an encryption unit that encrypts the converted content data, a URL address is assigned to the encrypted content data, and the URL A storage unit that stores the encrypted content data in a storage area corresponding to an address, a notification unit that notifies the assigned URL address to the mail address, and the storage unit that stores the URL address in response to an access request to the URL address. Send a list screen of encrypted content data to the access request source. And a decoding means for decoding the instructed encrypted content data when receiving a reproduction instruction of the encrypted content data from the list screen, and a reproducing means for reproducing the decrypted content data in a stream. A content protection system comprising: 3. A receiving means for receiving content data from a user terminal device connected via a network, an encryption means for encrypting the received content data, and the encrypted content data, Storage means for storing in a storage area corresponding to the URL address assigned to the user, notification means for notifying the user of the storage device that the storage is completed, and in response to an access request to the URL address, Transmitting means for transmitting the stored encrypted content data list screen to the access request source, and decrypting the instructed encrypted content data when receiving a reproduction instruction of the encrypted content data from the list screen And a reproducing means for reproducing the decoded content data in a stream. A content protection system characterized in that 4. The content protection system according to claim 1, further comprising an excluding means for authenticating a terminal device that has accessed the notified URL address and excluding unauthorized access. A content protection system characterized in that 5. The content protection system according to claim 4, wherein the excluding means authenticates the terminal device by a mail address of the terminal device. 6. The content protection system according to claim 1, wherein the content data is music data such as karaoke data. 7. A receiving procedure for receiving content data and a mail address from a terminal device of a user connected via a network, an encryption procedure for encrypting the received content data, and the encrypted content data. A storage procedure for allocating a URL address to a storage area for storing the encrypted content data in a storage area corresponding to the URL address, a notification procedure for notifying the allocated URL address to the email address, and an access to the URL address. In response to the request, a transmission procedure of transmitting the stored encrypted content data list screen to the access request source, and when receiving a reproduction instruction of the encrypted content data from the list screen, the designated encryption is performed. A decryption procedure for decrypting the content data, and the decrypted content A content protection program, comprising: a playback procedure for streaming playback of content data. 8. A procedure for receiving content data and a mail address of another terminal device from a user's terminal device connected via a network, and a file format and data structure of the received content data are searched for, A procedure of converting the content data into a file format that can be used by the other terminal device, a procedure of encrypting the converted content data, a URL address is assigned to the encrypted content data, and a URL address corresponding to the URL address is assigned. A step of storing the encrypted content data in a storage area; a step of notifying the assigned URL address to the e-mail address; and a step of notifying the stored encrypted content data in response to an access request to the URL address. A procedure for transmitting a list screen to the access request source, When receiving an instruction to reproduce the encrypted content data from the remote screen, the procedure includes the step of decrypting the instructed encrypted content data and the step of stream-reproducing the decrypted content data. Content protection program. 9. A procedure for receiving content data from a user terminal device connected via a network, a procedure for encrypting the received content data, and the encrypted content data assigned to the user. Stored in a storage area corresponding to the stored URL address, notification means for notifying the user of the completion of the storage to the terminal device of the user, and stored in response to an access request to the URL address. A step of transmitting a list screen of encrypted content data to the access request source; a step of decrypting the instructed encrypted content data upon receiving a reproduction instruction of the encrypted content data from the list screen; And a procedure for reproducing the decrypted content data in a stream. Protection program. 10. A server connected to a network, receiving means for receiving content data and a mail address from a terminal device of a user connected via the network, and encryption for encrypting the received content data. Encryption means, a storage means for allocating a URL address to the encrypted content data, and storing the encrypted content data in a storage area corresponding to the URL address, and notifying the allocated URL address to the mail address Notification means, transmission means for transmitting the stored encrypted content data list screen to the access request source in response to an access request to the URL address, and instruction for reproducing encrypted content data from the list screen Is received, the specified encrypted content data is A content protection server comprising: a decryption unit for decrypting and a reproducing unit for reproducing the decrypted content data in a stream. 11. A server connected to a network, which receives content data and a mail address of another terminal device from a user's terminal device connected via the network, and a receiving unit for receiving the received content data. A conversion unit that searches the file format and the data structure and converts the content data into a file format that can be used by the other terminal device; an encryption unit that encrypts the converted content data; A storage unit that assigns a URL address to the content data and stores the encrypted content data in a storage area corresponding to the URL address; a notification unit that notifies the assigned URL address to the email address; The stored encrypted content in response to the access request of Transmitting means for transmitting a list screen of data to the access request source; decryption means for decrypting the instructed encrypted content data when receiving a reproduction instruction of the encrypted content data from the list screen; A content protection server, comprising: a playback unit that streams the decrypted content data. 12. A server connected to a network, the receiving means receiving content data from a terminal device of a user connected via the network, and an encryption means for encrypting the received content data. Storage means for storing the encrypted content data in a storage area corresponding to the URL address assigned to the user; notification means for notifying the user of the completion of the storage to the terminal device of the user; In response to the access request to the URL address, the transmitting unit that transmits the stored encrypted content data list screen to the access request source, and when receiving the reproduction instruction of the encrypted content data from the list screen, Decryption means for decrypting the instructed encrypted content data, and the decrypted content Content protection server, characterized by comprising reproduction means for stream play over data.