JP2001136160A - Contents service method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute contents from a contents provider to a user with security on a network whose security is not sufficient and to allow only a specific user to utilize the contents. SOLUTION: Utilizing ID information assigned in advance to a translation processing unit, distributed contents are converted into an intermediate code. An identifier obtained from ID information of a translation processing unit of a user is compared with an identifier included in the intermediate code to discriminate whether the translation processing unit of the user receiving the intermediate code can translate the intermediate code. Furthermore, encrypted contents and also a decoding program to decode them are distributed in terms of the intermediate code to the user and the user utilizes the decoding program to decode the contents.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content providing method for providing content via a network,
In particular, the present invention relates to a method of distributing contents so that only specific users specified by a provider can use the contents.

[0002]

2. Description of the Related Art With the spread of the Internet in recent years, there has been an increasing demand for safely providing contents via the Internet. Depending on the content,
For example, it is considered that there are many pieces of information that need to be charged or that do not want to be disclosed to a specific party. It is also conceivable that important data such as personal information such as a password and a credit card number, besides the content, is transmitted on the network. Clearly, there is a danger in passing such content or data over an insecure network.

Conventionally, in order to securely transfer contents and personal information, a provider has used a password to encrypt the contents or convert the contents into an intermediate code that can be translated by a specific device. Then, the user receives the encrypted content and decrypts the content using a decryption program already stored. In the present invention,
The host that provides the content is called the provider, and the client that requests and receives the content is called the user.

Conventionally, a provider has an intermediate code generation device, and a user has a translation processing device. The provider generates and distributes intermediate code for the virtual processor using the intermediate code generation device. The user receiving the intermediate code translates the intermediate code into a format usable by the user, such as a machine language, using a translation processing device.

When a program is translated into a machine language, an intermediate code is generated from the program by first inputting the program to an intermediate code generation device for generating an intermediate code. The intermediate code targets the virtual processor,
Programs written in intermediate code run on virtual processors. The intermediate code has a format that does not depend on the real processor, and the provider can provide the program without worrying about the environment such as the type of the real processor used by the user. By translating the received intermediate code by the translation processing device of the user, the intermediate code is unconditionally converted into machine language.

[0006]

However, in the conventional content providing method, it is necessary for the user to always hold an encrypted password and a decryption program for decrypting the content. Further, when there is a possibility that content may be obtained from a plurality of providers, it is necessary to maintain different decryption programs by the number of providers.

Further, when an intermediate code is distributed only to a specific user on a network with insufficient security, the intermediate code may be received by a person other than the specific user due to theft, a distribution error, or the like. is there. Conventional translation processors translate intermediate codes unconditionally, so if the person receiving the intermediate code has the same type of translation processor, machine language can be easily generated from the intermediate code, There is also a risk that the generated executable program will be used illegally.

[0008] It is an object of the present invention to distribute content safely from a content provider to a user on a network where security is not sufficient, so that only a specific user can use the content.

According to the present invention, an intermediate code is created on a provider side so that only a specific user can translate it into a machine language or the like, so that an intermediate code can be delivered to the user by using any communication means. An object of the present invention is to allow a user to use a program translated from an intermediate code with ease.

[0010]

In view of the above-mentioned conventional problems, in the present invention, an encrypted content or data and a program code for decrypting the encrypted content or data are distributed as an intermediate code. In the present invention, even if a decryption program delivered by an intermediate code is stolen, the intermediate code is translated into machine language so that the intermediate code cannot be translated except by the user designated by the provider. A step is provided for determining whether or not to perform a translation process by the processing device. When determining whether or not translation processing is possible by the translation processing apparatus, unique ID information such as a serial number is assigned to all translation processing apparatuses.

[0011] In view of the above conventional problems, the present invention provides:
A step of adding information for identification into the intermediate code and determining whether or not translation processing is possible by a user's translation processing device is provided. Unique ID information such as a serial number is assigned to all translation processing devices so that the translation processing device can determine whether or not to perform translation processing.

That is, according to the present invention, each of the translation processing devices of the user and the provider has ID information so that the translation processing devices can be identified, and all the translation processing devices can understand. A content providing method having common information, wherein the user requests content from the provider, encrypting the content in an encryption device of the provider, and translating the content. Obtaining from the translation processing device of the user the ID information previously assigned to the translation processing device so that the processing device can be identified; and an intermediate code translatable only by the translation processing device of the user. Or whether to generate an intermediate code that can be translated by the translation processing device of all users; and
(A) When generating an intermediate code that can be translated only by the user's translation processing device, (a-i) input a decryption program for decrypting the encrypted content and the ID information to the intermediate code generation device (A-ii)
The intermediate code generation device generates an intermediate code from the decryption program and the ID information; and (b) generating an intermediate code that can be translated by a translation processing device of all users; i) inputting a decryption program for decrypting the encrypted content and the common information to an intermediate code generation device;
-Ii) in the intermediate code generation device, a step of generating an intermediate code from the decryption program and the common information, and the intermediate code generated in one of the two steps of generating the intermediate code. Delivering the encrypted content to the user, receiving the intermediate code by the user, and based on the ID information or the common information of the translation processing device of the user. (C) determining whether the intermediate code has been sent to the user; and (c) determining that the intermediate code has been sent to the user. (C) converting the intermediate code by performing a translation process to obtain the decryption program; and (c-ii) the content encrypted by the decryption program. A step of decoding, (d)
If it is determined that the intermediate code is not sent to the user, a content providing method is provided that includes: (d-i) discarding the intermediate code and the encrypted content. .

According to the present invention, each of the translation processing apparatuses of the user and the provider has ID information so that the translation processing apparatuses can be identified, and all the translation processing apparatuses can understand. A content providing method having common information, wherein the user requests content from the provider, inputting the content to an intermediate code generation device, and the intermediate code generation device Generating, from the translation processing device of the user, the ID information previously assigned to the translation processing device so that the translation processing device can be identified; and the translation processing device of the user. Decide whether to generate an intermediate code that can be translated only by, or to generate an intermediate code that can be translated by all users' translation processors. (A) when generating an intermediate code that can be translated only by the user's translation processing device, (a-i) the provider's pseudo header generation device generating a pseudo header from the ID information; , (B)
(B-i) a step in which the pseudo-header generating device of the provider generates a pseudo-header from the common information, wherein the pseudo-header generating device generates a pseudo-header from the common information; The identifier calculating device of the provider calculates an identifier from the pseudo header and the intermediate code generated in one of the two generating steps, a step of embedding the identifier in the intermediate code, Delivering the embedded intermediate code to the user, receiving the intermediate code by the user, and generating a pseudo-header of the user by using the ID information or the translation processing device of the user. Generating a pseudo-header based on the common information; and generating a pseudo-header generated by the user's pseudo-header generation device. Calculating the identifier from the intermediate code by the user identifier calculating device; and comparing the identifier embedded in the intermediate code with the identifier calculated by the user identifier calculating device. (C) if the compared identifiers match, (c-i) performing a translation process to convert the intermediate code, and (d) if the compared identifiers do not match, (d-i) Discarding the intermediate code.

According to the present invention, each of the translation processing devices of the user and the provider has ID information so that the translation processing devices can be identified, and all the translation processing devices can understand. A content providing method having common information, wherein the user requests content from the provider, and wherein the translation processing device is pre-assigned to the translation processing device so that the translation processing device can be identified. Acquiring ID information from the translation processing device of the user, and generating an intermediate code translatable only by the translation processing device of the user, or generating an intermediate code translatable by the translation processing device of all users; And (a) when generating an intermediate code translatable by a translation processing device of a specific user, (a-i)
Inputting the content and the ID information to an intermediate code generation device; (a-ii) generating an intermediate code from the content and the ID information by the intermediate code generation device; (B-i) when generating an intermediate code that can be translated by the translation processing device of the user
Inputting the content and the common information to an intermediate code generation device; (b-ii) the intermediate code generation device generating an intermediate code from the content and the common information; and generating the intermediate code. Delivering the intermediate code and the encrypted content generated in one of the two steps to the user; receiving the intermediate code by the user; Judging whether the intermediate code is sent to the user based on the ID information or the common information of the translation processing device; and (c) determining whether the intermediate code is addressed to the user. (C) performing a translation process to convert the intermediate code,
(D) when it is determined that the intermediate code has not been sent to the user, (d-i) discarding the intermediate code.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A first embodiment according to a content providing method of the present invention will be described below with reference to the drawings. FIG. 8 is a schematic diagram illustrating a configuration of a device owned by a provider and a user according to the first embodiment of the content providing method of the present invention. The provider has an intermediate code generation device 10 and an encryption device 12,
The user has a translation processing device 14. The provider has a recording medium 18 on which the content 24 and the decryption program 26 are recorded.

The translation processor 14 has, for example, 16-byte ID information having a serial number in the upper 8 bytes and a user password in the lower 8 bytes. This ID information is incorporated in the translation processing apparatus in advance so that a specific one of the plurality of translation processing apparatuses can be detected. The present invention has a mechanism for translating only an intermediate code that can be decoded by using the ID information. If the intermediate code cannot be decoded by the ID information of the translation processing device 14, the translation processing device 14 rejects the translation. Further, all the translation processing devices 14 hold common information, and the translation of the intermediate code is unconditionally permitted by using this common information.

FIG. 1 is a flow chart showing a flow of processing of a provider from a step of receiving a request for content to a step of delivering an intermediate code in the first embodiment according to the content providing method of the present invention. . Step S
At 111, the provider receives a content request from a user. In step S113, the content requested by the user in step S111 is encrypted by the encryption device 12 of the provider. In step S115, the provider connects via the network
The ID information included in the translation processing device 14 owned by the user is acquired. The translation processing device 14 is assigned unique ID information such as a serial number. If the provider holds the ID information of the translation processing device 14 of the user in advance, there is no need to perform step S115.

In step S116, it is determined whether an intermediate code that can be translated only by the translation processing device 14 of the user or an intermediate code that can be translated by the translation processing device 14 of all users is generated. That is, it is determined whether only a specific user can translate or all users can translate. This determination can be made, for example, by the user or by the provider. It is also possible to set to always send to either one, for example, only to a specific user. When an intermediate code that can be translated by the translation processing device 14 of a specific user is generated, in step S117, the decryption program that decrypts the encrypted content and the ID information acquired in step S115 are used to generate the intermediate code. 1
Enter 0. In step S119, the intermediate code generation device 10 generates an intermediate code that can be translated only by the translation processing device 14 of the specific user from the decryption program and the ID information input in step S117. on the other hand,
If an intermediate code that can be translated by the translation processing devices 14 of all users is generated without limiting the users, step S
In 121, a decryption program for decrypting the encrypted content and information common to all the translation processing devices 14 are input to the intermediate code generation device 10. In step S123, the intermediate code generation device 10 generates an intermediate code that can be understood by all the translation processors 14 from the decoding program and the common information input in step S121. In step S125, the intermediate code generation device 10 proceeds to step S119 or step S123
And the content encrypted in step S113 is distributed to the user via the network. For example, when the content is divided and distributed continuously in a plurality of times, the decryption program and the encrypted content may be distributed first, and then only the encrypted content may be distributed.

FIG. 2 is a flow chart showing a flow of a user's process from the step of receiving an intermediate code to the end of the process according to the first embodiment of the content providing method of the present invention. In step S127, the user
Receive the encrypted content and the intermediate code from the provider via the network. In step S129, the user's translation processing device 14 determines whether the received intermediate code is an intermediate code sent to itself based on ID information or common information of the user's translation processing device 14. to decide. If it is determined that the intermediate code has been sent to itself and can be translated using the ID information or common information of the translation processing device 14 of the user, the translation process is performed in step S131 to The intermediate code is converted into a format that can be used by the user, such as words, to obtain a decryption program. In S135, the encrypted content is decrypted by the decryption program, and the process ends. When step S131 ends, the user obtains the encrypted program and the decryption program. On the other hand, if it is determined that the intermediate code is not sent to itself and cannot be translated by the user's translation processing device 14, in step S133, the received intermediate code is transmitted only to a specific user other than the user. It recognizes that it is distributed, discards the received intermediate code and the encrypted content, and ends the processing.

Using a decryption program, step S13
The method of decrypting the content performed in step 5 is the same as the conventional method. For example, the decrypted content can be converted into a reference language serving as a reference by a reference process. In addition, the program to be distributed together with the decrypted content is not limited to the decryption program, and for example, a program that refers to the decrypted content can be sent.

<Second Embodiment> A second embodiment according to the content providing method of the present invention will be described below with reference to the drawings. FIG. 9 is a schematic diagram illustrating a configuration of a device owned by a provider and a user according to the second embodiment of the content providing method of the present invention. The provider has an intermediate code generation device 10, a pseudo header generation device 20, and an identifier calculation device 22, and the user has a translation processing device 14, a pseudo header generation device 20, and an identifier calculation device 22. It is preferable that the pseudo-header generating device 20 and the identifier calculating device 22 are installed in the translation processing device 14 or are incorporated in the translation processing device 14 as a program. Further, the provider has a recording medium 18 on which the content 24 is recorded.

The translation processor 14 has, for example, 16-byte ID information having a serial number in the upper 8 bytes and a user password in the lower 8 bytes. There is a mechanism for translating only an intermediate code including an identifier that can be derived from the ID information and the contents of the intermediate code. If this identifier is different from the value that can be derived from the ID information and the contents of the intermediate code of the translation processing device 14, and if it is different from the value that can be derived from the common information and the contents of the intermediate code, the translation processing device 14 It is a mechanism to reject. Further, the translation processing device 14 holds common information that all the translation processing devices 14 can understand, and is configured to be able to translate an intermediate code including an identifier that can be derived from the common information and the intermediate code. .

FIG. 3 is a flowchart showing a flow of processing of a provider from a step of receiving a request for content to a step of generating an intermediate code in the second embodiment according to the content providing method of the present invention. . Step S
At 211, the provider receives a content request from a user. In step S213, the provider inputs the content requested by the user in step S211 to the intermediate code generation device 10. Step S2
At 15, the intermediate code generation device 10 generates an intermediate code. If the provider already has the intermediate code to be distributed in advance, there is no need to perform step S215.

FIG. 4 is a flow chart showing a flow of processing of a provider from a step of acquiring ID information to a step of distributing an intermediate code in the second embodiment according to the content providing method of the present invention. In step S217, the provider acquires ID information included in the translation processing device 14 owned by the user via the network.
The translation processing device 14 is assigned unique ID information such as a serial number. If the provider holds the ID information of the translation processing device 14 of the user in advance, there is no need to perform step S217.

In step S218, it is determined whether to generate an intermediate code that can be translated only by the translation processing device 14 of the user or to generate an intermediate code that can be translated by the translation processing device 14 of all users. This determination can be made, for example, by the user or by the provider. Also, always in one or the other,
For example, it can be set so that it is sent only to a specific user. To generate a value that can be calculated only by the translation processing device 14 of a specific user, step S2
At 19, the pseudo-header generation device 20
A pseudo header is generated from the D information. The pseudo header is a collection of information having a relatively short length using the acquired ID information. On the other hand, when generating a value that can be derived by the translation processing devices 14 of all users without limiting the users, in step S221, the pseudo-header generation device generates a common header that all the translation processing devices 14 can understand. Generate a pseudo header from the information. Note that the translation processing device 14 is set with common information that all the translation processing devices 14 can understand. In step S223, step S223
219 or the pseudo header generated in step S221 and the contents of the intermediate code, the identifier calculating device 22 calculates, for example, a checksum, and calculates an identifier used for authentication. In step S225, the provider embeds the identifier derived in step S223 in the intermediate code. In this case, it is preferable to be embedded in the header of the intermediate code. In step S227, the provider delivers the intermediate code in which the identifier is embedded in step S225 to the user via the network.

FIG. 5 is a flowchart showing a flow of a user's process from the step of receiving an intermediate code to the end of the process according to the second embodiment of the content providing method of the present invention. In step S229, the user
Receive the intermediate code input from the provider. In step S231, the pseudo header generating device 20 of the provider generates a pseudo header based on the ID information or the common information of the translation processing device 14 of the user. If the user holds this pseudo header in advance, there is no need to perform step S231. In step S233, the identifier calculating device 22 of the provider performs a calculation such as a checksum from the pseudo header generated in step S231 and the contents of the intermediate code received in step S229, and uses the result for authentication. Calculate the identifier.

In step S235, the identifier comparing means compares the identifier calculated in step S233 with the identifier embedded in the intermediate code distributed from the provider. If the identifiers compared in step S235 match, the intermediate code received in step S229 has been delivered to itself, or has been delivered to all users, and has been generated by the provider. In step S237, the translation processing device 14 performs a translation process to convert the intermediate code into a format such as a machine language that can be used by a user, and the process ends. On the other hand, if the identifiers compared in step S235 do not match, it is determined that the intermediate code received in step S229 is not delivered to itself or is an abnormal intermediate code whose contents have been rewritten for some reason. Then, in step S239, the intermediate code is discarded, and the process ends.

<Third Embodiment> A third embodiment according to the content providing method of the present invention will be described below with reference to the drawings. FIG. 10 is a schematic diagram illustrating a configuration of a device owned by a provider and a user according to the third embodiment of the content providing method of the present invention. The provider has the intermediate code generation device 10, and the user has the translation processing device 14. The provider also has a recording medium 18 on which the content 24 is recorded.

The translation processor 14 has, for example, 16-byte ID information having a serial number in the upper 8 bytes and a user password in the lower 8 bytes. There is a mechanism for translating only an intermediate code including an identifier that can be derived from the ID information and the contents of the intermediate code. If this identifier is different from the value that can be derived from the ID information and the contents of the intermediate code of the translation processing device 14, and if it is different from the value that can be derived from the common information and the contents of the intermediate code, the translation processing device 14 It is a mechanism to reject. Further, the translation processing device 14 holds common information that all the translation processing devices 14 can understand, and is configured to be able to translate an intermediate code including an identifier that can be derived from the common information and the intermediate code. .

FIG. 6 is a flowchart showing the flow of processing of a provider from the step of receiving a request for content to the step of delivering an intermediate code in the third embodiment according to the content providing method of the present invention. . Step S
At 311, the provider receives a content request from a user. In step S313, the provider acquires ID information included in the translation processing device 14 owned by the user via the network. The translation processing device 14 is assigned unique ID information such as a serial number. If the provider holds the ID information of the translation processing device 14 of the user in advance, there is no need to perform step S313.

In step S314, it is determined whether to generate an intermediate code that can be translated only by the user's translation processing device 14, or to generate an intermediate code that can be translated by the translation processing device 14 of all users. This determination can be made, for example, by the user or by the provider. Also, always in one or the other,
For example, it can be set so that it is sent only to a specific user. When an intermediate code that can be translated by the translation processing device 14 of a specific user is generated, in step S315, the content requested by the user in step S311 and the ID information acquired in step S313 are generated. Input to the device 10. In step S317, the intermediate code generation device 10 determines in step S315
Generates an intermediate code that can be translated only by the user's translation processing device 14 from the content and ID information input in step (1).
As an intermediate code generation method in step S317, for example, there is a method of encrypting content using ID information. On the other hand, in a case where an intermediate code that can be translated by the translation processing device 14 of all users is generated without limiting the user, in step S319, the content requested by the user in step S311 and all translations are performed. Information common to the processing device 14 is input to the intermediate code generation device. Note that the translation processing device 14 is set with common information that all the translation processing devices 14 can understand. In step S321, the intermediate code generation device 10 generates an intermediate code that can be translated by the translation processing devices 14 of all users from the content and common information input in step S319. In step S323, step S
317 or the intermediate code generated in step S321 is distributed to the user via the network.

FIG. 7 is a flowchart showing a process flow of a user from the step of receiving an intermediate code to the end of the process according to the third embodiment of the content providing method of the present invention. In step S325, the user
Receive the intermediate code delivered from the provider. In step S327, the user's translation processing device 14 converts the intermediate code received in step S325 into the intermediate code sent to itself based on the ID information or the common information of the user's translation processing device 14. Authenticate whether there is. Specifically, it is determined whether or not the content intermediately coded in steps S317 and S321 can be translated using the ID information or common information of the translation processing device of the user. If it is determined that the translation can be performed using the ID information or the common information of the translation processing device 14 of the user, in step S329, the translation processing device 14 performs a translation process, and the intermediate code uses a machine language or the like. The format is converted to a format usable by the user, and the process ends. On the other hand, if it is determined that the translation cannot be performed by the user's translation processing device 14, the received intermediate code is recognized as being distributed only to a specific user other than the user, and in step S331, the received intermediate code is received. The intermediate code is discarded, and the process ends.

In the first to third embodiments, the intermediate code itself may be further encrypted and distributed in order to further enhance security. In this case, the user who has received the encrypted intermediate code can use the content by first decrypting the encrypted intermediate code and then translating the intermediate code.

[0034]

According to the present invention, the provider distributes a program for decrypting the encrypted content to the user at the same time as the encrypted content, so that the user always holds the decryption program. This eliminates the need to keep the memory of the user's computer small. In addition, anyone other than the user translates the decryption program,
Since the content cannot be used, the content can be safely distributed from the provider to the user.

Further, according to the present invention, the intermediate code input from the provider to the user by some communication means can be used only by the specific user specified by the provider. Even if, for some reason, an intermediate code distributed by a user other than the specific user specified by the provider is obtained, the translation processing device possessed by the user other than the specific user rejects the translation in the authentication process. Cannot be used, so that the intermediate code can be safely input to a specific user.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a flow of processing of a provider from a step of receiving a request for a content to a step of delivering an intermediate code in the first embodiment of the content providing method of the present invention.

FIG. 2 is a flowchart showing a process flow of a user from the step of receiving an intermediate code to the end of the process in the first embodiment according to the content providing method of the present invention.

FIG. 3 is a flowchart showing a flow of processing of a provider from a step of receiving a request for content to a step of generating an intermediate code in the second embodiment according to the content providing method of the present invention.

FIG. 4 is a flowchart showing a flow of processing of a provider from a step of acquiring ID information to a step of distributing an intermediate code in the second embodiment according to the content providing method of the present invention.

FIG. 5 is a flowchart showing a flow of a user's process from a step of receiving an intermediate code to an end of the process in the second embodiment according to the content providing method of the present invention.

FIG. 6 is a flowchart showing a process flow of a provider from a step of receiving a request for content to a step of delivering an intermediate code in the third embodiment according to the content providing method of the present invention.

FIG. 7 is a flowchart showing a process flow of a user from the step of receiving an intermediate code to the end of the process in the third embodiment according to the content providing method of the present invention.

FIG. 8 is a schematic diagram showing a configuration of a device owned by a provider and a user in the first embodiment according to the content providing method of the present invention.

FIG. 9 is a schematic diagram illustrating a configuration of a device owned by a provider and a user according to a second embodiment of the content providing method of the present invention.

FIG. 10 is a schematic diagram showing a configuration of a device provided by a provider and a user according to a third embodiment of the content providing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Intermediate code generation device 12 Encryption device 14 Translation processing device 16 Network 18 Recording medium 20 Pseudo header generation device 22 Identifier calculation device 24 Contents 26 Decryption program

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (3)

[Claims] 1. A translation processing device for each of a user and a provider has ID information so that the translation processing device can be identified, and has common information that all the translation processing devices can understand. A content providing method, wherein the user requests content from the provider, encrypting the content in an encryption device of the provider, and the translation processing device can be identified. Acquiring the ID information previously assigned to the translation processing device from the translation processing device of the user, and generating an intermediate code that can be translated only by the translation processing device of the user; Determining whether to generate an intermediate code that can be translated by the translation processing device of all users;
(A) When generating an intermediate code that can be translated only by the translation processing device of the user, (a-i) input a decryption program for decrypting the encrypted content and the ID information to the intermediate code generation device (A-ii) in the intermediate code generation device, generating an intermediate code from the decryption program and the ID information; and (b) an intermediate code that can be translated by all users' translation processing devices. (B-i) inputting a decryption program for decrypting the encrypted content and the common information to an intermediate code generation device; and (b-ii) the intermediate code generation device. A step of generating an intermediate code from the decryption program and the common information; and one of two steps of generating the intermediate code. Distributing the generated intermediate code and the encrypted content to the user; receiving the intermediate code by the user; and the ID information of the translation processing device of the user or Based on the common information, determining whether the intermediate code was sent to the user,
(C) when it is determined that the intermediate code has been sent to the user, (ci) performing a translation process to convert the intermediate code,
Obtaining the decryption program; (c-ii) decrypting the encrypted content using the decryption program; and (d) determining that the intermediate code has not been sent to the user. (D) discarding the intermediate code and the encrypted content. 2. The translation processing device of each of a user and a provider has ID information so that the translation processing device can be identified, and has common information that can be understood by all the translation processing devices. A content providing method, wherein the user requests content from the provider, inputting the content to an intermediate code generation device, and generating the intermediate code by the intermediate code generation device. Acquiring from the translation processing device of the user the ID information previously assigned to the translation processing device so that the translation processing device can be identified; and translating only by the translation processing device of the user. Determining whether to generate an intermediate code or to generate an intermediate code that can be translated by a translation processing device of all users;
(A) When generating an intermediate code that can be translated only by the translation processing device of the user, (a-i) the pseudo header generation device of the provider uses the ID
(B) generating a pseudo-header from the information; and (b) generating an intermediate code that can be translated by the translation processing devices of all users; (bi) the pseudo-header generation device of the provider provides the common information; From the pseudo header and the intermediate code generated in one of the two steps of generating the intermediate code, the identifier calculation device of the provider calculates an identifier, Embedding the identifier in an intermediate code; distributing the intermediate code in which the identifier is embedded to the user; receiving the intermediate code by the user; and the pseudo-header generation device of the user, Generating a pseudo-header based on the ID information or the common information of the translation processing device of the user; The user's identifier calculating device calculates an identifier from the pseudo header generated by the user's pseudo header generating device and the intermediate code, and an identifier comparing unit determines the identifier embedded in the intermediate code and (C) comparing the identifiers calculated by the user's identifier calculation device with each other; (c) when the compared identifiers match, (ci) performing a translation process to convert the intermediate code; If the compared identifiers do not match, (d-i) discarding the intermediate code. 3. The translation processing device of each of the user and the provider has ID information so that the translation processing device can be identified, and has common information that can be understood by all the translation processing devices. The content providing method, wherein the user requests content from the provider, and the ID information previously assigned to the translation processing device so that the translation processing device can be identified. Acquiring from a user's translation processing device; and determining whether to generate an intermediate code that can be translated only by the user's translation processing device or to generate an intermediate code that can be translated by all user's translation processing devices. (A) when generating an intermediate code that can be translated by a translation processing device of a specific user; (A) inputting the intermediate code from the content and the ID information to the intermediate code generating device;
(B) when generating an intermediate code that can be translated by the translation processing devices of all users; (bi) inputting the content and the common information to an intermediate code generating device; (b-ii) An intermediate code generation device that generates an intermediate code from the content and the common information; and the intermediate code and the encrypted content generated in one of the two steps of generating the intermediate code. Delivering to the user, the step of receiving the intermediate code by the user, and the step of receiving the intermediate code based on the ID information or the common information of the translation processing device of the user. Determining whether the message was sent to the user;
(C) when it is determined that the intermediate code has been sent to the user, (c-i) performing a translation process to convert the intermediate code; (D) discarding the intermediate code if it is determined that the intermediate code has not been sent to the user.