JP2004127164A - Lending management system of content - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lending management system of contents for which no return procedure of the contents is required and in which browsing of the contents after a lending period is prevented. <P>SOLUTION: The lending management system of contents is provided with a lending store 20 which lends a recording medium 21 in which the encrypted contents and validity of the contents are stored and a player 10 having a control part 2, a radio controlled clock 4, and a storage part 6 which stores an encryption key and the control part 2 decodes the contents by a decoding key, and reproduces them when time of the wave clock is decided to be within the validity read from the recording medium. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a content lending management system in a rental video shop or the like.
[0002]
[Prior art]
Normally, when renting video software at a rental video shop, the user needs to go to the shop after browsing the software and return the software. For this reason, a technology for transmitting and receiving software (data) between a user terminal and a rental server via a network has been disclosed (for example, see Patent Document 1). In this technology, it is assumed that the software is returned by performing return upload from the user terminal to the rental server after browsing the software. After the return process, it is also possible to perform a software deletion process on the user terminal side.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-42234 (FIG. 14, Claim 21)
[0004]
[Problems to be solved by the invention]
However, in the case of the above-described technology, although the user does not need to go to the store, there is a problem that the user still has to perform a procedure for return on the terminal. If the terminal is set so as not to delete the software of the user terminal, the software can be re-viewed even after the return processing.
[0005]
The present invention has been made in view of the above-described problems, and has as its object to provide a content lending management system that does not require a content return procedure and that prevents content browsing after a lending period.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a content lending management system according to claim 1 includes a lending store that lends a recording medium storing encrypted content and an expiration date of the content, a control unit, a reference clock, A playback device having a storage unit for storing the encryption key, wherein the control unit determines that the time of the reference clock is within the expiration date read from the recording medium, The content is decrypted and reproduced.
In this way, the reference clock that cannot be falsified from the outside and the expiration date of the content are compared, and the expired content is automatically disabled from being played back. There is no need for the user to perform the content return procedure.
[0007]
A content lending management system according to claim 2, wherein a rental store that lends a recording medium storing the encrypted content and the expiration date of the content, a storage unit of a portable terminal storing a processing program, and a control unit A reproducing device having an input unit and a storage unit for storing the encryption key, wherein the processing program generates a numeral string by a predetermined function using a time of a clock unit built in the portable terminal as an input value; Wherein the control unit extracts the time from the number string input via the input means by an inverse function of the function, and determines that the time is within the expiration date read from the recording medium. In this case, the content is decrypted with the encryption key and reproduced.
By doing so, the time of the timekeeping means of the portable terminal which cannot be falsified from the outside is compared with the expiration date of the content, and the expired content is automatically made unreproducible, thereby preventing illegal content reproduction after the expiration. In addition, there is no need for the user to perform the content return procedure after the expiration. Further, since the current time is obtained from the clock means built in the portable terminal, there is no need to incorporate a reference clock in the playback device. Furthermore, since the current time is replaced with a numeric string by a predetermined function, it is impossible to falsify the numeric string to delay the time unless the user knows the function.
[0008]
4. The content lending management system according to claim 3, further comprising an encryption key generation unit configured to generate an encryption key, and a rental store that lends a recording medium storing the content encrypted with the encryption key and the expiration date of the content. And a storage device of a portable terminal storing a processing program, and a playback device having a control unit and an input unit, wherein the encryption key generation unit has a predetermined value in which terminal unique information of the portable terminal is at least an input value. The encryption key is generated by a function, and the processing program generates the encryption key by the predetermined function using at least the terminal-specific information as an input value, and executes the encryption key and a timer of a timer built in the portable terminal. The control unit generates a number sequence by another function using a time as an input value, and the control unit performs an inverse function of the another function when the number sequence is input through the input unit. More taken out the time and the encryption key, when said time is determined to be within the validity period read from said recording medium, characterized by reproducing by decoding the content in the encryption key.
By doing so, the time of the timekeeping means of the portable terminal which cannot be falsified from the outside is compared with the expiration date of the content, and the expired content is automatically made unreproducible, thereby preventing illegal content reproduction after the expiration. In addition, there is no need for the user to perform the content return procedure after the expiration. Further, since the current time is obtained from the clock means built in the portable terminal, there is no need to incorporate a reference clock in the playback device. Furthermore, since the current time is replaced with a numeric string by a predetermined function, it is impossible to falsify the numeric string to delay the time unless the user knows the function.
In addition to these, the rental store dynamically generates the content encryption key based on the terminal-specific information and stores it in the user's portable terminal. input. Since the numeral string includes the encryption key, there is no need to prepare the encryption key in the reproducing apparatus in advance.
[0009]
A content lending management system according to a fourth aspect is characterized in that the lending store is an electronic store connected to a network.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a content lending management system according to the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a content lending management system according to the first embodiment of the present invention.
[0011]
In this figure, the content lending management system includes a player (player) 10 and a lending store 20. The lending store 20 encrypts the content requested by the user with a predetermined encryption key, and stores the content in a recording medium (for example, a CD-R or the like) together with information on the expiration date (lending date) of the content and the encryption key used for the encryption. Store and perform the lending procedure.
[0012]
The player 10 includes a recording medium insertion slot and a reading unit (not shown), a control unit 2 such as a CPU, and a reference clock (for example, a radio clock) that prohibits time tampering from the outside of the user and allows autonomous accurate time adjustment. ) 4 and a storage unit 6 for storing a plurality of encryption key groups negotiated with the rental store 20. The player 10 is a video player, a music player, or the like that reproduces content read from a storage medium. The encryption key is, for example, a random number, and the encryption key and the decryption key are the same.
[0013]
Next, a content reproducing method will be described. First, the user borrows the recording medium 21 storing the content at the rental store 20, and inserts the recording medium 21 into the player 10 at home.
[0014]
The control unit 2 of the player 10 reads the expiration date of the recording medium 21 via the reading unit, and acquires the current time from the radio clock 4. Here, the “expiration date” indicates a date when reproduction of the content is permitted, and corresponds to a lending period. Next, the control unit 2 determines whether or not the current time is within the expiration date, and performs a reproduction process if the current time is within the expiration date. That is, the control unit 2 reads the encryption key information of the recording medium 21, acquires the corresponding encryption key from the storage unit 6, and reproduces the content by decrypting the content with the encryption key. On the other hand, if the current time is outside the expiration date, the control unit 2 does not perform the reproduction process.
[0015]
In this way, the reference clock that cannot be altered from the outside and the expiration date of the content are compared, and the expired content is automatically disabled from being played back. There is no need for the user to perform the return procedure.
[0016]
Next, a configuration of a content lending management system according to a second embodiment of the present invention will be described with reference to FIG.
In this figure, the content lending management system includes a playback device (player) 10A, a lending store 20, and storage means 33 of a user's mobile terminal (mobile phone). The configuration of the rented store 20 is the same as that of the first embodiment, and the description is omitted.
[0017]
The player 10A, like the player 10, includes a recording medium insertion slot and a reading unit (not shown), a control unit 2 such as a CPU, an input unit 3, a processing program storage unit 5, and a storage unit 6. Since the configurations of the control unit 2 and the storage unit 6 are the same as those of the player 10, description thereof is omitted. The player 10A is different from the player 10 in that the player 10A does not have a reference clock, but instead obtains the current time by a method described later by a processing program stored in the storage unit 5.
[0018]
The mobile phone 30 includes a display unit 31 such as a liquid crystal screen, a control unit 32 such as a CPU, a storage unit 33, and a clock unit (internal clock) 34. The storage unit 33 stores a predetermined processing program. The internal clock 34 is prohibited from being tampered with from outside the user.
[0019]
Next, a content reproducing method will be described. First, the user who has rented the recording medium 21 storing the content at the rental store 20 inserts the recording medium 21 into the player 10A.
[0020]
The control unit 2 of the player 10A reads the expiration date of the recording medium 21 via the reading unit, and prompts the user to input a one-time putt on a display screen (not shown), for example. This one-time pad is obtained by replacing the current time indicated by the internal clock 34 in the mobile phone with a number string that cannot be recognized by the user, and by inputting this number string to the player 10A, It functions as a substitute for a clock.
[0021]
The user operates the mobile phone 30 as appropriate to generate a one-time putt. Thereby, the control means 32 of the mobile phone 30 activates the processing program of the storage means 33 to perform the one-time pad generation processing. In this process, as shown in the flow of FIG. 3, the present time (date information) obtained from the internal clock 34 is multiplied by a predetermined function (random number table) F0 and replaced with a one-time pad (numerical string) ( FIG. 3A). The control means 32 displays the generated one-time putt on the display means 31, and the user inputs the value to the player 10A via the input means 3.
[0022]
On the other hand, when the one-time put is input, the control unit 2 of the player 10A activates a processing program of the storage unit 5 and performs a one-time put decoding process. In this process, as shown in the flow of FIG. 3, the one-time pad is multiplied by a function -F0 (an inverse function of the above-mentioned F0) to extract the original date information (FIG. 3B).
[0023]
Next, the control unit 2 determines whether or not the date information (current time) is within the expiration date from the extracted date information and the expiration date read from the recording medium 21. Perform playback processing. That is, the control unit 2 reads the encryption key information of the recording medium 21, acquires the corresponding encryption key from the storage unit 6, and reproduces the content by decrypting the content with the encryption key. On the other hand, if the current time is outside the expiration date, the control unit 2 does not perform the reproduction process.
[0024]
In this way, the internal clock of the mobile phone, which cannot be altered from the outside, is compared with the expiration date of the content, and the expired content is automatically disabled from being played back. There is no need for the user to perform a later content return procedure. Further, since the current time is obtained from the internal clock of the mobile phone, it is not necessary for the player to incorporate a reference clock. Furthermore, since the current time is replaced with a one-time pad (numerical string) by a predetermined function, it is impossible to falsify the numeric string to delay the time unless the user knows the function.
[0025]
Next, a configuration of a content lending management system according to a third embodiment of the present invention will be described with reference to FIG.
In this figure, the content lending management system includes a playback device (player) 10B, a lending store 20A, and a storage unit 33A of a user's mobile terminal (mobile phone). In this embodiment, the lending store 20A dynamically generates an encryption key for encrypting the content and stores it in the mobile phone of the user, and the user operates the mobile phone to generate a one-time pad. Since the one-time pad includes the encryption key, there is a feature that the player does not need to prepare an encryption key in advance.
[0026]
The lending store 20A has a computer (encryption key generation unit) 22, which will be described later, encrypts the contents requested by the user with the encryption key, and uses the expiration date (lending expiration date) of the content and the content ID (assigned for each content). Stored in the recording medium 21A along with the lending procedure.
[0027]
The player 10B includes, similarly to the player 10A, an insertion port and a reading unit for a recording medium (not shown), a control unit 2 such as a CPU, an input unit 3, a processing program storage unit 5B, and a storage unit 7 for storing a service key. And The service key is unique information determined for each type of player. The player 10B differs from the player 10A in that no encryption key is stored.
[0028]
The mobile phone 30A includes a display unit 31 such as a liquid crystal screen, a control unit 32 such as a CPU, a storage unit 33A, a clock unit (internal clock) 34, a terminal ID storage unit 35, a secret storage area 36 for storing a license ID and a content ID. Is provided. The storage unit 33A stores a predetermined processing program. The internal clock 34 is prohibited from being tampered with from outside the user.
[0029]
Next, a method for generating an encryption key will be described. First, at the time of the lending procedure, the user connects the mobile phone 30A to the computer 22 of the lending store 20A and transmits the terminal ID (terminal specific information) of the terminal ID storage unit 35. The computer (encryption key generation unit) 22 performs an encryption key generation process. In this process, as shown in the flow of FIG. 5A, a terminal ID acquired from the mobile phone 30A, a license ID issued at the time of lending, and an application key described later are used as input values of a first function (random number). Table) F1 is used to obtain a number string, and this number string and the service key are used as input values to generate an encryption key using a second function (random number table) F2. Since this numeric string contains information on the encryption key, it is hereinafter referred to as “key information”.
[0030]
Here, the license ID is authentication information uniquely assigned to each rental, and the application key is information concealed in a processing program (application) for one-time pad generation executed on the mobile phone 30A. Is downloaded from the computer 22 to the mobile phone 30A together with the processing program. The service key corresponds to the type of content requested by the user for lending, and is automatically input by the computer 22. For example, if the content is video software, the corresponding player is a video player, and the service key is accordingly.
[0031]
Next, the computer 22 transmits the license ID, the content ID, and the processing program (application) to the mobile phone 30A, and the control unit 32 of the mobile phone 30A stores each ID in the secret storage area 36, and executes the processing program. Is stored in the storage means 33A. Then, the user returns with the mobile phone 30A and the recording medium 21A, and reproduces the data with the player 10B at home.
[0032]
Next, a content reproducing method will be described. First, the user inserts the recording medium 21A into the player 10B.
The control unit 2 of the player 10B reads the expiration date and the content ID of the recording medium 21 via the reading unit, and prompts the user to input a one-time pad on a display screen (not shown), for example. This one-time pad is obtained by replacing the current time and the encryption key indicated by the internal clock 34 in the mobile phone with a number string that cannot be recognized and falsified by the user. By inputting this number string to the player 10B, It functions as a substitute for the reference clock and the encryption key in one embodiment.
[0033]
The user appropriately operates the mobile phone 30A to generate a one-time putt. Thereby, the control means 32 of the mobile phone 30A activates the processing program of the storage means 33A to perform the one-time pad generation processing. In this process, as shown in the flow of FIG. 5B, first, the license ID is obtained from the secret storage area 36, the terminal ID is obtained from the terminal ID storage unit 35, and the application key in the processing program is changed. get. Then, key information is obtained by using a first function (random number table) F1 using these as input values. Next, a one-time pad (numerical string) is obtained by a third function (random number table) F3 using the current time (date information) acquired from the internal clock 34 and the key information as input values. The control means 32 displays the generated one-time pad (numerical string) on the display means 31 and the user inputs the value to the player 10A via the input means 3. In this embodiment, in addition to the date information and the key information, the function F3 is multiplied by using the content ID acquired from the secret storage area 36 and a predetermined random number as input values.
[0034]
On the other hand, when the one-time put is input, the control unit 2 of the player 10A activates a processing program of the storage unit 5B to perform a one-time put decoding process. In this process, as shown in the flow of FIG. 5C, the original date information (current time) and key information are obtained by multiplying the one-time pad and the content ID by a function -F3 (an inverse function of the above F3). Take out.
[0035]
Next, the control unit 2 determines whether or not the date information (current time) is within the expiration date from the extracted date information and the expiration date read from the recording medium 21. Generate an encryption key (decryption key) for reproduction. That is, in the flow of FIG. 5C, the control unit 2 generates an encryption key by the second function F2 using the obtained key information and the service key obtained from the storage unit 7 as input values, and generates the encryption key. Reproduction is performed by decrypting the content with the key. On the other hand, if the current time is outside the expiration date, the control unit 2 does not perform the reproduction process.
[0036]
In this way, the internal clock of the mobile phone, which cannot be altered from the outside, is compared with the expiration date of the content, and the expired content is automatically disabled from being played back. There is no need for the user to perform a later content return procedure. Further, since the current time is obtained from the internal clock of the mobile phone, it is not necessary for the player to incorporate a reference clock. Furthermore, since the content encryption key is replaced with the one-time pad (numerical string) of the current time using a predetermined function based on the terminal ID, unless the user knows the function, the numeric string is tampered to delay the time. Is also impossible.
[0037]
In addition to this, in this embodiment, the rental store dynamically generates a content encryption key based on the terminal ID and stores it in the user's mobile phone, and the user operates the mobile phone to generate a one-time pad. Let it. Since the one-time pad includes the encryption key, it is not necessary for the player to prepare the encryption key in advance.
[0038]
In the third embodiment, a terminal ID (unique information) is indispensable as an input value when generating key information using the function F1, but other information may be omitted. Further, key information is indispensable as an input value when an encryption key is generated using the function F2, but a service key may not be provided. Further, key information and current time are indispensable as input values when a one-time pad is generated using the function F3, but other information may not be provided. However, when the input values include these pieces of information, the generated numeric string is less likely to be decrypted by an unauthorized user, which is preferable for safety.
[0039]
Further, in the third embodiment, the processing by the function F2 may be omitted. In this case, the key information is used as it is as the encryption key.
[0040]
In each of the above embodiments, the rental store may be an electronic store (a server on a network or the like). In this case, the user inputs a content lending request from a terminal connected to the network, and the electronic store sends the encrypted content to the user terminal via the network. The user stores the received content data in a predetermined recording medium and reproduces the content data on the player. In the case of the third embodiment, the user connects the mobile phone to the electronic store via the network, and transmits a terminal ID and receives a license ID, a content ID, a processing program, and content data. The received content data is stored in a predetermined recording medium and reproduced by the player.
[0041]
The content lending management system of the present invention can be realized by a computer, various peripheral devices such as a communication device, and a software program executed by the computer. The software program executed in the system is It can be distributed via a computer-readable storage medium or a communication line.
[0042]
【The invention's effect】
As described above, according to the present invention, the reference clock of a playback device, which cannot be falsified from the outside, or the time of a timer of a portable terminal is compared with the expiration date of the content, and the expired content is automatically reproduced. Since it becomes impossible, illegal content reproduction after the expiration is prevented, and it is not necessary for the user to perform the content return procedure after the expiration.
[Brief description of the drawings]
FIG. 1 is a diagram showing the configuration blocks of a content lending management system according to a first embodiment of the present invention.
FIG. 2 is a diagram showing configuration blocks of a content lending management system according to a second embodiment of the present invention.
FIGS. 3A and 3B show a processing flow in a second embodiment of the present invention, in which FIG. 3A shows a one-time pad generation processing flow, and FIG. 3B shows a one-time pad decoding processing flow. .
FIG. 4 is a diagram showing a configuration block of a content lending management system according to a third embodiment of the present invention.
FIGS. 5A and 5B show a processing flow in a third embodiment of the present invention, in which FIG. 5A shows an encryption key generation processing flow, and FIG. 5B shows a one-time pad generation processing flow. (C) is a diagram showing a one-time pad decryption processing flow.
[Explanation of symbols]
2 Control unit 3 Input means 4 Reference clock (radio clock)
5, 5B (Stores processing program) Storage unit 6 (Stores encryption key) Storage unit 10 Reproducer 20, 20A Lending store 21, 21A Recording medium 33, 33A Storage unit 34 of portable terminal Clocking unit (internal clock)
35 Terminal specific information (terminal ID)

Claims (4)

A lending store that lends a recording medium storing the encrypted content and the expiration date of the content,
A content lending management system including a playback device having a control unit, a reference clock, and a storage unit for storing an encryption key,
When the control unit determines that the time of the reference clock is within the expiration date read from the recording medium, the control unit decrypts the content using the encryption key and reproduces the content. . A lending store that lends a recording medium storing the encrypted content and the expiration date of the content,
Storage means of the mobile terminal storing the processing program,
A content lending management system comprising a playback unit having a control unit, an input unit, and a storage unit for storing an encryption key,
The processing program is to generate a number string by a predetermined function using the time of the clock means built in the portable terminal as an input value,
The control unit retrieves the time from the numeric string input through the input unit by an inverse function of the function, and when determining that the time is within the expiration date read from the recording medium, A content lending management system, wherein the content is decrypted with an encryption key and reproduced. A lending store having an encryption key generation unit for generating an encryption key, and lending a recording medium storing the content encrypted by the encryption key and the expiration date of the content,
Storage means of the mobile terminal storing the processing program,
A content lending management system including a playback device having a control unit and an input unit,
The encryption key generation unit generates the encryption key by a predetermined function using at least the terminal-specific information of the mobile terminal as an input value,
The processing program generates the encryption key by the predetermined function using the terminal-specific information as at least an input value, and another function using the encryption key and the time of a clock unit built in the mobile terminal as an input value. To generate a numeric string by
The control unit, when the number string is input via the input unit, extracts the time and the encryption key by an inverse function of the another function, and the time is within the expiration date read from the recording medium. A content lending management system for decrypting the content with the encryption key and reproducing the content. 4. The content lending management system according to claim 1, wherein the lending store is an electronic store connected to a network.

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