JP2003345662A - Contents data reproducing device, contents data distributing server, contents data management system, and contents data reproducing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent contents data from being illegally copied and used on a user's contents data reproducing device and to prevent the contents data from being used by an illegal operation of a built-in clock part of a user's terminal in the case of the illegal use. <P>SOLUTION: A managing device for contents data has the built-in clock part whose time is adjustable; when the contents data are reproduced, device time information is obtained from the built-in clock part and held in a device time information holding part while related to the contents data and file time information related to the reproduced contents data is updated. When the contents data are reproduced, the file time information and device time information are obtained and the contents data reproducing which reproduces the contents data is used by the permission of the reproduction based upon the result of a comparison between 1st time indicated with the file time information and 2nd time indicated with the device time information. <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 an apparatus, a server, a system, and a program for reproducing content data recorded and downloaded to a terminal through a communication network.

[0002]

2. Description of the Related Art A CD, which is a medium for transmitting content data such as music, video, electronic books, and computer programs,
In parallel with sales and rentals via electronic recording media such as DVDs and MDs, sales and rentals by downloading such information online or temporary by streaming are now performed using the Internet and cable television broadcasting networks. Methods such as utilization are spreading.

[0003] In particular, when selling or renting content data online, since the data itself is transmitted to the user's terminal, unauthorized use such as unauthorized copying beyond the range permitted by the data provider is performed. Is likely to take place. In addition, sales and recording media such as DVD
Even in the case of rental, due to the development of a reproducing apparatus for such a recording medium, there is a possibility that the contents data recorded on the recording medium is illegally copied without deteriorating the image quality or the like.

Conventionally, in order to prevent such illegal use of digital contents, data relating to the use of the data (reproducible period and number of reproducible times) is written in the content data and can be reproduced by a dedicated reproducing program. There was technology to do. For example, the information of the usable period is written in the content data, and when it is determined that the date and time specified by the built-in clock unit of the terminal using the data is not in the usable period, the dedicated reproduction program reproduces the content. In this case, unauthorized use of digital contents has been prevented by disabling or erasing the digital contents.

[0005]

However, when the content data is downloaded, a plurality of the content data are copied to the downloaded terminal, and after one content data is deleted, the content data is copied. Unauthorized use, in which other content data is reproduced and used by a sequential reproduction program, cannot be prevented. Further, in reproducing the copied content data, it has not been possible to prevent unauthorized operation of the built-in clock section of the user's terminal.

[0006] In view of the above problems, the present invention has been developed in such a manner that content data is illegally copied and used by a user's content data reproducing apparatus, and that an illegal operation of a built-in clock section of a user terminal is performed in the event of such unauthorized use. To prevent content data from being used by the user.

[0007]

According to another aspect of the present invention, there is provided a content data management device having a built-in clock unit capable of adjusting time, wherein the built-in clock unit is used when content data is reproduced. The device time information is obtained from the device data and stored in the device time information holding unit in association with the content data, and the file time information associated with the reproduced content data is updated. When the content data is reproduced, the file time information and the device time information are obtained, and a first time indicated by the file time information is compared with a second time indicated by the device time information. The content data reproducing device, the content data distribution server, the content data management system, and the content data reproducing program for reproducing the content data associated with the file time information are used by permitting the reproduction based on the result.

[0008]

1 to 16 show an embodiment of the present invention.
This will be described with reference to FIG.

FIG. 1 is a diagram showing the concept of an embodiment of the present invention.

(Embodiment 1)

(Concept of Embodiment 1)

[0013] The customer A downloads the content data X including the information on the viewing period from the server to his or her personal computer via the Internet. The information on the viewing period of the content data X is updated by time data based on the internal clock of the personal computer at the time of playback, and cannot be played after the viewing period has elapsed.
Therefore, the user A who intends to use the content illegally copied the content data X to the hard disk of the personal computer (content data Y) before playing the content data on the personal computer.

[0013] The customer A reproduces the content data X downloaded first, and cannot reproduce the content data X from the day when the viewing period has elapsed.

[0014] Therefore, the customer A attempts to reproduce the copied content data Y after the viewing period has elapsed. At this time, since the internal clock of the personal computer of the customer A indicates the date and time beyond the viewing period, the user A who thought that the content data Y cannot be reproduced as it is, operates the personal computer and sets the internal clock. The indicated time was changed to a viewable date and time.

However, when the personal computer of the user A reproduces the content data Y, the personal computer of the customer A
Detects that the content is an illegal copy,
Did not play Y.

The invention of this embodiment provides a mechanism for preventing the illegally copied content data from being reproduced as described above.

(Structure of Embodiment 1)

FIG. 2 is a diagram showing an example of the functional blocks of the present embodiment. The configuration of the present embodiment will be described with reference to FIG.

In this embodiment, a built-in clock unit 201, a file holding unit 202, an acquiring unit 203, a reproducing unit 204, a device time information holding unit 205, a device time information writing unit 206, a file time information updating unit 207, a file time Information acquisition unit 2
08, a device time information acquisition unit 209, a permission unit 210, and a reception unit 211.

The "built-in clock 201" manages the time in the content data reproducing apparatus, and can adjust the time by an external operation. In other words, the built-in clock unit is configured so that a time other than the actual time can be intentionally set to the time indicated by the internal clock unit, for example, for an unauthorized purpose. In addition, the built-in clock unit may be able to manage the time even when the operation system of the content data reproducing apparatus is not activated as long as the content data reproducing apparatus is supplied with electricity.

[0021] The "receiving unit 211" receives the content data from the content distribution server 212 via the communication network. The communication network includes Internet communication, cable line communication, satellite communication, and the like. Further, the receiving unit 211 may be configured to pass the received content data to the file holding unit 202 described below, or may be configured to pass the received content data to the acquiring unit 203 described below. (311 and 3 in FIG. 3)
03).

The "file holding unit 202" holds content data in a file in association with file time information which is information indicating time. "Content data" refers to information such as digitized music, video, characters, and computer programs. “File time information” refers to information indicating time, and may be, for example, time information of the internal clock unit when content data is held in the file holding unit. “Holding in a file” refers to a state in which content data is managed in association with at least file time information.

The file holding unit 202 includes the receiving unit 211
And holds the received content data in a file in association with file time information, which is information indicating time. Although not shown, the content management apparatus may hold content data read from an electronic recording medium such as a DVD into the content management apparatus. In addition, content data is not only stored as one set of data,
The data may be held as data divided and distributed based on rules. Further, such “split / dispersion” is non-continuous, and each of the split / split data is inversely transformed based on rules, decoded, and reproduced. The data may be stored in a file together with information for reproducing the data as continuous data.

The "acquisition unit 203" acquires content data for reproduction. The content data is obtained from the file holding unit. Alternatively, the content data received by the receiving unit may be obtained (see 311 and 303 in FIG. 3).

The "reproducing unit 204" reproduces the content data acquired by the acquiring unit 203. The acquisition unit 20
3 directly receives the content data from the receiving unit 211 (see 311 and 303 in FIG. 3), the content data can be reproduced by so-called streaming. In addition, the acquisition unit 203 stores the file holding unit 202
If the content data can be obtained from both of the receiving unit 212 and the content data can be obtained by streaming, as shown in FIG. 4, if the content data is desired, the content data can be downloaded later. Becomes

The "device time information holding unit 205" holds playback time information, which is the time at which the playback was performed by the playback unit 204, as device time information in association with the content data.

The "time at which the reproduction was performed" includes the time at which the reproduction was started by the reproduction unit, the time at any point during the reproduction, and the time at which the reproduction was terminated.

The "device time information writing unit 206" acquires reproduction time information as device time information from the built-in clock unit when the reproduction is performed by the reproduction unit 204, and stores it in the device time information holding unit. Writing is performed in association with the content data.

The "when the reproduction is performed" means the time when the reproduction is started by the reproduction unit, the time at any point during the reproduction, and the reproduction is completed in the same manner as the "time when the reproduction is performed". Includes time of day.

The "file time information updating unit 207" acquires time information from the built-in clock unit as file time information when reproduction is performed by the reproduction unit, and obtains a file time associated with the content data. Update information.

The "file time information obtaining unit 208" obtains file time information associated with the content data obtained by the obtaining unit from the file containing the content data. When the content data received by the receiving unit is directly acquired by the acquiring unit, there is a case where the file time information associated with the content data does not exist, so that the file time information may not be acquired.

The "device time information acquisition unit 209" acquires device time information associated with the content data acquired by the acquisition unit from the device time information holding unit.

The "permission unit 210" determines a first time indicated by the file time information acquired by the file time information acquisition unit and a second time indicated by the device time information acquired by the device time information acquisition unit. The comparison is performed, and the reproduction of the content data is permitted based on the comparison result. “Allow reproduction of content data based on the comparison result” means that reproduction is permitted when the first time data and the second time data are the same time, and that the first time is newer than the second time. In some cases, this may include allowing playback. Further, "when the time is the same" includes a case where the time can be regarded as the same, in addition to a case where the time coincides. The “time that can be regarded as the same” refers to a time within a predetermined time, and the predetermined time is a time generated based on an illegal copy, such as “10 seconds” or “1 minute”. If it is not possible, the length of time does not matter. Also, as described above, when the content data received by the receiving unit is directly acquired by the acquiring unit, there is a case where the file time information associated with the content data does not exist. The reproduction of the content data may be permitted. This is because the content data received by the receiving unit is not illegally copied by the content data reproducing device, and therefore, the object of the present invention can be achieved even if the reproduction of the content data is permitted in such a case.

As described above, the configuration of this embodiment is the built-in clock section 201, the file holding section 202, the obtaining section 203, the reproducing section 204, the apparatus time information holding section 205, the apparatus time information writing section 206, the file time information updating section. Unit 207, file time information acquisition unit 208, device time information acquisition unit 209,
Although the content data reproducing apparatus includes the permission unit 210 and the receiving unit 211, the content data reproducing apparatus may not include the receiving unit 211.

In this embodiment, the built-in clock section 201,
File holding unit 202, acquisition unit 203, playback unit 204,
Device time information holding unit 205, file time information acquisition unit 2
08, a device time information acquisition unit 209, a permission unit 210, and a built-in clock unit 201, a file holding unit 202, an acquisition unit 203, a reproduction unit 204, a device time information holding unit 205, and a device time information write. A unit 206 and a file time information updating unit 207 may be used.

Further, the content data reproducing device 20
0 may constitute a content data distribution system configured with the content distribution server 212.

(Specific Flow of First Embodiment)

The specific flow of this embodiment will be described with reference to FIG.

The customer A receives the content data X for which the viewing period is set via the Internet from the content data distribution server to the receiving section of the content data reproducing apparatus, and reproduces the content data X by the reproducing section. . The time information of the internal clock section at the time of reproducing the content data X is obtained as the file time information B, and the file time information associated with the content data X is updated to the file time information B. After the reproduction, the user A illegally copied the file containing the content data X to the hard disk of the content data reproducing apparatus (the file containing the content data Y).

By the last viewing of the content data X before the viewable period has elapsed, the file time information B associated with the content data X is updated to the file time information C indicating the time of the last viewable time limit. , And can no longer be viewed. As an example of a technique for setting a period during which the content can be viewed and restricting the reproduction of the content data, a technique described in Japanese Patent Application No. 2001-316237 is exemplified.

After that, the customer A moves the file containing the content data Y to the file holding unit in order to reproduce the illegally copied content data Y, and the time of the built-in clock unit can be viewed by the content data Y. Illegal operation at the time.

The acquiring unit has acquired the content data Y from the file holding unit. The file time information obtaining unit has obtained the file time information B associated with the content data Y. In addition, the device time information acquisition unit has acquired device time information associated with the content data Y. Such content data Y is a copy of content data X,
Since the content data has the same content, the device time information acquisition unit has acquired the device time information C associated with the content data X. The permission unit has a first time indicated by the file time information B obtained by the file time information,
The second time indicated by the device time information C obtained by the device time information obtaining unit was compared, and the reproduction was not permitted because the comparison result was not the same.

(Processing Flow of First Embodiment)

FIG. 6 is a flowchart showing an example of the processing flow of the present embodiment. The flow of the process according to the present embodiment will be described with reference to FIG. However, one example of this “processing” is
The procedure can be implemented as a method, a computer-executable program, and a recording medium on which the program is recorded. Further, such a program may be distributed from the content distribution server 212 through a communication network.

FIG. 6A is a flowchart showing an example of a flow until the content data is reproduced.

In a content data reproducing apparatus having a built-in clock section capable of adjusting time and having a file holding section for holding content data in association with file time information indicating time, first, content data is reproduced. (Content data acquisition step S
0601a). Next, file time information associated with the obtained content data is obtained (file time information obtaining step S0602a). Further, device time information associated with the obtained content data is obtained (device time information obtaining step S0603).
a). Further, the first time indicated by the acquired file time information is compared with the second time indicated by the acquired device time information, and based on the comparison result (specifically,
For example, the reproduction of the content data is permitted (based on whether the first time and the second time are the same) (permission step S06).
04a). Finally, the content data is reproduced based on the permission of the reproduction in the step (reproduction step S060).
5a).

FIG. 6B is a flowchart showing an example of the processing flow until the device time information is held and the file time information is updated.

In a content data reproducing apparatus having a built-in clock section capable of adjusting time and having a file holding section for holding content data in association with file time information which is information indicating time, first, based on permission for reproduction, The content data is reproduced (content data reproduction step S0601b). Next, when the content data is reproduced, the reproduction time information is obtained as the device time information from the built-in clock section, and held in association with the content data (device time information holding step S0602).
b). Further, when the content data is reproduced, the reproduction time information is obtained as the file time information from the built-in clock section, and the file time information associated with the content data is updated (the file time information updating step). S0603b).

(Brief Description of Effect of First Embodiment)

By using the content data reproducing apparatus of the present embodiment, for example, when content data is copied to a hard disk on the apparatus and reproduction is attempted, it is possible to restrict reproduction of the copied content data. it can. In other words, the first time indicated by the file time information written to the file in which the content data is stored and the second time indicated by the device time information written in association with the content data in the device time information should originally indicate the same time It is. However, when this is different (when the first time is older than the second time), it is highly possible that the content data associated with the file time information indicating the first time is a duplicated content data. The above-mentioned effect can be obtained by restricting the reproduction of.

(Embodiment 2)

Next, a second embodiment will be described.

(Concept of Embodiment 2)

The present embodiment has basically the same configuration as the first embodiment, but when the permission unit does not permit the reproduction,
It is characterized by initializing content data.

FIG. 7 is a diagram showing the concept of this embodiment.
The concept of the present embodiment will be described with reference to FIG.

User A downloads content data X including information on the viewing period to the content data reproducing apparatus via the Internet. The customer A tried to copy the content data X (content data Y) and use it illegally. The information on the viewing period is updated at the time of reproduction by using the technology described in Japanese Patent Application No. 2001-316237, as described above, so that if the reproduction is performed until the end of the viewing period, the information cannot be viewed thereafter.

After the viewing period of the content data X has elapsed, the user A illegally changes the built-in clock section of the playback device to a date and time at which the content data Y can be viewed, and the information on the viewing period has not been updated. An attempt was made to play back the illegally duplicated content data Y, but the playback device detected this as illegal and initialized the content data Y.

The invention of this embodiment provides a mechanism in which the above illegally copied content data cannot be initialized and used.

(Structure of Embodiment 2)

FIG. 8 is a diagram showing an example of the functional blocks of this embodiment.

The configuration of the present embodiment will be described with reference to FIG.

In this embodiment, a built-in clock unit 801, a file holding unit 802, an obtaining unit 803, a reproducing unit 804, a device time information holding unit 805, a device time information writing unit 806, a file time information updating unit 807, a file time Information acquisition unit 8
08, a device time information acquisition unit 809, a permission unit 810, an initialization unit 811, and a reception unit 812.

Internal clock section 801, file holding section 80
2. Acquisition unit 803, playback unit 804, device time information holding unit 805, device time information writing unit 806, file time information update unit 807, file time information acquisition unit 808, device time information acquisition unit 809, permission unit 810 , Receiving unit 812
Is the same as the corresponding part of the first embodiment, and the description is omitted.

The "initializing unit 811" initializes the content data associated with the file time information when the permission unit does not permit the reproduction of the content data.

As an "initialization" method, it is conceivable to replace the entire digital information of the content data with only one of "0" and "1". However, initialization is basically the same as erasing. Therefore, the initialization includes not only “0” and “1” but also a process for preventing content data from being reproduced widely.

(Specific Flow of Second Embodiment)

The specific flow of this embodiment is as follows.
0 (210 in the first embodiment) compares the first time with the second time, and the flow until the reproduction of the content data is permitted based on the comparison result is the same as in the first embodiment. Omitted. In this embodiment, when the permission unit does not permit the reproduction, the content data associated with the file time information is initialized.

(Processing Flow of Second Embodiment)

FIG. 9 is a flowchart showing an example of the processing flow of the present embodiment. The flow of the process according to the present embodiment will be described with reference to FIG. However, one example of this “processing” is
The procedure can be implemented as a method, a computer-executable program, and a recording medium on which the program is recorded.

In a content data reproducing apparatus having a built-in clock section capable of adjusting time and having a file holding section for holding content data in association with file time information indicating time, first, content data is reproduced. (Content data acquisition step S
0901). Next, file time information associated with the content data is obtained from the file containing the content data (file time information obtaining step S090).
2). Further, the device time information associated with the content data is obtained (device time information obtaining step S09).
03). Further, the first time indicated by the file time information acquired in step S0902,
The second time indicated by the device time information acquired in step 0903 is compared (is the same or not) (comparison step S090)
4). Further, based on the comparison result (same), the reproduction of the content data associated with the file time information is permitted (permission step S0905). If the reproduction is permitted in step S0905, the content data is reproduced (reproduction step S0906). Further, based on the comparison result (not the same), reproduction of the content data associated with the file time information is not permitted (non-permission step S0907). Further, if the reproduction is not permitted in the step S0907, the content data associated with the file time information is initialized (initialization step S0908).

(Embodiment 3)

Next, a third embodiment will be described.

(Concept of Embodiment 3)

FIG. 10 is a diagram showing the concept of the present embodiment. The concept of the present embodiment will be described with reference to FIG.

User A receives a content data X from a server that distributes the content data through the Internet.
Download to your personal computer, and try to use the downloaded content data to friend B,
The downloaded content data was further illegally copied to a flexible disk and passed to B.

The friend B tried to play back the content data contained in the provided flexible disk on his / her personal computer, but the content data could not be played back without a unique opening key. Could not reproduce the content data.

The invention of the present embodiment provides a mechanism in which the content data illegally copied as described above cannot be reproduced by another content data reproducing device.

(Structure of Embodiment 3)

FIG. 11 is a diagram showing an example of the functional blocks of this embodiment. The configuration of the present embodiment will be described with reference to FIG.

In the present embodiment, a built-in clock section 1101, a file holding section 1102, an acquisition section 1103, a reproduction section 110
4. Device time information holding unit 1105, device time information writing unit 1106, file time information update unit 1107, file time information acquisition unit 1108, device time information acquisition unit 110
9, a content data reproducing apparatus including a permission unit 1110, an opening key holding unit 1111 and a receiving unit 1112.

Built-in clock section 1101, file holding section 11
02, acquisition unit 1103, reproduction unit 1104, device time information holding unit 1105, device time information writing unit 1106, file time information update unit 1107, file time information acquisition unit 1
108, device time information acquisition unit 1109, permission unit 111
0, the receiving unit 1112 is the same as the corresponding part of the first embodiment, and the description of the common part is omitted.

[0082] "Open key holding unit 1111" holds an open key uniquely associated with the content data reproducing apparatus. The “uniquely associated opening key” refers to an opening key assigned to one content data playback device on a one-to-one basis. For example, ID information of a device that identifies the content data playback device, or its ID information And information corresponding to one-to-one. Further, it is preferable that the opening key is held in an area that cannot be freely rewritten by an operation of a user of the content data reproducing apparatus. That is, it is to prevent a person who attempts an illegal operation by an illegal operation of the content data reproducing apparatus from replacing the opening key.

For example, by storing the ID information of the content data reproducing apparatus in a file containing the content data in association with the content data, and storing the ID information in the opening key storage unit, the ID information can be stored in a different content data reproducing apparatus. Even if a file containing the content data associated with the ID information is copied, the reproduction of the content data can be restricted as described later.

The contents data contained in the file held in the “file holding unit 1102” is sealed so as to be opened by the opening key. "Sealing openable" means that the content data is obtained or played back for playback only by using the opening key. More specifically, there is a case where the file is encrypted using the opening key as a decryption key.

For example, when the content data is received by the receiving unit 1112, the receiving unit 1112 performs the sealing.
May be performed by the content data reproducing apparatus after receiving the data, or may have been performed before the data is received.

When acquiring the content data, the acquiring unit 1103 acquires the opening key from the opening key holding unit 1111 and acquires the content data by opening the sealed content data.

Further, instead of the obtaining unit 1103 using the opening key, the reproducing unit 1104 may use the opening key.

(Specific Flow of Third Embodiment)

The specific flow of this embodiment will be described with reference to FIG.

User A received the content data X from the content data distribution server via the Internet at the receiving section of the content data reproducing apparatus Y. The content data X is sealed with an opening key YB uniquely associated with the content data reproducing device Y. The opening key YB is the ID “YC123” of the content data reproducing device Y.
4 ". The ID “YC1234”, which is the opening key YB, is held in the opening key holding unit.

The customer A illegally duplicates the received content data X on a flexible disk and gives it to a friend C for viewing.

A friend C holds the content data in the file holding unit in order to reproduce the content data X copied on the flexible disk with his / her own content data reproducing apparatus Z.

ID of content data reproducing apparatus Z of friend C
Is “ZC5678”, and the opening key ZC held in the opening key holding unit is the ID “ZC5678” uniquely associated with the content data reproducing apparatus Z.

The illegally copied content data X is sealed by the ID “YC1234” which is the opening key YC, and cannot be obtained for reproduction without the opening key without the opening key YC. The content data reproducing apparatus Z of the friend C transmits the ID “YC1” which is the opening key YC.
234 "is not held, but what is held is the ID" ZC5678 "which is the opening key ZC. Therefore, friends
In the content data reproducing device C, the content data X
Could not be opened. Eventually, the content data reproducing apparatus Z of the friend C could not reproduce the content data that the customer A illegally copied.

(Processing Flow of Third Embodiment)

FIG. 13 is a flowchart showing an example of the processing flow of the present embodiment. The flow of the process according to the present embodiment will be described with reference to FIG. However, an example of this “processing” can be implemented by executing the procedure as a method, a computer-executable program, or a recording medium on which the program is recorded.

First, in order to play back the content data that is sealed by the opening key so as to be opened, the opening key that is uniquely associated with the content data reproducing apparatus is obtained (opening key obtaining step S1301). Next, the sealed content data is opened (opening step S1302). Finally, the content data opened in step S1302 is acquired (acquisition step S
1303).

(Brief Description of Effect of Third Embodiment)

When the content data is reproduced by using the content data reproducing apparatus of the present embodiment and is intended to be used by others, the content data reproducing apparatus cannot acquire the content data with a key other than the specific opening key. Therefore, one content data cannot be used by multiple people.

For example, as described above, the I / O of the content data reproducing apparatus that receives and holds the content data
By associating with D, the effect can be obtained by changing the content data reproducing device so that the content data cannot be used.

(Embodiment 4)

Next, a fourth embodiment will be described.

(Concept of Embodiment 4)

The present embodiment has basically the same configuration as the first embodiment, but when the permission unit does not permit reproduction,
It is characterized by transmitting a fraudulent notification through a communication network.

FIG. 14 is a diagram showing the concept of the present embodiment. The concept of the present embodiment will be described with reference to FIG.

[0106] The customer A downloads the content data X including the information on the viewing period to the content data reproducing apparatus via the Internet. The customer A tried to copy the content data X (content data Y) and use it illegally. The information on the viewing period is updated when the reproduction start possible date and time is reproduced by using the technology described in Japanese Patent Application No. 2001-316237 as described above. Can not do it.

[0107] After the viewing period of the content data X has elapsed, the user A illegally changes the built-in clock section of the playback device to a date and time at which the content data Y can be viewed, and the information on the viewing period has not been updated. An attempt was made to play back the illegally copied content data Y, but the playback device detected this as fraudulent, and transmitted a fraudulent notification via the Internet.

The invention of this embodiment provides a mechanism in which, when attempting to reproduce the illegally copied content data as described above, it is detected as illegal and transmitted through a communication network.

(Structure of Embodiment 4)

FIG. 15 is a diagram showing an example of a functional block according to the fourth embodiment. The configuration of the present embodiment will be described with reference to FIG.

In this embodiment, a built-in clock section 1501, a file holding section 1502, an acquisition section 1503, and a reproduction section 150 are provided.
4. Device time information holding unit 1505, device time information writing unit 1506, file time information update unit 1507, file time information acquisition unit 1508, device time information acquisition unit 150
9, a content data reproducing apparatus including a permission unit 1510 and a transmission unit 1511.

Built-in clock section 1501, file holding section 15
02, acquisition unit 1503, reproduction unit 1504, device time information holding unit 1505, device time information writing unit 1506, file time information update unit 1507, file time information acquisition unit 1
508, device time information acquisition unit 1509, permission unit 1510
Is the same as the corresponding part of the first embodiment, and the description of the common part will be omitted.

[0113] The "transmitting unit 1511" transmits an unauthorized notification via the communication network when the permission unit does not permit reproduction of the content data. "When the reproduction is not permitted" means that the first time indicated by the file time information associated with the content data is compared with the second time indicated by the device time information held in association with the content data. The case where the results are not the same corresponds to such a case. In such a case, the transmitting unit notifies the user of the fraud through the communication network. The notification of the fraud is sent to the content data distribution server 15 that distributes the received content data.
13 or another server.

[0114] The "illegal notification" includes information indicating that the first time does not coincide with the second time, ID information of the content data reproducing apparatus, information on a user of the content data reproducing apparatus, and the like. It is.

By transmitting the fraudulent notification in this manner, for example, the content data distribution side may be able to receive the fraudulent notification and know the fact that the content data has been fraudulently copied. Information can be obtained to take measures against such unauthorized use. For example, when the first time and the second time are different (when the first time is older than the second time), there is a high possibility that the content data associated with the file time information indicating the first time has been copied. It is.

(Specific Flow of Embodiment 4)

The specific flow of this embodiment is as follows.
10 (210 in the first embodiment) compares the first time with the second time, and based on the comparison result, the flow until the reproduction of the content data is permitted is the same as in the first embodiment. Omitted. In the present embodiment,
When the permission unit does not permit the reproduction, the transmission unit transmits a fraud notification through the communication network.

(Processing Flow of Fourth Embodiment)

FIG. 16 is a flowchart showing an example of the processing flow of the present embodiment. The flow of the process according to the present embodiment will be described with reference to FIG. However, an example of this “processing” can be implemented by executing the procedure as a method, a computer-executable program, or a recording medium on which the program is recorded.

First, in a content data reproducing apparatus having a built-in clock section capable of adjusting time and having a file holding section for holding content data in association with file time information indicating time, first, content data is reproduced. (Content data acquisition step S
1601). Next, file time information associated with the obtained content data is obtained (file time information obtaining step S1602). Further, device time information associated with the obtained content data is obtained (device time information obtaining step S1603). The first time indicated by the file time information obtained in step S1602 is compared with the second time indicated by the device time information obtained in step S1603 (whether they are the same or not)
Yes (comparison step S1604). Further, based on the comparison result (identical), reproduction of the content data associated with the file time information is permitted (permission step S1605). If the reproduction is permitted in step S1605, the content data is reproduced (reproduction step S1606). Further, based on the comparison result (not the same), reproduction of the content data associated with the file time information is not permitted (non-permission step S1607). Further, if the reproduction is not permitted in the step S1607, a notification of impropriety is transmitted through the communication network (an improper notification transmission step S160).
8).

(Brief Description of Effect of Embodiment 4)

By using the content data reproducing device of the present embodiment, the content data reproducing device is associated with the file time information indicating the first time which is not the same as the second time indicated by the device time information held in association with the content data. It is possible to restrict the reproduction of the content data that is being copied, that is, the illegal content data having a high possibility of being copied. Further, the process of the content data reproducing apparatus for reproducing the copied content data can be transmitted to the content data distribution server or the like which distributes the content data as an unauthorized notification.

[0123]

According to the present invention, a content data reproducing apparatus, a content data distribution server, a content data management system,
Use of a content data playback program prevents content data playback devices that play back content data from illegally duplicating the content data and playing it back after unauthorized manipulation of the built-in clock section can do.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the concept of a first embodiment.

FIG. 2 is a diagram illustrating an example of a functional block according to the first embodiment;

FIG. 3 is a diagram illustrating an example of a functional block according to the first embodiment;

FIG. 4 is a view showing an example of the concept of the first embodiment;

FIG. 5 is a diagram showing a specific flow of the first embodiment.

FIG. 6 is a flowchart showing the flow of processing according to the first embodiment;

FIG. 7 is a view showing an example of the concept of the second embodiment;

FIG. 8 is a diagram illustrating an example of a functional block according to a second embodiment;

FIG. 9 is a flowchart showing the flow of processing according to the second embodiment.

FIG. 10 is a diagram showing an example of the concept of the third embodiment.

FIG. 11 is a diagram illustrating an example of a functional block according to a third embodiment;

FIG. 12 is a diagram showing a specific flow of the third embodiment.

FIG. 13 is a flowchart showing the flow of processing according to the third embodiment.

FIG. 14 is a diagram showing an example of the concept of the fourth embodiment.

FIG. 15 is a diagram illustrating an example of a functional block according to a fourth embodiment;

FIG. 16 is a flowchart showing the flow of processing according to the fourth embodiment.

[Explanation of symbols]

201 Built-in clock section 202 File holding unit 203 Acquisition unit 204 playback unit 205 Device time information holding unit 206 Device time information writing unit 207 File time information update unit 208 File Time Information Acquisition Unit 209 Device time information acquisition unit 210 Permission Division 211 Receiver

Continuation of front page    F-term (reference) 2F002 AA12 BB00 BB04 DA00 FA32                       GA08 GA16 GA17 GC05 GC22                 5B017 AA06 BB10 CA16                 5C053 FA13 GB06 JA22 LA06 LA11                       LA14                 5D044 BC01 BC04 CC09 DE17 DE50                       EF05 FG18 GK12 HL11

Claims (20)

[Claims] 1. A content data reproducing apparatus having a built-in clock section capable of adjusting time, a file holding section for holding content data in a file in association with file time information which is information indicating time, and a content holding section for storing the content data. An acquisition unit that acquires for reproduction, a reproduction unit that reproduces the content data acquired by the acquisition unit, and reproduction time information that is a time at which the reproduction was performed by the reproduction unit is held as device time information. A device time information holding unit, and a device that acquires playback time information from the internal clock unit as device time information when playback is performed by the playback unit, and writes the device time information in the device time information holding unit in association with the content data. A time information writing unit, and acquiring time information from the internal clock unit as file time information when the reproduction is performed by the reproduction unit, A file time information update unit that updates file time information associated with the content data; and a file time information acquisition unit that acquires file time information associated with the content data acquired by the acquisition unit from a file containing the content data. A device time information acquisition unit that acquires device time information associated with the content data acquired by the acquisition unit from the device time information holding unit; and a first time indicated by the file time information acquired by the file time information acquisition unit. A content data reproducing device, comprising: a time unit that compares a time with a second time indicated by the device time information acquired by the device time information acquiring unit, and permits the content data to be reproduced based on the comparison result. 2. The content data is distributed from a content data distribution server through a communication network, and further includes a receiving unit that receives the content data distributed from the content data distribution server. 3. The content data reproducing device according to 1. 3. A content data reproducing apparatus having a built-in clock section capable of adjusting time, a file holding section for holding content data in a file in association with file time information, which is information indicating time, and a content holding section. An acquisition unit that acquires for reproduction, a reproduction unit that reproduces the content data acquired by the acquisition unit, and a file that includes file time information associated with the content data acquired by the acquisition unit. A file time information acquisition unit that acquires the reproduction time information, which is the time at which the reproduction was performed by the reproduction unit, as device time information that is associated with the reproduced content data; For acquiring device time information associated with content data to be stored from a device time information holding unit Time information acquisition unit, a first time indicated by the file time information acquired by the file time information acquisition unit, and a second time indicated by the device time information acquired by the device time information acquisition unit, A content data reproducing apparatus, comprising: a permission unit that permits reproduction of the content data based on the comparison result. 4. A content data reproducing apparatus having a built-in clock part capable of adjusting time, comprising: a file holding part for holding content data in a file in association with file time information which is information indicating a time; An acquisition unit that acquires for reproduction, a reproduction unit that reproduces the content data acquired by the acquisition unit, and reproduction time information that is a time at which the reproduction was performed by the reproduction unit is held as device time information. A device time information holding unit, and a device that acquires playback time information from the internal clock unit as device time information when playback is performed by the playback unit, and writes the device time information in the device time information holding unit in association with the content data. A time information writing unit, and acquiring time information from the internal clock unit as file time information when the reproduction is performed by the reproduction unit, And file time information updating unit for updating the file time information associated with the content data, the content data reproducing apparatus comprising a. 5. The reproduction unit reproduces content data when the comparison result of the second time indicated by the device time information is the same as the first time indicated by the file time information. 4. The content data reproducing device according to claim 1, wherein the content data reproducing device permits 6. An apparatus according to claim 1, further comprising an initialization section for initializing content data associated with said file time information when said permission section does not permit reproduction. 3. The content data reproducing device according to 1. 7. An apparatus according to claim 1, further comprising an opening key holding section for holding an opening key uniquely associated with the content data reproducing apparatus, wherein the content data held in said file holding section is sealed by said opening key so as to be opened. And
The acquisition unit according to any one of claims 1 to 4, wherein, when acquiring the content data, the acquisition unit acquires an opening key from the opening key holding unit, and acquires the content data by opening the sealed content data. A content data reproducing device according to any one of the first to third aspects. 8. An apparatus according to claim 1, further comprising an opening key holding section for holding an opening key uniquely associated with the content data reproducing apparatus, wherein the content data held in said file holding section is sealed by said opening key so as to be opened. And
The playback device according to any one of claims 1 to 4, wherein the playback unit obtains an opening key from the opening key holding unit and plays back the content data by opening the sealed content data when playing back the content data. A content data reproducing device according to any one of claims 1 to 3. 9. The content data according to claim 1, further comprising: a transmission unit for transmitting an unauthorized notification via a communication network when the permission unit does not permit reproduction of the content data. Playback device. 10. The content data reproducing apparatus according to claim 2, wherein said receiving section transfers content data to said file holding section. 11. The content data reproducing apparatus according to claim 2, wherein the receiving unit transfers the content data to the obtaining unit. 12. The method according to claim 1, wherein the file holding unit divides and distributes the content data based on a rule and holds the content data, and the obtaining unit performs inverse conversion on the content data based on the rule to decode and obtain the content data. 12. The method according to claim 1, wherein:
3. The content data reproducing device according to 1. 13. The method according to claim 1, wherein the communication network is used.
A content data distribution server that distributes the content data described in 1. 14. A content data distribution server for transmitting the content data according to claim 1 and the opening key according to any one of claims 7 and 8 through a communication network. 15. A content management system in which a content distribution server and a content data reproducing device are connected via a communication network, wherein the content data reproducing device is the content management device according to claim 2. A content data management system that is a data playback device. 16. A program for reproducing content data in a content data reproducing apparatus having a built-in clock section capable of adjusting time and having a file holding section for storing content data in association with file time information indicating time. A process of acquiring content data for reproduction, a process of acquiring file time information associated with the acquired content data, and a process of acquiring device time information associated with the acquired content data. The first time indicated by the acquired file time information is compared with the second time indicated by the acquired device time information, and based on the comparison result, a process of permitting reproduction of the content data and a process of permitting the reproduction are performed. And causing the computer to execute a process of reproducing content data based on the content data. Content data playback program. 17. A program for playing back content data in a content data playback device having a built-in clock section capable of adjusting time and having a file holding section for holding content data in association with file time information indicating time. A process of reproducing the content data based on the permission of the reproduction, and when the content data is reproduced, the reproduction time information is acquired as the device time information from the built-in clock section and held in association with the content data. When the processing and the reproduction of the content data are performed, the computer obtains the reproduction time information from the internal clock section as file time information, and updates the file time information associated with the content data. A content data reproducing program configured to cause the content data to be reproduced. 18. A content data distribution server for transmitting the content data reproduction program according to claim 16 via a communication network. 19. A content data distribution server for transmitting the content data reproduction program according to claim 17 through a communication network. 20. A content data distribution server for transmitting both the content data reproduction program according to claim 16 and the content data reproduction program according to claim 17 to a same destination via a communication network.