JP2004078381A - Content illegal use prevention method and apparatus - Google Patents

Abstract

In a content distribution service for a user who remotely accesses a private network through a dial-up connection, a source of illegally used content can be uniquely specified.
A connection is made between dial-up connection processing means for storing connection information of dial-up connection in a connection information DB, distribution reception processing means for performing reception processing for content distribution, and individual user connection information corresponding to a user ID. Connection information acquisition processing means for acquiring from the information DB, content marking processing means for embedding the individual user connection information in the content corresponding to the content ID, and content distribution processing for distributing the content in which the individual user connection information is embedded to the user terminal Means for embedding and distributing the individual user connection information stored in the connection information DB at the time of dial-up connection as copyright management information in the content at the time of content distribution.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a content unauthorized use prevention apparatus and a content unauthorized use prevention method for preventing unauthorized use by adding copyright management information to digital content. In particular, the present invention relates to a content illegal use prevention device and a content illegal use prevention method effective for providing a content distribution service to a user who remotely accesses a private network through a dial-up connection.
[0002]
[Prior art]
On the Internet, there are the following techniques as techniques for preventing illegal use of contents downloaded by an unspecified number of users. At the time of content distribution, copyright management information on the content such as content ID and content attribute information is embedded in the content by using a digital watermarking technology, and illegal use search can be performed from the embedded copyright management information to enable unauthorized use. Is to be prevented (suppressed).
[0003]
As a method of embedding the copyright management information and the like in the content, there is a Steganography technology and the like in addition to the digital watermarking technology described above, and further, there are a plurality of embedding methods having different protection levels of the embedding information for each technology.
[0004]
On the other hand, on a private network represented by a regional IP network, since the user is fixed during the connection by dial-up connection, the user authentication can be performed relatively easily and reliably, so that the content itself can be obtained. No special protection is performed. However, in order to prevent the content from being stored in the terminal of the user who has made a dial-up connection, the content is distributed using a streaming technique for receiving and reproducing data while viewing the content.
[0005]
[Problems to be solved by the invention]
By the way, the copyright management information embedded in the content uses information associated with the content, such as content ID and content attribute information, and has no information associated with the user of the content. For this reason, when unauthorized use is actually performed, it has been difficult to specify where the content leaked from.
[0006]
Further, since the protection level of the embedded information is different for each value of the content, it is necessary to change the embedding method for each content. However, in the related art, the embedding method cannot be selected for each content.
[0007]
Furthermore, even when a user dials up on a private network and provides a content distribution service using streaming technology, it is difficult to completely eliminate the accumulation of streaming data on the user side, and the accumulated data cannot be stored on the Internet. It was not possible to prevent unauthorized use.
[0008]
The present invention provides a content distribution service for a user who has remotely accessed a private network through a dial-up connection, by adopting a configuration capable of uniquely identifying a source of illegally used content, thereby preventing (suppressing) unauthorized use of content. It is an object of the present invention to provide a use prevention device and a method for preventing unauthorized use of contents.
[0009]
[Means for Solving the Problems]
According to the method for preventing unauthorized use of content of the present invention, a dial-up connection is made with a user terminal, the connection information is stored in a connection information DB, and a user ID and a content ID transmitted from the user terminal are input. Step 2 of performing reception processing for content distribution, Step 3 of acquiring individual user connection information corresponding to the user ID received in Step 2 from the connection information DB, and Step 3 of obtaining the content corresponding to the content ID received in Step 2. The method includes a step 4 for embedding the individual user connection information and a step 5 for distributing the content in which the individual user connection information is embedded to the user terminal. It is embedded in the content as the right management information and distributed when the content is distributed.
[0010]
Step 4 may include a processing procedure of selecting a marking method corresponding to the content ID for each content and embedding the individual user connection information. In addition, before step 4, a processing procedure for referring to the content position DB in which the location of the content corresponding to the content ID is registered and acquiring the content from the external network when the content exists in the external network may be included. Good. Further, as the connection information registered in the connection information DB, at least a part (for example, an area code) of the outgoing telephone number acquired at the time of dial-up connection may be used.
[0011]
The apparatus for preventing unauthorized use of content of the present invention performs dial-up connection with a user terminal, stores dial-up connection information in a connection information DB, and stores a user ID and a content ID transmitted from the user terminal. Distribution reception processing means for inputting and performing reception processing for content distribution, connection information acquisition processing means for acquiring individual user connection information corresponding to the user ID received by the distribution reception processing means from the connection information DB, and distribution reception Dial-up comprising: content marking processing means for embedding individual user connection information in the content corresponding to the content ID received by the processing means; and content distribution processing means for distributing the content in which the individual user connection information is embedded to the user terminal. The individual user connection information saved in the connection information DB at the time of connection To deliver embedded in the content at the time of content delivery as authority management information.
[0012]
Further, the content marking processing means may be configured to select a marking method corresponding to the content ID for each content and embed the individual user connection information. A content acquisition processing unit that refers to a content position DB in which a location of the content corresponding to the content ID is registered, and acquires the content from the external network and outputs the acquired content to the content marking processing unit when the content exists in the external network; May be provided. Further, as connection information registered in the connection information DB, at least a part of the outgoing telephone number acquired at the time of dial-up connection may be used.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
FIG. 1 shows a first embodiment of a device for preventing unauthorized use of contents according to the present invention.
In the figure, a content distribution server 10 and a remote access server 20 are connected via a private network 1 such as a LAN. The user terminal 30 and the remote access server 20 are dial-up connected via a public line network 2 such as a telephone line or an ISDN line.
[0014]
The content distribution server 10 includes a distribution reception processing unit 11, a connection information acquisition processing unit 12, a content marking processing unit 13, a content distribution processing unit 14, a user DB (database) 15 connected to the distribution reception processing unit 11, and a content marking process. The content DB 16 is connected to the unit 13. The remote access server 20 includes a dial-up connection processing unit 21 and a connection information DB 22.
[0015]
<Connection information DB>
In the connection information DB 22, connection information of the user terminal 30 connected to the private network 1 via the public line network 2 is registered. Specifically, as shown in FIG. 7, for each user ID sent from the user terminal 30, connection information such as a calling telephone number, a connection start time, and an IP address of the user terminal 30 having the user ID. Is stored.
[0016]
<User DB>
Information required for user authentication of the content distribution service is registered in the user DB 15. Specifically, as shown in FIG. 8, a password for authentication is stored in association with each user ID.
[0017]
<Content DB>
The content DB 16 stores content data before performing the marking process. The content data is stored in association with a content identifier (content ID) for uniquely identifying the content. For the content ID, for example, a standard defined by a content ID forum (www.cidf.org/) can be used.
[0018]
<Operation description>
An operation example (content unauthorized use prevention method) of the first embodiment of the content unauthorized use prevention device of the present invention will be described with reference to the flowcharts of FIGS.
[0019]
The user dials up from the user terminal 30 to the remote access server 20 of the private network 1 via a public line network 2 such as a telephone line or an ISDN line using a communication device such as a modem or a terminal adapter. At this time, the user inputs the address of the content distribution server 10 to be used, the user ID and password of the user, and the content ID of the content to be viewed. The dial-up connection processing unit 21 of the remote access server 20 associates with the user ID sent from the user terminal 30 and obtains the connection information (the calling telephone number, the connection start The time and the IP address are registered in the connection information DB 22 (step S11). When it is desired to specify the caller reliably, the call-back function is used at the time of dial-up connection to obtain the caller telephone number of the user terminal and authenticate the user.
[0020]
Next, the dial-up connection processing unit 21 connects the user terminal 30 to the content distribution server 10 based on the distribution server address sent from the user terminal 30. Here, the user ID and password of the user and the content ID of the content viewed by the user are transmitted to the distribution reception processing unit 11 of the content distribution server 10.
[0021]
The distribution reception processing unit 11 of the content distribution server 10 inputs the user ID and password of the user sent from the dial-up connection processing unit 21 and the content ID of the content to be viewed by the user. The user is authenticated with reference to the DB 15. After this authentication, the user ID is sent to the connection information acquisition processing unit 12, and the content ID is sent to the content marking processing unit 13 (step S12).
[0022]
The connection information acquisition processing unit 12 of the content distribution server 10 refers to the connection information DB 22 of the remote access server 20 based on the user ID sent from the distribution reception processing unit 11, and obtains the individual user connection information of the user corresponding to the user ID ( It obtains the calling telephone number, connection start time, IP address) I1 and sends the individual user connection information I1 to the content marking processing unit 13 (step S13).
[0023]
The content marking processing unit 13 inputs the content ID transmitted from the distribution reception processing unit 11 and the individual user connection information I1 transmitted from the connection information acquisition processing unit 12, and extracts the content C1 corresponding to the content ID from the content DB 16. Then, a content C1m with a mark in which the individual user connection information I1 is embedded in the content C1 by a predetermined marking method is created and output to the content distribution processing unit 14 (step S14). Here, as a content marking method, there are a digital watermark technology (reference document: Japanese Patent Application Laid-Open No. 2000-287073 (digital watermark embedding method, a digital watermark detection method, and a digital watermark embedding device ...)) and a Steganography technology (reference document: "Image deep encryption method using area division based on complexity", IEICE Technical Report, IE97-14, May 1997), and the like.
[0024]
The content distribution processing unit 14 sends the marked content C1m created by the content marking processing unit 13 to the dial-up connection processing unit 21 of the remote access server 20, and performs a dial-up connection via the public line network 2. The data is distributed to the terminal 30 (step S15). As a method of distributing the content, the entire content may be downloaded to the user terminal 30 and then viewed, or the content may be viewed while transmitting a part of the content data to the user terminal 30 using the streaming technology. Is also good.
[0025]
(Second embodiment)
FIG. 3 shows a second embodiment of the apparatus for preventing unauthorized use of contents according to the present invention.
The configuration of this embodiment is basically the same as the configuration of the first embodiment shown in FIG. 1, except that a marking method for embedding the individual user connection information I1 in the content can be selected in accordance with the content. I have. For this purpose, the content marking processing unit 13 includes a marking method selection processing unit 131, a marking method DB 132, and a marking processing unit 133.
[0026]
<Marking method DB>
In the marking method DB 132, a marking method for embedding the individual user connection information I1 for each content is registered. Specifically, as shown in FIG. 9, for each content identification number (content ID), a marking method number used for the content is stored.
[0027]
<Operation description>
An operation example (method of preventing content unauthorized use) of the second embodiment of the content unauthorized use prevention device of the present invention will be described with reference to the flowcharts of FIGS. The dial-up connection process (step S11), the distribution reception process (step S12), the connection information acquisition process (step S13), and the content distribution process (step S15) are the same as those in the first embodiment. The marking process is performed as follows.
[0028]
The content marking processing unit 13 inputs the content ID sent from the distribution reception processing unit 11 and the individual user connection information I1 sent from the connection information acquisition processing unit 12, and extracts the content C1 corresponding to the content ID from the content DB 16. . The marking method selection processing unit 131 refers to the marking method DB 132 based on the content ID, acquires the marking method number corresponding to the content ID (for example, if the content ID is “0001”, obtains the marking method number “1”), and performs marking. Output to the processing unit 133 (step S21). The marking processing unit 133 activates the marking method (here, # 1) specified by the marking method number sent from the marking method selection processing unit 131, and embeds the individual user connection information I1 in the content C1 by the marking method. The content with mark C1m is created and output to the content distribution processing unit 14 (step S22).
[0029]
Here, as the content marking method, there are the above-mentioned digital watermarking technology and Steganography technology, but each has advantages and disadvantages in terms of security, the amount of embedded information, and the like. However, in the present embodiment, there is an advantage that an optimum marking method can be selected in consideration of these conditions for each content.
[0030]
In the marking method selection process of the present embodiment, the marking method number associated with the content ID is registered in the marking method DB 132, and the marking method is selected for each content. The parameters (embedding strength and the like) used in (1) and (2) may be registered, and the individual user connection information may be embedded in the content by using the parameters at the time of the marking process.
[0031]
For the marked content already distributed to the content user, the marking method is confirmed by referring to the marking method DB 132 based on the content ID, and the individual user connection information embedded in the content by the marking method is read. be able to. Thus, illegal use of the content can be prevented (deterred).
[0032]
(Third embodiment)
FIG. 5 shows a third embodiment of the apparatus for preventing unauthorized use of contents according to the present invention.
The configuration of this embodiment is basically the same as the configuration of the first embodiment or the second embodiment, except that the content DB 16 does not exist in the content distribution server 10 but is installed in the external network 3. The points are different. For this purpose, the content distribution server 10 is provided with a content acquisition processing unit 17 and a content location DB 18, and connects the private network 1 and the external network 3 via a dedicated line and a network connection device 40 such as a router. The same applies to a case where the content DB 16 exists on the private network 1.
[0033]
<Content position DB>
In the content position DB 18, a location where content data exists is registered for each content. Specifically, as shown in FIG. 10, for each content identification number (content ID), location information (content location information URL) of the content is stored.
[0034]
<Operation description>
An operation example (contents unauthorized use prevention method) of the third embodiment of the contents unauthorized use prevention device of the present invention will be described with reference to the flowcharts of FIGS. The dial-up connection process (step S11), the distribution reception process (step S12), the connection information acquisition process (step S13), and the content distribution process (step S15) are the same as those in the first embodiment. The marking process and the new content acquisition process are performed as follows.
[0035]
The content acquisition processing unit 17 refers to the content position DB 18 based on the content ID sent from the content marking processing unit 13 and acquires the content position information URL. Further, it accesses the content DB 16 of the external network 3 via the network connection device 40 based on the content location information URL, acquires the content C2 corresponding to the content ID, and outputs it to the content marking processing unit 13 (step S31). .
[0036]
The content marking processing unit 13 inputs the content C2 sent from the content acquisition processing unit 17 and the individual user connection information I1 sent from the connection information acquisition processing unit 12, and connects the individual user to the content C2 by a predetermined marking method. A content C2m with the mark embedded with the information I1 is created and output to the content distribution processing unit 14 (step S32). Note that the content marking processing unit 13 may be capable of selecting a marking method as in the second embodiment.
[0037]
【The invention's effect】
As described above, according to the present invention, connection information when a user remotely accesses a private network through a dial-up connection can be embedded in content as copyright management information. This connection information is information uniquely tied to the user of the content, for example, a calling telephone number. It is possible to uniquely identify the source of the content. As a result, it is possible to prevent (suppress) unauthorized use of the content by the user of the private network.
[0038]
Also, by specifying an embedding method (marking method) for each content, it becomes possible to embed the copyright management information according to the protection level of the content.
[0039]
In addition, since the user can be specified using the connection information embedded in the content, even if the content is stored in the user terminal or a download service is provided, the illegal use of the content can be prevented.
[0040]
In addition, by embedding connection information, which is the user's private information, in the content, an effect of substantially preventing the user from leaking his / her own content to an unspecified number of users can be expected.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of an apparatus for preventing unauthorized use of content according to the present invention.
FIG. 2 is a flowchart showing a first embodiment of a method for preventing unauthorized use of contents according to the present invention;
FIG. 3 is a block diagram showing a second embodiment of the apparatus for preventing unauthorized use of contents according to the present invention;
FIG. 4 is a flowchart showing a second embodiment of the method for preventing unauthorized use of contents according to the present invention;
FIG. 5 is a block diagram showing a third embodiment of the device for preventing unauthorized use of contents according to the present invention;
FIG. 6 is a flowchart showing a third embodiment of a method for preventing unauthorized use of contents according to the present invention;
FIG. 7 is a diagram showing a configuration example of a connection information DB.
FIG. 8 is a diagram showing a configuration example of a user DB.
FIG. 9 is a diagram showing a configuration example of a marking method DB.
FIG. 10 is a diagram showing a configuration example of a content position DB.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Private network 2 Public line network 3 External network 10 Content distribution server 11 Distribution reception processing part 12 Connection information acquisition processing part 13 Content marking processing part 131 Marking method selection processing part 132 Marking method DB
133 marking processing unit 14 content distribution processing unit 15 user DB
16 Content DB
17 Content acquisition processing unit 18 Content position DB
20 remote access server 21 dial-up connection processing unit 22 connection information DB
30 user terminal 40 network connection device

Claims (8)

When content is distributed from a content distribution server located in a private network to a user terminal dial-up connected via a public line network, copyright management information is added to the content to prevent unauthorized use of the content. Content to prevent unauthorized use,
Making a dial-up connection with the user terminal and storing the connection information in a connection information DB (database);
Step 2 of inputting the user ID and the content ID transmitted from the user terminal and performing a reception process for content distribution;
Step 3 of acquiring individual user connection information corresponding to the user ID received in Step 2 from the connection information DB;
Step 4 of embedding the individual user connection information in the content corresponding to the content ID received in Step 2;
Delivering the content in which the individual user connection information is embedded to the user terminal,
A method for preventing unauthorized use of content, wherein individual user connection information stored in a connection information DB at the time of dial-up connection is embedded as content in the content distribution as the copyright management information and distributed. The method for preventing unauthorized use of content according to claim 1,
Step 4 is a method for preventing unauthorized use of content, which includes a processing procedure of selecting a marking method corresponding to the content ID for each content and embedding the individual user connection information. In the method for preventing unauthorized use of content according to claim 1 or 2,
Before the step 4, it is necessary to include a processing procedure of referring to a content location DB in which a location of the content corresponding to the content ID is registered, and acquiring the content from the external network when the content exists in the external network. Characteristic method of preventing unauthorized use of content. In the content unauthorized use prevention method according to any one of claims 1 to 3,
A method for preventing unauthorized use of contents, wherein at least a part of a calling telephone number obtained at the time of dial-up connection is used as connection information registered in the connection information DB. When content is distributed from a content distribution server located in a private network to a user terminal dial-up connected via a public line network, copyright management information is added to the content to prevent unauthorized use of the content. Device to prevent unauthorized use of content,
Dial-up connection processing means for making a dial-up connection with the user terminal and storing the connection information in a connection information DB (database);
Distribution reception processing means for inputting a user ID and a content ID transmitted from the user terminal and performing a reception process for content distribution;
Connection information acquisition processing means for acquiring individual user connection information corresponding to the user ID received by the distribution reception processing means from the connection information DB;
Content marking processing means for embedding the individual user connection information in content corresponding to the content ID received by the distribution reception processing means,
Content distribution processing means for distributing the content in which the individual user connection information is embedded to the user terminal,
An apparatus for preventing unauthorized use of content, wherein the individual user connection information stored in the connection information DB at the time of dial-up connection is embedded and distributed as the copyright management information in the content at the time of content distribution. The content unauthorized use prevention device according to claim 5,
The apparatus for preventing unauthorized use of content, wherein the content marking processing means is configured to select a marking method corresponding to the content ID for each content and embed the individual user connection information. The content unauthorized use prevention device according to claim 5 or 6,
Content acquisition processing means for referring to a content position DB in which the location of the content corresponding to the content ID is registered, and acquiring the content from the external network and outputting to the content marking processing means when the content exists in the external network A device for preventing unauthorized use of contents, comprising: The content unauthorized use prevention device according to any one of claims 5 to 7,
A device for preventing unauthorized use of contents, wherein at least a part of a calling telephone number obtained at the time of dial-up connection is used as connection information registered in the connection information DB.

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