JP2006146743A - Content filtering method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect children from harmful contents by finding the harmful contents which are easy to access, such as advertisement e-mails of a harmful site, quicker than the children and rating them. <P>SOLUTION: Reception reservation of an E-mail can be designated according to a decision of a portable terminal contractor (guardian). As information on reception reservation designation, presence of reservation designation, a list of transmitters who are not reserved (for example, E-mail addresses of the family), and a held time are registered to a mail server of an Internet Service Provider (ISP). Also, as information on an access to mobile contents, permission rating levels can be registered. The mail server of the ISP checks if an URL is included in the main text with respect to E-mails to be reception reservation designation objects and, when it is included, sends the URL to a rating institution while reserving distribution to a portable terminal during a designated held time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a content filtering method, and more particularly to a content filtering method in which a URL is notified by an electronic mail such as an advertisement mail.

(1) Content filtering method It is a social problem that young people access harmful contents. As content filtering methods for preventing this, a content check method, a URL check method (white list method, black list method), and a rating method (self-rating, rating by a third party) have been proposed (“harmful mobile” Research on content filtering system (2002 research report) “Ministry of Internal Affairs and Communications (trusted by Digital Media Association) (Non-patent Document 1)”. Self-rating cannot be adopted alone because it cannot be expected to be appropriate as a vicious company. Other than self-rating, it is necessary to store the criteria (harmful word list, URL, rating information) in the database, but it is difficult to prepare the data that is the criteria for the content that is newly generated or updated every day. It is. First of all, it is impossible to comprehensively collect all the contents that change every day. Furthermore, it takes time to create and rate blacklists and whitelists for collected content. Even sites that are on the whitelist need to be monitored constantly, and sites that should be blacklisted one after another. Therefore, there is a problem that a time difference is unavoidable from the generation of content until filtering can be performed.

(2) Internet Content Filtering System For Internet content, some filtering software and filtering services are provided (Non-Patent Document 1). In addition to providing filtering software / services, the Internet Association has established a “contact point for potentially harmful web pages”, which ranks the URL information received through contact forms and emails and reflects it in the filtering software / service. ing. However, there is a problem that the content is updated daily and the rating is not in time. In addition, in the case of mobile content, there is a problem that it is difficult to collect it efficiently and completely by robot search or the like due to circumstances such as fewer links compared to general Internet content.

(3) Spam mail filtering method Spam mail is also a social problem, and several filtering software and filtering services are provided. Content check (if a specific word specified by the user appears in the text, it is judged as spam), sender check (if the number of rejected messages from the same sender exceeds a certain number, spam sender) And automatically rejects reception) (Japanese Patent Laid-Open No. 2003-173314 (Patent Document 1)), stores information such as URL and telephone number from the contents of the mail that the recipient wants to reject, From the next time onward, there is a conventional technique of rejecting mails including the same URL, telephone number, etc. (Japanese Patent Laid-Open No. 2003-263391 (Patent Document 2)). However, both of them are intended to “reduce” junk e-mails, and if they arrive, it is not possible to prevent access to harmful sites from junk e-mails.

(4) Mobile content access method The mobile content has the following characteristics.
(A) Since the amount of data per content and the area of one screen are limited, not many links are set.
(B) In some cases, it is not recommended to link to content other than official content from so-called official content approved by the carrier.
(C) Difficult to search with search engines (search operations are cumbersome. Also, search engines are difficult to find the presence of content for the above reasons)
(D) It is difficult to set an advertising banner because the screen area is small.

Therefore, for mobile content, advertising mail is frequently used as a method for appealing to the presence of general sites other than the official site. There are many cases where children access harmful content such as dating sites.
(a) Access with interest from advertising mail
(b) Access the URL in the email from a friend
(c) Access by manually entering the URL seen in a magazine or flyer or the URL heard from a friend Of the above, the advertisement email is likely to be sent immediately after the content is generated. Therefore, there is a problem that there is a high possibility that the information for evaluating the content is not included in the filtering DB (black list / white list, rating, etc.).

JP 2003-173314 A

JP 2003-263391 A “Survey research on filtering system for harmful mobile contents (2002 research report)” Ministry of Internal Affairs and Communications (Contract: Digital Media Association)

  The challenge is to find and rate accessible harmful content before children. If an advertisement email for a harmful site arrives at the child and the filtering organization can discover and evaluate the presence of the site before the child accesses the harmful content, the child can be protected from the most easily accessed harmful content.

  An electronic mail reception suspension designation can be made at the judgment of a mobile terminal contractor (for example, a guardian). As information related to reception hold designation, presence / absence of hold designation, a list of callers not subject to hold (for example, family mail addresses), and a hold time can be registered in an ISP (Internet Service Provider) mail server. In addition, an allowable rating level can be registered as information related to access to mobile content. The ISP mail server checks whether or not a URL is included in the body of the mail subject to reception hold designation, and if it is included, the URL is sent to the rating agency, while the specified hold time , Hold distribution to mobile devices.

  In the black list method, it is possible to reduce the risk of accessing new harmful content that is not yet on the black list. In the whitelist scheme, the new site has not yet been rated and access is likely to be restricted. By notifying the rating organization of the URL in the mail, it is possible to speed up the rating of easily accessible pages.

  The present invention relates to a mobile content filtering service in cooperation with an e-mail distribution service, and this embodiment is an embodiment in the case where a third party rating organization is provided in a mobile communication carrier network.

  FIG. 1 is a block diagram of a mobile content filtering service system showing a first embodiment of the present invention. In FIG. 1, 1 to 3 are mobile terminals that can use the mobile Internet access service, 4 is a base station, 5 is a mobile gateway, 6 is a mobile gateway server, 7 is an official site server, 8 is a mobile Internet access network, and 9 to 10 Is a general site server, 11 is an Internet service provider (ISP), 12 is an ISP server, 13 is a mail server, 14 is a content filtering server, 15 is a rating agency, 16 is a rating server, and 17 is a content filtering DB. The content filtering DB 17 stores content ratings evaluated by rating agencies in association with URLs.

Hereinafter, the operation of the electronic mail delivery service system and the operation of the content filtering service system will be described.
First, the operation of the electronic mail delivery service system in the mail server 13 will be described using the flowchart of FIG. When mail arrives from the mobile Internet access network 8 to the mail server 13 via the ISP server 12, the mail server 13 obtains receiver registration information (hold designation, list of callers not to be held, hold time) (S201). The recipient registration information can be registered in a server operated by the mobile phone carrier when the mobile phone contract is made. Whether there is a hold designation is checked (s202), and if there is no hold designation, the mail is delivered (s210). If there is a hold designation, check whether the caller's email address is in the list of callers that are not on hold (for example, a list of callers that the parent or guardian has approved as not on hold) If it is in the list (s203), the mail is delivered (s210). If not in the list, the URL contained in the text is extracted (S205).

  If the URL is not included in the text (s206), the mail is delivered (s210). If the URL is included (s206), the scheduled mail delivery time is set based on the hold time specified in the registration information, the delivery is suspended (s207), and the URL is sent to the rating agency (s208). A mail containing a URL is likely to be an advertisement mail, and a URL contained in the advertisement mail is likely to be a new page. The new page may be from a new harmful site that has not yet been blacklisted. Even sites that were not previously harmful sites may have added harmful content. Therefore, the URL is sent to the rating agency for the purpose of notifying the rating agency of the existence before the child accesses. The suspended mail is delivered (s209) when the mail delivery scheduled time is reached (s209). Here, by setting a hold time until mail delivery, the time it takes for the user to receive the mail and access the content is lengthened, and the screening by the rating agency is completed before the user accesses it. It becomes possible.

  Rating agencies find pages with potentially harmful content, manually review them according to certain criteria, and create a blacklist. As a page having a possibility of harmful content, in addition to the URL sent from the above-described reserved user, a page collected using a keyword that tends to appear in the harmful content is targeted. In addition, a mechanism may be adopted in which an advertisement email of a harmful site is forwarded from an adult volunteer, and a certain number of forwarded messages may be automatically put on a black list. The rating organization associates the rating of the content of each URL with the URL and stores them in the content filtering DB 17.

  Next, the operation of the filtering service system in the content filtering server 14 will be described using the flowchart of FIG. The ISP server 12 receives the mobile content request from the terminal via the mobile gateway server 6 (s301). The mobile content request includes URL and allowable rating level information. Based on the received URL, the rating agency is inquired about the rating information of the URL (s303), and the rating information of the URL is received from the rating agency (s304). Alternatively, only the URL is included in the mobile content request, and it is checked whether the user of the terminal that sent the mobile content request in the carrier is registered in the rating service. The content filtering DB 17 may be accessed by extracting the allowable rating level in the user information.

  If the received rating information is within the allowable rating level range (s305), the URL page is displayed (s306). If it is outside the allowable rating level range, the message “This page cannot be displayed” is displayed (s307). In this embodiment, it is assumed that the rating organization adopts the black list method. That is, the rating agency has a list of harmful sites and their rating levels. Therefore, when the URL is not on the black list, the page of the URL is displayed. However, if the rating agency adopts the white list method (has a list of non-hazardous sites), if the URL is not on the white list, the page of the URL is not displayed and “this page Is not displayed. "

  When the rating organization adopts the white list method, as a second embodiment of the present invention, it is conceivable that the reception is not suspended if the URL in the mail is on the white list. The operation of the electronic mail delivery service system in the mail server 13 will be described using the flowchart of FIG. When the URL is included in the mail body (s406), the mail delivery scheduled time is set according to the hold time specified by the recipient registration information (s407). In the second embodiment, thereafter, the rating information of the URL is inquired to the rating agency (s408), and the rating information of the URL is received from the rating agency (s409). If the URL is on the white list and is within the allowable rating level of the recipient (s410), the mail is immediately delivered (s410). If the rating is out of the allowable rating level or not on the white list, the rating information is periodically inquired until the scheduled mail delivery time is reached (s411) (s408). When the scheduled mail delivery time is reached (s411), the mail is delivered.

  In the case of the white list method, there is a possibility that the site including the URL page is a newly added harmful page even if it is on the white list. It is safer to wait for the update. However, the convenience of the second embodiment in which it is not suspended if it is on the white list can be avoided.

  In the above description, an example in which a mobile terminal receives a mail and requests a content has been described. However, the present invention is not limited to mobile, and the present invention is also effective when using a computer. When a computer is used as a user terminal, management of user registration information to be performed by the carrier and other control for access restriction in the above description may be performed by an Internet service provider or the like.

It is a figure which shows the structure of the Example of the mobile content filtering method of this invention. It is a flowchart which shows operation | movement of the electronic mail delivery service system in 1st Example of this invention. It is a flowchart which shows operation | movement of the filtering service system in the 1st and 2nd Example of this invention. It is a flowchart which shows operation | movement of the electronic mail delivery service system in 2nd Example of this invention.

Explanation of symbols

  1-3: Telephone terminals that can use the mobile Internet access service, 4: Base station, 5: Mobile gateway, 6: Mobile gateway server, 7: Official site server, 8: Mobile internet access network, 9-10: General site server 11: Internet service provider (ISP), 12: ISP server, 13: mail server, 14: content filtering server, 15: rating agency, 16: rating server, 17: content filtering DB.

Claims (3)

In a system for sending and receiving e-mail,
The registration information regarding the recipient's email reception can be registered whether there is a hold designation, the list of callers not subject to hold, the hold time,
That allowed rating levels can be registered as registration information for the recipient's Internet access,
Obtaining registration information about the recipient's email receipt before delivering the email;
Determining whether there is a hold designation based on the registration information;
Determining whether the sender is on hold,
Extracting a URL from the email body;
Providing a scheduled delivery time based on the hold time registered by the recipient when the URL is included in the mail text;
A content filtering method characterized in that delivery is suspended until a scheduled delivery time for a mail that is subject to suspension designation.   2. The content filtering method according to claim 1, wherein if the URL is included in the mail text, the URL is sent to a rating agency. The content filtering method according to claim 1, wherein when the URL is included in the mail text, the rating information of the URL is inquired to the rating agency at least once;
A step of comparing the rating information of the URL obtained from the rating agency and the allowable rating level registered by the recipient,
A content filtering method, wherein mail is delivered when it is found that the URL is within an allowable rating level.

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