Abstract: Regularity information such as time codes embedded preliminarily through an electronic watermark is detected from a predetermined number of pieces of continuous frame data of video content through the electronic watermark. In the case where the electronic watermark is not detected from the predetermined number of pieces of continuous frame data, a non-detection count is calculated, and falsification of the predetermined number of pieces of frame data is determined on the basis of the detected regularity information and the non-detection count. Accordingly, falsification such as deletion, addition, and replacement of video content is detected with high accuracy using the electronic watermark.

Abstract: Regularity information such as time codes embedded preliminarily through an electronic watermark is detected from a predetermined number of pieces of continuous frame data of video content through the electronic watermark. In the case where the electronic watermark is not detected from the predetermined number of pieces of continuous frame data, a non-detection count is calculated, and falsification of the predetermined number of pieces of frame data is determined on the basis of the detected regularity information and the non-detection count. Accordingly, falsification such as deletion, addition, and replacement of video content is detected with high accuracy using the electronic watermark.

Abstract: The problem to be solved is to allow anyone other than the contents license owner to acquire a right usage opportunity of contents while the fraud in the contents can be detected. To solve this problem, a contents ID, distribution media information specifying the distribution media of the contents, and identification information containing distribution period information specifying the distribution period of the contents are attached to the contents body When a contents acceptance module 140 receives the contents data, an acquisition pattern recognition unit 142 recognizes the acquisition pattern information of the contents data. A identification information extraction module 154 of a contents validity determination module 150 extracts identification information from the contents data.

Abstract: An intended image data structure is assumed to have a color information storing region and a pixel information storing region as its components. First, consider that the color information storing region within the image data structure is divided into a plurality of subregions, and a corresponding bit value is defined for each of the subregions. Next, an index number stored for each of pixels within the pixel information storing region is changed to an index number belonging to a subregion corresponding to a bit value of information to be embedded. In this way, one bit or more of information can be embedded for each pixel. Thus, a large amount of information can be embedded into a small-size image composed of simple shapes and having a small number of colors without degrading the image quality, and the information can be extracted from the image in which it has been embedded.

Abstract: A keyword-based information retrieving method which accepts a group of keywords entered from a user when the user makes a request for a search, sets a particular keyword within the group of keywords entered from the user as a main keyword, sets the remaining keywords other than the main keyword as additional keywords, modifies the additional keyword having a low relativity to the main keyword to a keyword having a high relativity, and conducts a search requested by the user using the group of modified keywords.

Abstract: An input for designating sent-out contents capable of being browsed on a provider-side processing apparatus is accepted. Ticket information for identifying a sending-party of sent-out contents is received from the provider-side processing apparatus. The sent-out contents and the ticket information are transmitted to a deliberation support processing apparatus to request a deliberation about the sent-out contents. The sent-out contents and the ticket information are stored into a deliberation managing database. An input of a deliberation result of the requested deliberation is accepted to store the deliberation result into the deliberation managing database. The ticket information is transmitted to a ticket management processing apparatus. Presentation of personal information on the sending-party is requested. The personal information on the sending-party identified by the ticket information is transmitted to the deliberation support processing apparatus.

Abstract: An access control method for controlling an execution of an access content accepted from a user, which includes the steps of: accepting an access content representing a content of an access requested by the user; requesting an execution of the accepted access content by the sending the access content along with an attribute of the user; and executing the requested access content in a range that matches the user attribute sent together with the access content. This method allows detailed access controls tailored to individual users without increasing a burden of user management on a processor that executes the requested access content.