Abstract: An information displaying method includes: obtaining, for each of users, usage history information items on one or more appliances used by the user; calculating a utilization characteristic based on a usage history information item on a predetermined appliance among the one or more appliances used by a predetermined user among the users, the utilization characteristic being of the predetermined user using the predetermined appliance, and the usage history information item on the obtained predetermined appliance; obtaining, for each of the user, a post information item posted by the user; and displaying, in association with each other, (i) a utilization characteristic information item on the utilization characteristic calculated in the calculating and (ii) the post information item posted by the predetermined user, the utilization characteristic being of the predetermined user using the predetermined appliance, and the post information item being obtained in the obtaining of a post information item.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: A content control device is provided with a receiving content accumulation unit which accumulates contents received from a terminal device connected via a network, an operation history information managing unit which manages operation history information indicative of a history on operations with respect to a first content accumulated in the receiving content accumulation unit, and a content control unit which generates control information for controlling a second content based on the operation history information, the second content corresponding to the first content and accumulated in the terminal device.

Abstract: A recording medium, which is provided by a content provider and allows the content provider to control messages, has recorded thereon content and a program executed at a time of playback of the content by a playback apparatus. The program causing the playback apparatus to interact with a different program prestored in the playback apparatus and executed at the time of the playback of the content and to transmit, to the different program, a message determined according to the result of the interaction. The playback apparatus includes a reading unit reading the program from the recording medium at the time of the playback of the content, a startup unit starting up the read program, an interaction unit interacting with the program, and a processing unit receiving a message corresponding to a result of the interaction from the recording medium and performing a process corresponding to the received message.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: An information processing device that attaches common accompanying data to a content group composed of contents. The information processing device acquires the contents, acquires one or more characteristics of each acquired content and searches among reference data items in order to acquire one or more reference data items that each include any of the one or more characteristics, each reference data item having attached thereto at least one attribute used for identifying the reference data item, the reference data items being data other than the contents. The information processing device then specifies, among the attributes attached to the acquired one or more reference data items, an attribute that also pertains to the contents, uses the specified attribute as an attribute for identifying each of the contents, and attaches the specified attribute to each of the contents.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: A content management server comprises: a first connection detection unit that detects whether or not the content management server is connected with the content-using device; a content management unit that manages the content according to a result of the detection by the first connection detection unit and holds information on how the content-using device controls the use of the content. A content-using device comprises: a second connection detection unit that detects whether or not the content-using device is connected with the content management server; a second selection unit that specifies a method for controlling the use of the content according to a result of the detection by the second connection detection unit; and a content control unit that controls the use of the content according to the method specified by the second selection unit.

Abstract: Provided is a content management device for protecting a content of a provider. A content management device 800 deletes one or more contents shared with and held by a user of another device. The content management device 800 comprises: a sharing unit 801 configured to distribute the contents to the user and thereby share the contents with the user; and a switching unit 802 configured to switch a method of the deletion to another method according to a time elapsed from the distribution.

Abstract: The present invention provides an information embedding apparatus that is capable of preventing playback stop of a content that has been shot without intention of misuse. The information embedding apparatus comprises: an acquisition unit operable to acquire the content that is played back along the playback time-line; a watermark generating unit operable to generate the watermarks such that values held by the watermarks vary according to a first rule, the first rule showing that the values should vary according to a sequential order on the playback time-line; and an embedding unit operable to embed two or more of the watermarks into the content while keeping the sequential order.

Abstract: A recording device records one or more subcontents constituting one content recorded on a first recording medium, onto a second recording medium, wherein the first recording medium has further recorded thereon digest values of the subcontents, and a medium signature generated based on the digest values of the subcontents. The recording device includes a subcontent acquisition unit that selects and acquires one or more subcontents permitted to be copied; an excluded digest value acquisition unit that acquires excluded digest values from the first recording medium, wherein the excluded digest values are digest values of nonselected subcontents; a signature acquisition unit that acquires the medium signature from the first recording medium; and a write unit that writes, onto the second recording medium, (i) the one or more selected subcontents, (ii) the excluded digest values and (iii) the medium signature.

Abstract: The management-apparatus card capable of being attached to a management apparatus receives, from the measuring apparatus, first unique information indicating the measuring apparatus, and identification information indentifying a user of the measuring apparatus; stores second unique information indicating the management-apparatus card; generates a decryption key corresponding to an encryption key, using the first unique information, the second unique information, and the identification information; stores the generated decryption key; receives encrypted vital sign data from the measuring apparatus; decrypts the received vital sign data using the stored decryption key; and obtains the decrypted vital sign data.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: An information processing device that attaches common accompanying data to a content group composed of contents. The information processing device acquires the contents, acquires one or more characteristics of each acquired content and searches among reference data items in order to acquire one or more reference data items that each include any of the one or more characteristics, each reference data item having attached thereto at least one attribute used for identifying the reference data item, the reference data items being data other than the contents. The information processing device then specifies, among the attributes attached to the acquired one or more reference data items, an attribute that also pertains to the contents, uses the specified attribute as an attribute for identifying each of the contents, and attaches the specified attribute to each of the contents.

Abstract: An image output device includes a receiving unit which receives first input information including position information indicating a position on a display image, an attribute information selecting unit which selects first attribute information corresponding to the position indicated by the position information and is one of pieces of attribute information associated with the displayed image from among the pieces of attribute information, an image selecting unit which selects images having attribute information corresponding to the first attribute information from among images including the displayed image, a display sequence determining unit which determines the display sequence of the images based on the attribute information of each of the images selected by the image selecting unit, and an output unit which acquires and outputs the images such that the selected images are displayed in the determined display sequence on a display device.

Abstract: A program execution device capable of protecting a program against unauthorized analysis and alteration is provided. The program execution device includes an execution unit, a first protection unit, and a second protection unit. The execution unit executes a first program and a second program, and is connected with an external device that is capable of controlling the execution. The first protection unit disconnects the execution unit from the external device while the execution unit is executing the first program. The second protection unit protects the first program while the execution unit is executing the second program.

Abstract: A recording and reproduction apparatus for preventing illegitimate use of contents. A recording medium stores an inherent number in an unrewritable area. The recording apparatus writes media key data and an encrypted content onto the recording medium. The media key data includes encrypted media keys generated by (i) for each of unrevoked reproduction apparatuses, encrypting a media key using a device key of the unrevoked reproduction apparatus respectively, and (ii) for each of revoked reproduction apparatuses, encrypting detection information using a device key of the revoked reproduction apparatus. The reproduction apparatus decrypts the encrypted media key using a device key to generate a decryption media key, judges whether the decryption media key is the detection information, and prohibits the encrypted content recorded on the recording medium from being decrypted when judged in the affirmative.

Abstract: A content of Copy Once cannot be copied to an external device or the like, even for the purpose of making a backup. This is inconvenient for the user. However, if copying to another device for the purpose of making a backup is permitted, the content may be copied in an unauthorized manner. The present invention provides the hard disk recorder that transmits the content to the backup device, sets an expiration time in the content stored in the hard disk recorder itself, and deletes the content stored in the hard disk recorder itself after the expiration time expires.

Abstract: A theft prevention system capable of preventing theft of a target object by disabling the authorized key of the target object in the case where the authorized key has been stolen. When the authorized key is lost, a mobile telephone instructs a vehicle control device to set a warning mode. On receipt of this warning mode instruction, the vehicle control device sets warning mode, generates an electronic key, and transmits the generated electronic key to the mobile telephone, which receives and stores the electronic key. Once the warning mode is set in the vehicle, locking and unlocking are only possible using the electronic key. If the authorized key is found, the mobile telephone instructs the vehicle control device to set the normal mode. Upon receipt of this normal mode instruction, the vehicle control device sets the normal mode in the vehicle.