Abstract: A user-friendly cooperative process execution method for causing household electric devices that are registered to a server to execute cooperative processes. The server stores correspondence information associating a particular operation to be executed by a particular household electric device with one or more groups each composed of one or more household electric devices, and indicating, for each of the household electric devices in each of the groups, a control signal to be transmitted to the household electric device. The method includes: detecting whether or not the particular operation is executed; selecting one of the groups that is composed of one or more household electric devices that are registered to the server by referring to the correspondence information when the execution of the particular operation is detected; and transmitting the control signal to each of the household electric devices in the selected group.

Abstract: A transmission device including: copy unit that extracts part or all of partial contents, as tracking information, from a content, and copies the extracted tracking information, thereby generating pieces of tracking information; candidate information obtaining unit that obtains pieces of candidate information respectively corresponding to the pieces of tracking information; evidence information obtaining unit that obtains evidence information generated dependently on a piece of candidate information selected by the reception device from among the pieces of candidate information; hash generating unit that generates hash values respectively in accordance with the pieces of candidate information; embed unit that embeds the hash values respectively into the pieces of tracking information, and embeds the evidence information into each piece of tracking information; and transmit unit that transmits each piece of tracking information in which a hash value and the evidence information have been embedded.

Abstract: A data processing device for playing back a digital work reduces the processing load involved in verification by using only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the data processing device improves the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: A control method includes: displaying candidate information on a user interface region of a display unit in an information terminal; obtaining, via a network, an operation history of each of apparatuses which indicates an operation performed on the corresponding apparatus; displaying, on the user interface region, a dialog for prompting a user to confirm whether or not to perform predetermined control on a target apparatus which is extracted according to at least one of (a) selected apparatus information (b) selected place information and (c) selected operator information, and has an operation history that satisfies a predetermined condition; generating a control signal for performing the predetermined control on the target apparatus, when the user confirms in the dialog that the predetermined control is to be performed on the target apparatus; and transmitting the control signal to the target apparatus via the network.

Abstract: The terminal device 600 comprises: a read unit configured to read encrypted content and a content signature from a regular region of a recording medium device 700, and to read a converted title key from an authorized region of the recording medium device 700, the converted title key having been converted from a title key with use of a content signature generated by an authorized signature device 500; a title key reconstruction unit configured to generate a reconstructed title key by reversely converting the converted title key with use of the content signature read by the read unit; and a playback unit configured to decrypt the encrypted content with use of the reconstructed title key to obtain decrypted content, and to play back the decrypted content.

Abstract: A control method is used in a remote control system including apparatuses and an information terminal that controls the apparatus(es) via a network. The control method includes: determining whether or not communication currently performed by the information terminal via the network is secure; displaying, for each apparatus, an icon for displaying control menus of a corresponding apparatus on a user interface region of a display unit in the information terminal in a display mode determined according to the determined security; displaying, on the user interface region, the control menus for controlling the corresponding apparatus, if the icon is selected; generating a control signal for causing the corresponding apparatus to perform an operation according to control corresponding to a first control menu, if the first control menu s selected from the displayed control menus; and transmitting the control signal to the corresponding apparatus via the network.

Abstract: Provided a terminal device having a network interface that forces network connection when not connected to a network. A terminal device 101a that has a network interface includes: a connection check unit 109a that makes a check as to whether the terminal device 101a is connected to a network; and an invalidation unit 115a that, when the connection check unit 109a judges that the terminal device 101a is not connected to the network as a result of the check, invalidates a function included in the terminal device 101a.

Abstract: A device classification method that includes: receiving a first action performed on a first device in the device group, for classifying the first device as belonging to the coordinated operation group; setting, when the first action is received, each of one or more devices in the device group other than the first device to a classifiable state in which the device is classifiable as belonging to the coordinated operation group; receiving a second action performed on a second device in the device group that is set to the classifiable state, for classifying the second device as belonging to the coordinated operation group; and classifying, when the second action is received, the first device and the second device as belonging to the coordinated operation group.

Abstract: The terminal device 600 comprises: a read unit configured to read encrypted content and a content signature from a regular region of a recording medium device 700, and to read a converted title key from an authorized region of the recording medium device 700, the converted title key having been converted from a title key with use of a content signature generated by an authorized signature device 500; a title key reconstruction unit configured to generate a reconstructed title key by reversely converting the converted title key with use of the content signature read by the read unit; and a playback unit configured to decrypt the encrypted content with use of the reconstructed title key to obtain decrypted content, and to play back the decrypted content.

Abstract: A sales device 100a includes: a first acquisition unit 108a acquiring a request for purchasing content from a user; a second acquisition unit 109a acquiring first identification information for a service, from a medium carrying the first identification information; a judgment unit 112a judging whether or not the request is received before a period during which the content is purchasable in a form of a packaged medium, and judging, by using the first identification information, whether or not the user is entitled to the service; an encryption unit 105a, when the request is received before the period and the user is entitled to the service, encrypting the content to generate encrypted content usable only on a terminal device that the user has; and a transmission unit 103a transmitting the encrypted content to the terminal device before the period.

Abstract: A game system in which game software produced to be used in stationary game machines can be used in portable game machines. The game system includes a stationary game machine, a portable game machine, and a memory card connectable to both the stationary and portable game machines. Image data contained in game software produced for the stationary game machine shows an image in the form of free-form surface. The stationary game machine converts the image data to show the image in the form of a polygon according to processing performance of the portable game machine, and stores the converted image data and a game program executable by the portable game machine onto the memory card. The portable game machine executes the game program stored on the memory card, and generates and displays a display image from the image data stored on the memory card.

Abstract: A data processing device for playing back a digital work reduces the processing load involved in verification by using only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the data processing device improves the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: In a system that centrally manages a terminal device group composed of a plurality of terminal devices in a home, a method allows for: determining an instruction to be transmitted to one of the terminal devices according to an operation status acquired from a different one of the terminal devices; specifying, from among the terminal devices, a terminal device as a transmission destination of the instruction, with use of pieces of connection source information specifying the respective terminal devices in a network, and acquisition times of the pieces of connection source information; and transmitting the instruction to the specified terminal device. Upon receiving the instruction, the specified terminal device performs an operation based on the received instruction. The operation is in coordination with the operation status acquired from the different terminal device.

Abstract: To provide a playback device capable of requesting for a content generated in a format compatible with its processing capability and playing back the content, with no need of user input of a user ID or the like. A playback device for playing back contents reads, from an external recording medium, a playback right of a content to play back one or more contents that each have been generated based on a content and in a format compatible with a processing capability different for each playback device, and transmits the playback right and capability information indicating a processing capability of the playback device to a server device. The playback device acquires, from the server device, one of the one or more contents corresponding to the playback right in a format compatible with its processing capability indicated by the capability information, and plays back the acquired content.

Abstract: A data processing device for playing back a digital work reduces the processing load involved in verification by using only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the data processing device improves the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: The management apparatus 105a manages copying of information from an original recording medium 101a to a copy recording medium 102a. The management apparatus 105a comprises: a transmission/reception unit 701a configured to receive an original-medium identifier from the copying apparatus 104a and to transmit permission information to the copying apparatus 104a, the original-medium identifier identifying the original recording medium, and the permission information indicating permission for the copying of the information; and a control unit 708a configured to determine whether to permit the copying of the information based on the received original-medium identifier and a registered original-medium identifier that identifies a registered original recording medium, and to allow the transmission/reception unit 701a to transmit the permission information when determining to permit the copying.

Abstract: A content distribution system for transferring contents between transmission device and reception device. The transmission device includes: key obtaining unit that obtains, from reception device, public keys and public key identifiers; watermark embedding unit that embeds a different public key identifier, as electronic watermark, into each of contents that are identical in substance; an encryption unit that encrypts contents using public keys to generate encrypted contents; and transmission unit that transmits encrypted contents to reception device. The reception device includes: key storage unit storing public keys, public key identifiers, and a private key that makes a pair with one of the public keys; key transmission unit that transmits public keys and public key identifiers to the transmission device; content receiving unit that receives encrypted contents from transmission device; and decryption unit that obtains a content from the received encrypted contents, using the private key.

Abstract: A terminal device 500 that is connected to a key distribution device 400 via a network, and in which a recording medium device 600 is mounted, the key distribution device 400 being for distributing a title key necessary for use of content, the recording medium device 600 being for storing therein the content and the title key. The recording medium device 600 and the key distribution device 400 perform mutual authentication and share shared keys that are identical to each other. The terminal device 500 comprises: a reception unit that receives an encrypted title key from the key distribution device 400, the encrypted title key being the title key encrypted with the shared key of the key distribution device 400; and a transfer unit 513 that transmits the encrypted title key to the recording medium device 600.

Abstract: A terminal device 102 includes a transmission/reception unit 306 that transmits, to a server device 101, information necessary for judgment as to whether to permit use of content. The server device 101 includes: a judgment unit 204 that judges whether to permit the terminal device 102 to use the content, based on terminal device management information set by a content provider, and the information necessary for the judgment and received from the terminal device 102; a notification data storage unit 203 that stores notifications to be presented to a user of the terminal device 102; and a transmission/reception unit 205 that transmits either information necessary for use of the content or one of the notifications according to a result of the judgment by the judgment unit 204.

Abstract: A data protection system includes terminals, and an encryption device that encrypts distribution data distributed to each terminal. Each terminal corresponds with one node on a lowest level of a tree structure having hierarchies. A data protection system excludes nodes on the lowest level, determines a plurality of combination patterns that include combinations of two or more of all four nodes that are reached one level below the node, decides an individual decryption key for each determined combination pattern, and decides an individual decryption key for each node on the lowest level. The data protection system prescribes nodes that are reached from the node on the lowest level and a terminal to the node on the highest level that is an invalid node.