Abstract: In a system which attaches update information required to create a content key used for content encryption/decryption to encrypted content and transmits the encrypted content, there is used an authorized content verification method including a verification request step of, by a receiver, transmitting an authorization verification request including update information received from a transmitter, an update information check step of, by the transmitter, checking whether the update information included in the received authorization verification request is predetermined update information, a message-of-acceptance transmission step of creating a message of acceptance using the update information and an exchange key shared between the transmitter and the receiver and transmitting the message of acceptance if the update information matches the predetermined update information, and an authorized content determination step of, by the receiver, determining that content is authorized content on the basis of reception of

Abstract: To provide an audio-video data synchronization method whereby an increase in the amount of control message transmission can be suppressed and the video output can be prevented from being interrupted.

Abstract: A communication apparatus establishes a one-way data connection and a connection to a network in which messages are transferred in two ways, and includes: a one-way data connection status detecting unit which detects a connection validating request indicating a communication apparatus on a data reception side that data transmission, utilizing the one-way data connection, is possible and a connection invalidating request indicating that the data transmission is impossible, both of which are outputted from the communication apparatus on the data reception side; an apparatus address obtaining unit which obtains an apparatus address with a message via the network when a change from the connection invalidating request to the connection validating request is detected; an address holding unit which holds the apparatus address; and a message transmission continuing unit which responds to the message received via the network based on the apparatus address held by the address holding unit regardless of whether or not t

Abstract: In the case where (i) audio-video data is unidirectionally transmitted between any device, where (ii) control messages are bidirectionally transmitted between all of the devices, and where (iii) a connection between the devices for transmitting and receiving the audio-video data becomes valid when unidirectional transmission of audio reproduction capability information of the reception device from the data reception device to the data transmission device becomes available, the TV (31) includes the audio reproduction capability information of the AV amplifier (21) to the control message and transmits the control message to the DVD recorder (10) (30M3), and in the case where the DVD recorder (10) and the TV (31) are connected such that the audio-video data is unidirectionally transmitted from the DVD recorder (10) to the TV (31), and where the TV (31) and the AV amplifier (21) are connected such that the audio data is output from the TV (31) to the AV amplifier (21) through another network, the TV (31) does not

Abstract: In the case where (i) audio-video data is unidirectionally transmitted between any device, where (ii) control messages are bidirectionally transmitted between all of the devices, and where (iii) a connection between the devices for transmitting and receiving the audio-video data becomes valid when unidirectional transmission of audio reproduction capability information of the reception device from the data reception device to the data transmission device becomes available, the TV (31) includes the audio reproduction capability information of the AV amplifier (21) to the control message and transmits the control message to the DVD recorder (10) (30M3), and in the case where the DVD recorder (10) and the TV (31) are connected such that the audio-video data is unidirectionally transmitted from the DVD recorder (10) to the TV (31), and where the TV (31) and the AV amplifier (21) are connected such that the audio data is output from the TV (31) to the AV amplifier (21) through another network, the TV (31) does not

Abstract: To provide an audio-video data synchronization method whereby an increase in the amount of control message transmission can be suppressed and the video output can be prevented from being interrupted.

Abstract: The invention provides a control device and a controlled device capable of reducing a management burden on a manufacturer by means of an easy-to-use method. A TV is a control device which controls a DVD recorder, including: a device ID acquisition unit which requests the DVD recorder to transmit a device ID, and receives the device ID from the DVD recorder; a device ID determination unit which determines whether or not the device ID is an initial value; a device ID generation unit which generates a new device ID in the case where the device ID is determined to be the initial value; a device ID update unit which requests the DVD recorder to update to the new device ID; a device ID/attribute information storing unit which stores the new device ID as the device ID of the DVD recorder; and a connected device control unit which controls the DVD recorder by using the device ID stored in the device ID/attribute information storing unit.

Abstract: A communication apparatus (100) of the present invention establishes a one-way data connection and a connection to a network in which a message is transferred in two ways, and includes: a one-way data connection status detecting unit (101) which detects a connection validating request showing a communication apparatus on a data reception side that data transmission, utilizing the one-way data connection, is possible and a connection invalidating request showing that the data transmission is impossible, both of which are outputted from the communication apparatus on the data reception side; an apparatus address obtaining unit (102) which obtains an apparatus address with a message via the network when a change from the connection invalidating request to the connection validating request is detected; an address holding unit (104) which holds the apparatus address; and a message transmission continuing unit (105) which responds to the message received via the network based on the apparatus address held by the ad

Abstract: The invention provides a control device and a controlled device capable of reducing a management burden on a manufacturer by means of an easy-to-use method. A TV is a control device which controls a DVD recorder, including: a device ID acquisition unit which requests the DVD recorder to transmit a device ID, and receives the device ID from the DVD recorder; a device ID determination unit which determines whether or not the device ID is an initial value; a device ID generation unit which generates a new device ID in the case where the device ID is determined to be the initial value; a device ID update unit which requests the DVD recorder to update to the new device ID; a device ID/attribute information storing unit which stores the new device ID as the device ID of the DVD recorder; and a connected device control unit which controls the DVD recorder by using the device ID stored in the device ID/attribute information storing unit.

Abstract: In a system which attaches update information required to create a content key used for content encryption/decryption to encrypted content and transmits the encrypted content, there is used an authorized content verification method including a verification request step of, by a receiver, transmitting an authorization verification request including update information received from a transmitter, an update information check step of, by the transmitter, checking whether the update information included in the received authorization verification request is predetermined update information, a message-of-acceptance transmission step of creating a message of acceptance using the update information and an exchange key shared between the transmitter and the receiver and transmitting the message of acceptance if the update information matches the predetermined update information, and an authorized content determination step of, by the receiver, determining that content is authorized content on the basis of reception of

Abstract: The present invention provides a content distribution management device that manages content distribution for a receiver which is permitted to share a content stored in a transmitter. The content distribution management device is a content distribution management device that manages content distribution in the case where a transmitter distributes a content to a plurality of receivers, the content distribution management device including a registration information/counter changing unit (205) which sets, in a registration information/counter holding unit (203), a valid reception period which is a maximum length of time for which the receivers can receive the content, the receivers being permitted to share the content, and the registration information/counter changing unit (205) manages, in accordance with a status of distribution of the content from the transmitter, a length of time for which all the receivers permitted to share the content can receive the content.

Abstract: In a bus system in which a node identifier is allocated to each node, when a data file is transmitted from a transmission node 1 to a reception node 2, a control node 3 issues, to the node 1, a command including an identifier of the node 2 and a field value representing a number of data files to be transmitted to execute the data transfer, and in the case where the number of the data files is 1 or more, after the transmission of the data files of the number specified in the field is completed, the node 1 directs the node 2 to complete the transfer to thereby complete the data transfer, and in the case where the field value is 0, the transmission of the data files is continued, and thus an automatic disconnection mainly led by the data transmission node is adopted after the data transmission, which reduces issuance of commands to the minimum, attaining a high efficiency in processing.

Abstract: Disclosed is an apparatus for controlling synchronous display of data to be transmitted among a plurality of terminals interconnected over a communication line.