Abstract: A key management device according to an embodiment is a key management device managing an application key for encrypting a communication in an application network including a plurality of applications. The key management device includes a hardware processor configured to function as a collection unit, a calculation unit, a determination unit, and a communication unit. The collection unit collects, using quantum key distribution (QKD), resource information indicating a resource of a link for which a link key is generated. The calculation unit calculates metric for a key relay route including the link on the basis of the resource information. The determination unit determines a key relay route from among a plurality of key relay routes on the basis of the metric. The communication unit uses the key relay route determined by the determination unit to send, to a destination, an application key encrypted with the link key.

Abstract: According to an embodiment, a quantum cryptography storage system includes a plurality of storage, a distribution control device, and a distribution device. The plurality of storage devices are connected via a communication network. The distribution control device determines a distribution mode of shares into which data is distributed, based on quantum key distribution network (QKDN) information. The generation device generates an encryption key and a decryption key by using a quantum key shared by using a QKDN. The distribution device distributes the data into the shares, based on the distribution mode. When receiving a share encrypted using the encryption key via the communication network, each of the plurality of storage devices that stores the shares in a distributed manner decrypts the share encrypted with the decryption key and stores a share decrypted.

Abstract: According to an embodiment, a tuner unit, a managing unit, a private code verifying unit, an application origin verifying unit, and a device operation command processing unit. The tuner unit is configured to perform a decoding process of a broadcast program and program related information from broadcasting waves. The managing unit is configured to store a private code on a device-by-device basis. The private code verifying unit is configured to verify whether the private code obtained from an information manipulation device matches with the stored private code. The application origin verifying unit is configured to determine whether first origin information that has been received matches with second origin information of the application being executed. The device operation command processing unit is configured to allow execution of the device operation command when the first origin information and the second origin information match and when the private codes match.

Abstract: According to an embodiment, a tuner unit, a managing unit, a private code verifying unit, an application origin verifying unit, and a device operation command processing unit. The tuner unit is configured to perform a decoding process of a broadcast program and program related information from broadcasting waves. The managing unit is configured to store a private code on a device-by-device basis. The private code verifying unit is configured to verify whether the private code obtained from an information manipulation device matches with the stored private code. The application origin verifying unit is configured to determine whether first origin information that has been received matches with second origin information of the application being executed. The device operation command processing unit is configured to allow execution of the device operation command when the first origin information and the second origin information match and when the private codes match.

Abstract: According to one embodiment, a content playback device includes a receiving module which receives a plurality of channels including content, a selection module which selects a desired channel from a plurality of channels, a playback module which plays back a content item included in the selected channel, and a creation module which creates a special clock based on a playback time of a content item for the selected channel.

Abstract: In one embodiment, there is provided a video processor that includes: an access module configured to access a Web site on internet; an analyzing module configured to analyze information about the Web site so as to calculate processing load for displaying the Web site; and a display controller configured to switch between a first display mode and a second display mode depending on the processing load, wherein only the Web site is displayed in the first display mode, and wherein both the Web site and a certain image are displayed together in the second display mode.

Abstract: According to one embodiment, a video-data reproduction apparatus is connected by a network to a sever that distributes moving-picture content in unit of programs. The apparatus has a browser and a monitor. The browser can reproduce moving-picture content in units of programs, each at a time on the entire screen of the monitor. The browser performs a process of switching the program being reproduced on the entire screen, to a program designated, in accordance with an instruction input at a remote controller while the apparatus remains in the full-screen reproduction mode.

Abstract: According to one embodiment, a content reproduction apparatus comprises a receiving module that receives, from a server via a network, a channel including a plurality of contents arranged along a time base so as to be distributable, a reproduction module that selectively reproduces the contents included in the received channel, and a control module that shows, when reproduction of a final content on the time base in the channel is completed, that reproduction of the final content is completed, wherein the reproduction module further reproduces, after it is shown that reproduction of the final content is completed, another content included in the channel.

Abstract: According to one embodiment, a content playback device includes a receiving module which receives a plurality of channels including content, a selection module which selects a desired channel from a plurality of channels, a playback module which plays back a content item included in the selected channel, and a creation module which creates a special clock based on a playback time of a content item for the selected channel.

Abstract: According to one embodiment, a video-data reproduction apparatus is connected by a network to a server that distributes moving-picture content in unit of programs. The apparatus has a browser and a monitor. The browser can reproduce moving-picture content in units of programs, each at a time on the entire screen of the monitor. The browser performs a process of switching the program being reproduced on the entire screen, to a program designated, in accordance with an instruction input at a remote controller while the apparatus remains in the full-screen reproduction mode.

Abstract: An intelligent digital television receiver for receiving a video signal, an audio signal and a digital data transmitted in a digital broadcast, and for executing an application based on the received digital data by itself or in connection with the received video and/or audio signal. The receiver has a controller for controlling executions of applications by generating events according to event start information bearing time information contained in a digital data stream as an object which comprises an element of the application and another controller for controlling executions of the application.