Brother Kogyo Kabushiki-kaisha

Xing Inc.

Yasushi Yanagihara

Hiroaki Suzuki

Hideki Matsuo

Kentaro Ushiyama

Yuji Kiyohara

Koichi Iijima

Hirotsugu Unotoro

Masahiro Kamei

To prevent a preview of contents by a person who does not have a right to view or listen, by distributing encoded contents data which are difficult for a third person to decode. A new participation terminal apparatus, as well as transmitting a participation request to a parent terminal apparatus of a connection destination candidate, transmits a participation disclosure key for encoding a contents decoding key. The parent terminal of the connection destination candidate which receives the participation disclosure key from the new participation terminal apparatus generates an encoded decoding key, which is a contents decoding key encoded using the participation disclosure key received, and transmits it to the new participation terminal apparatus. The new participation terminal apparatus decodes the encoded decoding key received, using a participation secret key stored in a participation key storage section, acquiring a contents decoding key. Using the contents decoding key, the new participation terminal apparatus decodes distributed encoded contents data, and carries out a reproduction process.

Contents distribution system, contents distribution method, terminal apparatus, and recording medium on which program thereof is recorded

A node device in a tree-type broadcast system having hierarchy levels of node devices while locating a broadcast device at its top, whereby information is sequentially transferred from a higher hierarchy level to a lower hierarchy level, the node device including:

Tree-type broadcast system, reconnection process method, node device, node process program, server device, and server process program

A tree type network system including an information delivery device, a plurality of node devices, and an administration, wherein the node devices are connected in a tree-like shape via a communication route while placing the information delivery device in an uppermost level and forming a plurality of hierarchy levels, and the delivery information is sequentially transferred from the node device in an upper hierarchy level to the node devices in lower hierarchy levels, wherein the administration device includes: a device for acquiring attribute information of a node device, which transmits participation request information, and determines device information on the basis of the attribute information thus acquired upon receipt of participation request information of requesting device information of node device as connection candidate, and a device for transmitting the connection end candidate information thus determined to the node device which transmits the participation request information.

Tree-type network system, node device, broadcast system, broadcast method, and the like

A broadcast device in a tree-type broadcast system forming plural hierarchy levels with the broadcast device located at the top and connecting the nodes so as to be sequentially transferred from higher to lower nodes, wherein the nodes select a first mode determining a reconnection destination by acquiring node information from a server or a second mode determining a reconnection destination by acquiring node information of the reconnection destination candidate, and determines the reconnection destination by acquiring the node information according to the mode currently selected when the higher nodes are disconnected and the node except for the own is reconnected, and the broadcast device monitors a load status of the server, and broadcasts to switch selection to the second mode to thereby enable sequential transfer of the switch instruction from the higher to the lower nodes when a monitor level becomes a threshold level or more.

Tree-type broadcast system, method of instructing mode switch, broadcast device, and broadcast process program

A content distribution system in which content is distributed from a broadcasting station via a plurality of nodes connected in a hierarchical tree structure, including: a base tree obtained by connecting the plurality of nodes in a hierarchical tree structure using the broadcasting station as an apex; an extension tree obtained by connecting the plurality of other nodes in a hierarchical tree structure using, as an apex, a first root node as any of the nodes included in the base tree; and a topology controller for controlling a topology of each of the nodes belonging to the base tree. The first root node controls the topology of each of the nodes belonging to the extension tree using the first root node as an apex.

Network system, information processor, and information processing program recording medium

A lost packet in a plurality of packets broadcasted from a broadcasting apparatus is detected. Packet complement request information indicative of a packet complement request for complementing the lost packet is transmitted to a device in a high hierarchical level, and a dummy packet for holding transmission of the packet complement request information for a predetermined hold time is transmitted in place of the lost packet to a node device connected in a low hierarchical level.

Tree-shaped broadcasting system, packet transmitting method, node device, and computer-readable medium

A node device having a plural hierarchy levels in a tree-like shape while placing a broadcast device at a top of the levels and connecting the node devices through a communication means, wherein content data is sequentially transferred from the node device at an upper hierarchy level to that at a lower hierarchy level, including:

Tree-type broadcast system, method of participating and withdrawing tree-type broadcast system, node device, and node process program

To provide a contents distribution system, method and the like, wherein even a node apparatus with a small storage capacity, such as in the case of a set-top box, can function as a root node apparatus in a P2P type of contents distribution system having a plurality of node apparatus disposed dispersed in a network by a DHT (Distributed Hash Table), or the like. A node apparatus includes a distribution source information storage section having a management information storage area storing first position information, which is position information of a management subject contents holding node apparatus holding contents data which are a subject of management, and an extension management information storage area storing second position information, which is position information of a node apparatus holding position information of the management subject contents holding node apparatus. Then, in the event that it is determined that a message received via a network is a request addressed to the node apparatus itself for a transmission of contents data distribution source information, the node apparatus selects the first position information or the second position information from the distribution source information storage section.

Contents distribution system, node apparatus and information processing method thereof, as well as recording medium on which program thereof is recorded

A separability control device formed by connecting plural node devices in a tree-like shape while forming plural hierarchy levels placing a delivery device at a top to enable content data from the delivery device to be sequentially transferred from the node device on an upper hierarchy level to the node device on an lower hierarchy level, including:

Separability control device, tree-type delivery system, node device separation control method, memory medium memorizing separability control program, memory medium memorizing information process program

In order that a loop does not occur when switching upstream terminal apparatus, to provide an information distribution system capable of preemptively detecting a distribution route loop, and avoiding the loop, a terminal apparatus and a program used in the same system, as well as a loop connection avoidance method. A terminal apparatus B which has received loop connection detection information from upstream determines whether or not a downstream terminal apparatus of a control path which is not a distribution route along which contents information is flowing, and a source of the loop connection detection information match and, in the event that they match, determines that a loop will occur. By this means, it is possible to determine in advance that a loop will occur, before switching an upstream connection destination. Also, substitute upstream terminal apparatus search information is transmitted in a downstream direction from terminal apparatus Band B, which are second nodes, and a terminal apparatus B which has received the substitute upstream terminal apparatus search information, but has not received the loop connection detection information, is made a substitute upstream apparatus. By switching to the substitute upstream apparatus, it is possible to avoid the loop.

Information distribution system, terminal apparatus used in such system, recording medium on which program is recorded, and loop connection avoidance method

A terminal apparatus in a contents distribution system stores previously connected terminal apparatus, correlated to a contents channel. Also, the terminal apparatus, in the event that an instruction to change a contents channel is issued, selects a terminal apparatus, from among the previously connected terminal apparatus, corresponding to the contents channel for which the change instruction has been issued, and requests of the selected terminal apparatus a connection destination candidate corresponding to the contents channel for which the change instruction has been issued. Then, the terminal apparatus selects the requested connection destination candidate corresponding to the contents channel, and notifies the terminal apparatus which has requested the connection destination candidate. Then, the terminal apparatus receives, and connects to, the reported connection destination candidate.

Growing community of inventors

Nagoya, Japan

Yasushi Yanagihara