Content-log analyzing system and data-communication controlling device

A routing device that routes content from a transmission device to a reception device, the routing device comprising:

• a receiving unit operable to receive content, additional information of the content, and a transmission target address specifying the reception device, from the transmission device, the additional information indicating, according to a property of the content, whether or not to log communication of the content when the content is transmitted from the routing device to the reception device;
• a routing unit operable to transmit the content to the reception device specified by the transmission target address;
• and
• a log information generating unit operable to generate log information indicating that the content has been routed from the transmission device to the reception device, and store the generated log information, when the additional information received by the receiving unit indicates to log the communication.

An analyzing device that analyzes log information generated by a routing device that routes content from a transmission device to a reception device, the analyzing device comprising:

• an analyzing condition storing unit operable to store an analyzing condition that serves as a criterion to judge whether the reception device is an unauthorized device, when log information generated by the routing device is analyzed;
• a log receiving unit operable to obtain, from the routing device, log information indicating that content has been routed from the transmission device to the reception device;
• and
• an analyzing unit operable to analyze the log information received by the log receiving unit, based upon the analyzing condition stored in the analyzing condition storing unit, to judge whether the reception device is an unauthorized device.

A content distributing system for transmitting content from a transmission device to a reception device via a routing device, the system comprising:

• the transmission device operable to transmit content, additional information of the content, and a transmission target address specifying the reception device, to the routing device, the additional information indicating, according to a property of the content, whether or not to log communication of the content when the content is transmitted from the routing device to the reception device;
• the routing device operable to receive the content, the additional information, and the transmission target address, and transmit the content to the reception device specified by the transmission target address, and when the additional information indicates to log the communication, generate log information indicating that the content has been routed from the transmission device to the reception device, and analyze the generated log information based upon an analyzing condition internally stored therein, to judge whether the reception device is an unauthorized device;
• and
• the reception device operable to receive the content transmitted from the routing device.

A content distributing method for use in a content distributing system for transmitting content from a transmission device to a reception device via a routing device, the method comprising:

• generating additional information of content according to a property of the content, the additional information indicating whether or not to log communication of the content when the content is transmitted from the routing device to the reception device, and transmitting the additional information, a transmission target address specifying the reception device, and the content, to the routing device;
• receiving the additional information, the transmission target address, and the content from the transmission device, and transmitting the content to the reception device specified by the transmission target address, and when the additional information indicates to log the communication, generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the log information;
• receiving the content transmitted from the routing device;
• and
• obtaining the log information from the routing device, and judging whether the reception device is an unauthorized device, based upon the obtained log information.

A content distributing program for use in a content distributing system for transmitting content from a transmission device to a reception device via a routing device, the program comprising:

• a transmitting operating of generating additional information of content according to a property of the content, the additional information indicating whether or not to log communication of the content when the content is transmitted from the routing device to the reception device, and transmitting the additional information, a transmission target address specifying the reception device, and the content, to the routing device;
• a routing operation of receiving the additional information, the transmission target address, and the content from the transmission device, and transmitting the content to the reception device specified by the transmission target address, and when the additional information indicates to log the communication, generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the log information;
• a receiving operation of receiving the content transmitted from the routing device;
• and
• an analyzing operation of obtaining the log information from the routing device, and judging whether the reception device is an unauthorized device, based upon the obtained log information.

A computer-readable recording medium on which a content distributing program is recorded for use in a content distributing system for transmitting content from a transmission device to a reception device via a routing device, the program comprising:

• a transmitting operation of generating additional information of content according to a property of the content, the additional information indicating whether or not to log communication of the content when the content is transmitted from the routing device to the reception device, and transmitting the additional information, a transmission target address specifying the reception device, and the content, to the routing device;
• a routing operation of receiving the additional information, the transmission target address, and the content from the transmission device, and transmitting the content to the reception device specified by the transmission target address, and when the additional information indicates to log the communication, generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the log information;
• a receiving operation of receiving the content transmitted from the routing device;
• and
• an analyzing operation of obtaining the log information from the routing device, and judging whether the reception device is an unauthorized device, based upon the obtained log information.

A routing method for use in a routing device that routes content from a transmission device to a reception device, the method comprising:

• receiving content, additional information of the content, and a transmission target address specifying the reception device, from the transmission device, the additional information indicating, according to a property of the content, whether or not to log communication of the content when the content is transmitted from the routing device to the reception device;
• transmitting the content to the reception device specified by the transmission target address;
• and
• generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the generated log information, when the additional information received by the receiving unit indicates to log the communication.

A routing program for use in a routing device that routes content from a transmission device to a reception device, the program comprising:

• a receiving operation of receiving content, additional information of the content, and a transmission target address specifying the reception device, from the transmission device, the additional information indicating, according to a property of the content, whether or not to log communication of the content when the content is transmitted from the routing device to the reception device;
• a routing operation of transmitting the content to the reception device specified by the transmission target address;
• and
• a log information generating operation of generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the generated log information, when the additional information received by the receiving unit indicates to log the communication.

A computer-readable recording medium on which a routing program is recorded for use in a routing device that routes content from a transmission device to a reception device, the program comprising:

• a receiving operation of receiving content, additional information of the content, and a transmission target address specifying the reception device, from the transmission device, the additional information indicating, according to a property of the content, whether or not to log communication of the content when the content is transmitted from the routing device to the reception device;
• a routing operation of transmitting the content to the reception device specified by the transmission target address;
• and
• a log information generating operation of generating log information indicating that the content has been routed from the transmission device to the reception device, and storing the generated log information, when the additional information received by the receiving unit indicates to log the communication.