Yamaha Corporation

Shingo Umeshima

Yoshinobu Iwasaki

Masayuki Mizushima

Disclosed is a technique which prevents description offensive to public order and morals, included in an electronic mail, from meeting the eyes of a receiver. If an electronic mail message is included in a payload part of a data packet delivered from a communication interface-, a control sectionof a relay apparatus-determines whether a character string offensive to public order and morals is included in a body text part thereof. If the character string offensive to public order and morals is included therein, the control sectiongenerates hiding data by encoding the body text part in a mail body of the original electronic mail message. The control sectionoverwrites a hiding notification character string in the body text part in the original electronic mail message, generates a body text-hidden electronic mail message which describes the hiding data in a content body of a part different from the body text part, and transmits it to a terminal-

Relay apparatus, relay method and recording medium

Provided is a multicast distribution system which can perform a multicast distribution by selecting a communication path satisfying a communication feature required by a multicast group. A distribution source router (Rs) performs a multicast distribution to routers (Rto R) constituting a multicast group based on an application via a mesh virtual network connected to a plurality of routers. When the CPU load ratio and the multicast group communication feature exceed threshold values, the distribution source router updates the number of branches and the depth of the multicast tree which distributes a packet from the router and starts reconfiguration of the multicast tree. When reconfiguring the multicast tree, the distribution source router references a path feature of the mesh virtual network, selects a communication path having a sufficient path feature with a higher priority, and generates a routing table based on the multicast tree.

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Hamamatsu, Japan

Shingo Umeshima