Ntt Docomo, Inc.

Riko Nagai

Takashi Kondo

Kazuya Anzawa

Makoto Hamatsu

Yoshiaki Maeda

Toshihiro Inomata

A content server, in transmitting content appended with redistribution restriction information to a communication terminal, determines whether communication terminalhas a redistribution restriction function on the basis of identification data contained in a user agent header contained in a HTTP message transmitted from communication terminal. When the determination is affirmative, content servertransmits to communication terminalthe content via the Internet, gateway server, and mobile packet communication network

Method and system for restricting content redistribution

Mobile terminal receives from a server a content, a sending time information which indicates the time of sending the content, and a time restriction information that indicates the time period when the content can be used. Mobile terminal correlates the content with the sending time information and the time restriction information, and stores them. Mobile terminal calculates the difference between the time of receiving the content and the sending time information. Mobile terminal correlates the difference with the content and stores them. Mobile terminal adds the difference to the current time kept by time keeping unit to obtain a usage determination reference time. Mobile terminal compares the usage determination reference time with the time restriction information to determine whether the mobile terminal can use the content or not.

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Ichikawa, Japan

Riko Nagai