Abstract: The information reproduction device for reproducing the contents information based on the license information added to the contents information and required for reproducing the contents information, includes a determining section for determining whether the encrypted contents information is the officially copied contents information or privately copied contents information based on the contents of the license information, and a reproduction section configured to reproduce the contents information determined as the privately copied contents information by the determining section under more severer restrictions than the officially copied contents information. Thus, the contents copied by the proper route (officially copied contents) can be distributed in a more advantageous form than the contents copied without proper authorization.

Abstract: A multimedia data management system comprises a search caption selector selecting one of a plurality of search captions having attributes, an inquiry expression generator generating an inquiry expression corresponding to the attribute added to the selected search caption, a database storing various media data and attributes thereof and searched by the inquiry expression, a converter converting the search result to a converted search result by adding a style to the search result, and a result output device displaying the converted search result based on the style added thereto.

Abstract: A method of producing advertisement information comprising producing event information for presenting advertisement during an execution of a program, reward data for supplying an additional function to the program and event identification information for identifying the reward data and the event information, outputting the event information and the event identification information which correspond to each other, and outputting the reward data and the event identification information which correspond to each other.

Abstract: A data input section inputs time series data changeable over the passage of time. An annotation input section inputs an annotation related to at least one of the time series data. A transformation section transforms the annotation according to a correlation between the annotation and the time series data. An output section outputs the transformed annotation combined with the time series data.

Abstract: A navigation communication system in which a plurality of clients access information stored in a server via a network, having a personal information control section provided in the server and controls the personal information of the users of the clients which access the same information and a personal information display section provided in the client and displays the personal information controlled by the personal information control section, a selector for selecting one of the personal information displayed, and a communication application section for communicating with a client corresponding to the selected personal information.