| 摘要 |
PROBLEM TO BE SOLVED: To improve eagerness to bay to a user for charged contents, and to distribute data for trial listening in which the copyright of contents is protected to the user. SOLUTION: An information server 1 has a data storage means 12 for trial listening to store data 5 for trial listening generated by superposing and digitizing additional information to analog information including the same contents as charged contents so that the charged contents 4 can be trially listened to and the analog information is not completely played back in the same form. The data for trial listening can be downloaded from the information server to a user terminal 2 through a communication network 3. The charged contents can be also downloaded through the communication network similar to the case with the data for trial listening by providing the information server with a charged contents storage means 11 to store the charged contents. |
