| 摘要 |
The present invention offers a file distribution system that can restrict the use of files within a certain limit. The system includes a file distribution server. The file distribution server 2 is set up so that it can be connected with user terminals via communication network 3. The server 2 consists of several units. The units included are: the file data memory 24 to store digital file data to distribute, the program memory 25 to store a computer program to manage and play back digital file data, and the transfer-processing unit 26 to transfer management/playback program and digital file data in response to the request from user terminals. The management/playback program carries out the following processes: making storage space on the user terminals to store digital file data, storing the distributed digital file data after converting it to divided-and-spread data group according to certain rules, restoring the stored converted-file data to original digital file data by re-converting the converted-file data according to the rules, and playing back the restored digital file data.
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