Patent ID: 6691149
Filing Date: 2004-02-10
Classification: G06F,Y10S

Abstract:
A data communication system for distributing music data files between a server and a client removably connected to the server, comprising:a server for storing and transferring music data files, including: server storage means for storing music data files and a management data file corresponding to the stored music data files; server transfer means for transferring music data files and corresponding management data from the management data file between the server storage means and the client; and server control means for updating the management data file on the basis of the music data files and corresponding management data transferred with the client; a client for storing and transferring music data files with the server, including: client storage means for storing music data files transferred from the server and a move management file containing management data corresponding to the music data files transferred from the server; and client transfer means for transferring music data files and corresponding management data from the move management file between the client storage means and the server; and client control means for updating the move management file on the basis of the music data files and corresponding management data transferred with the client; the server control means determining whether music data files transferred from the client were previously stored and currently not stored in the server storage means on the basis of the corresponding management data transferred from the client and the management data file in the server storage means; and the server storage means storing music data files transferred from the client into their previous locations if the server control means determines the music data files were previously stored in the server storage means.