FILE SHARING NETWORK SYSTEM, DATA STRUCTURE USED FOR FILE TRANSER OF FILE SHARING NETWORK SYSTEM, FILE TRANSFER METHOD FOR FILE SHARING NETWORK SYSTEM, FILE DISCLOSURE COMPUTER, CACHE COMPUTER, FILE ACQUISITION COMPUTER AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a new technical means for efficiently restoring a file. SOLUTION: The file sharing network system comprises a metadata generation part 12 for generating a plurality of metadata m1, m2, m3 and m4 encoded so as to be erasable or correctable from a shared original file F, and a metadata decoding part 53 for acquiring the metadata for acquiring the original file, and decoding the metadata to restore the original file. COPYRIGHT: (C)2008,JPO&INPIT