Patent ID: 6760840
Filing Date: 2004-07-06
Classification: G06F,G06Q

Abstract:
A file editing system, comprising:a file management server device for managing files, each file containing a plurality of block data and block identification information for each block data, the block data being enciphered in units of blocks, and the file management server device managing the files according to the block identification information for each block data; and at least one client device, which makes an access to the file management server device to obtain the block data belonging to a desired file managed by the file management server device, the client device including; deciphering means for deciphering the block data obtained from the file management server device, in units of blocks by using a prescribed decipher key; editing means for editing the desired file formed by the block data deciphered by the deciphering means, to obtain editing data indicating an editing made in the desired file; enciphering means for enciphering the editing data obtained by the editing means, in units of blocks by using a prescribed cipher key, to obtain enciphered editing data; and communication means for transmitting the enciphered editing data obtained by the enciphering means to the file management server device, such that the file management server device manages the desired file according to the enciphered editing data received from the client device.