| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To shorten a time required for the decoding of a data file necessary for the operation of a user by efficiently decoding the data file, and to shorten a time required for the decoding of the data file when the operation of the user ends by efficiently encrypting the data file. <P>SOLUTION: When receiving the execution request for prescribed processing, a computer is made to execute the reference of the file information of a data file corresponding to the use of the data file, the acquisition of the file information of the data files whose number is equivalent to the first rank number from the higher rank by prescribed ranking from among the file information of the data file used before the execution request, the reference of the encrypted file information showing the encryption of the data file, the judgement of whether or not the data file corresponding to the acquired file information has been encrypted and the decoding of the data file whose encryption has been judged. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
