| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an IC card reducing or increasing capacity of a file while maintaining security. <P>SOLUTION: The IC card having a memory storing one or more files has a capacity changing means for reducing or increasing the capacity of the file selected by specific capacity specified from the outside. The file has a free space storage part which stores its own free space, the capacity changing means has a master file change restriction means for changing the content of the free space storage part of a master file containing files based on the specific capacity and not permitting reduction of the capacity of the selected file by the capacity changing means when a value obtained by subtracting the specific capacity from the capacity of the selected file becomes less than the total capacity of the size of the files contained in the selected file when the capacity changing means reduces the capacity of the file. <P>COPYRIGHT: (C)2008,JPO&INPIT |
