| 摘要 |
PURPOSE:To attain the protection to secure the securacy of a picture by providing a means inhibiting the hard copy of contents of storage medium so long as a pass word inputted from a scanning section and a pass word registered in the storage medium are dissident. CONSTITUTION:A block 211 in a laser card is secured for a pass word. The position of the block is decided by a CRC (cyclic redundancy) of the pass word and a code conversion list is written therein. The code conversion list makes a random code list in forming the pass word block and writes the list in the block. Thus, identical lists are hardly generated. That is, in the absence of the said code conversion list, the recorded picture data has no meaning and it is almost impossible to find out the pass word block buried in the picture data blocks, then complete security is attained. |
