| 摘要 |
<p>PROBLEM TO BE SOLVED: To firmly ensure secrecy of block copy data. SOLUTION: The block copy data produced by a block copy producing device 1 of a block copy producing center A is encrypted by control means 1e, and is transmitted by communication means if through a data transmission circuit 2 to a seal manufacturing device 4 in a seal shop B. The seal manufacturing device 4 receives encrypted data from the block copy producing device 1, the received data is restored into the block copy data by control means 4e, and a seal is manufactured with the restored block copy data.</p> |
