| 摘要 |
PROBLEM TO BE SOLVED: To provide a memory chip which has its small volume and large storage capacity and can record various quantities of information in response to each actual request. SOLUTION: A structure 10 of an optical recording medium includes a memory chip 20 and an antenna structure 22. The chip 20 records the information on the protection keys which are necessary for the manufacturers, distributors and users, and the information stored in the chip 20 can be transmitted to the external readers via the structure 22. |
