| 摘要 |
<p>A server (1) generates delivery data obtained by adding distribution control information which designates the possibility/impossibility of data transfer, the necessity/unnecessity of encryption, the possibility/impossibility of server inquiry, and the like to contents data such as digital contents, an electronic ticket, or the like and delivers the delivery data to a mobile information terminal (2). The delivery data is stored in the mobile information terminal (2), and freely used by a service user. Although the delivery data can be backed up in another user information terminal, restoration and transfer of the delivery data are restricted according to the added distribution control information.</p> |
