| 摘要 |
<p>An information receiving device receives identification information and encrypted identification information and compares them so as to prevent unauthorized use of contents data. Contents data encrypted by a contents key and the contents key are recorded in a data storage device so as to enable another device to reproduce the contents data, thereby enhancing the versatility. A managing device manages the contents data in the data storage device so as to enable another device to use it. An information control device validates the signature of usable data so as to prevent unauthorized use of the contents data. The contents key and its handling policy, and the contents data encrypted by means of the contents key and contents use license condition information are stored in the data storage device so as to provide the contents data safely. An information recording device can select desired contents data and store it in the data storage device. An information receiving device can prevent use of contents data inhibited to provide and specified in a providing inhibition list.</p> |
