| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To further improve the protection of content relating to a content protection method and device. <P>SOLUTION: The content protection method and device are disclosed. These content protection method and device improve the conventional system based on the related technology by facilitating the management of content from the viewpoints of time and space. This improvement is achieved by storing the encrypted content and corresponding decryption keys and annulling the decryption keys at proper time. The decryption keys may be periodically received to facilitate the protection of the content further so that many people can access to a network at different times. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
