| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that an encryption release information is extracted from a datagram which is transmitted on a single signal line which connects two sets of equipments in an content data transmission/reception system, and an encrypted content datagram can be decoded using the encryption release information; and that a content detagram of original high quality can be obtained. <P>SOLUTION: In the content data transmission/reception system, a content data source enciphers a content datagram using keys information, and transmits the content datagram enciphered using the keys information to a content data reception device through two or more signal paths after transmitting the keys information to the content data reception device through a signal path. The content data reception device obtains the keys information transmitted through the signal path from the content data source, receives the enciphered content datagram which was transmitted through two or more signal paths from the content data source, and decodes the content datagram enciphered using the keys information. <P>COPYRIGHT: (C)2004,JPO</p> |
