| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a television broadcast system, a digital video broadcast system, a television receiver with a built-in hard disk, and a video reproducing apparatus, wherein an advertisement is effectively displayed for proper target users so as to enhance the effect of the advertisement. <P>SOLUTION: An HDD of a server stores encrypted program data, decryption key data for decrypting the program data, and a plurality of kinds of advertisement data, The HDD of the television receiver records program data which are transmitted in advance. When the user instructs program reproduction, the television receiver requests the server to transmit the decryption key data required for decrypting the program data (S51). The server uses user information generated on the basis of a request history of the decryption key data (S52) to discriminate the adaptation of each of advertisement data to the user (S53), and transmits the advertisement data with high adaptation to the television receiver together with the program data (S55). <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
