| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for enabling only a person who views content to obtain additional information. SOLUTION: First, information is buried in the content. Then, an instruction for extracting the information is made in linking with the content. A viewer extracts the information according to the instruction. Finally, the extracted information is used for accessing a web, or the like, thus enabling the viewer to obtain benefits. COPYRIGHT: (C)2005,JPO&NCIPI
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