| 摘要 |
A method for selecting advertisement spots. The method comprises certifying a digital document having a placeholder for at least one advertisement, identifying at least one characteristic indicative of appropriateness of the digital document, assigning an appropriateness score to the digital document according to the at least one characteristic and associating a digital certificate indicative of the appropriateness score with the digital document, wherein the digital certificate is used for associating an advertisement with the placeholder.
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