| http://www.w3.org/ns/prov#value | - The advertisement value calculated according to the number of downloading (step 111) is provided for the advertiser, so that the advertiser can accurately evaluate his/her own advertising effect and determine whether or not the paid advertisement costs are reasonable (step 112). [0040] The advertisements such as sound, characters, image or dynamic image combined with MP3 files can be reproduced in
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