| http://www.w3.org/ns/prov#value | - 2.) The user reviews a collection of data sets which are available for license (which for purposes of this application, may be equated with a purchase) The user then selects a data set (e.g., a song or other content), and purchases (or otherwise obtains the right to receive) a copy of the data set. (The user may transmit purchase information, for example credit card information, using digital secu
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