| http://www.w3.org/ns/prov#value | - Apparatus, for use in an environment including a client device and an ad server, the apparatus comprising: a) an input for accepting document information, sourced from an application on the client device; b) means for determining at least one ad relevant to content of the document using at least the accepted document information; and c) means for sending the at least one ad determined to the clien
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