{HEAD ~ The present system} monitors distribution networks, logs pertinent network and distributor information, generates network statistics, gathers {TAIL ~ evidence} of content distribution, and notifies interested parties of the availability of content on Wide Area Networks 
gathers
{ HEAD ~ The present system } monitors distribution networks , logs pertinent network and distributor information , generates network statistics , gathers { TAIL ~ evidence } of content distribution , and notifies interested parties of the availability of content on Wide Area Networks
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