{HEAD ~ The 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 file sharing networks 
gathers
{ HEAD ~ The 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 file sharing networks
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH