Optionally, only a portion of the sought digital content is downloaded using single source download, establishing that {HEAD ~ such a portion} of {TAIL ~ the sought content} is made available by the distributor 
of
Optionally , only a portion of the sought digital content is downloaded using single source download , establishing that { HEAD ~ such a portion } of { TAIL ~ the sought content } is made available by the distributor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH