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