detecting {HEAD ~ user access} of {TAIL ~ media content source} by using a computer, the media content source is stored in a computer readable storage medium 
of
detecting { HEAD ~ user access } of { TAIL ~ media content source } by using a computer , the media content source is stored in a computer readable storage medium
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH