The first computer system later receives an encrypted response from the second computer system and processes the encrypted response to determine whether {HEAD ~ the second computer system} is authorized to access {TAIL ~ the software} 
is authorized to access
The first computer system later receives an encrypted response from the second computer system and processes the encrypted response to determine whether { HEAD ~ the second computer system } is authorized to access { TAIL ~ the software }
OTH OTH OTH 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 HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL