The first computer system later receives {TAIL ~ 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 the software 
The first computer system later receives { TAIL ~ 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 the software
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH