Im getting hammered by m160.cs.uwaterloo.ca which shows as
(compatible; http; +http://web.idrc.ca/challenge/ev-136691-201-1-DO_TOPIC.html; tangyang9@gmail.com)"
it seems to follow robots but i cant find much information on this and whether it needs blocking or not. From what that link says they are taking your content and supplying to the end user without any credit back to you. They even talk about braille so clearly its an offline thing.