These people are probably dissecting your web content to copy and put onto their own web sites.
The referrer is always something like:
You may want to block them.
Contact the network and ask them to stop.
C I Host CIHOST4 (NET-66-34-0-0-1)
188.8.131.52 - 184.108.40.206
CIHS PROPAGATION4 (NET-66-34-0-0-2)
220.127.116.11 - 18.104.22.168
If this is not illegal, it should be.