These people are probably dissecting your web content to copy and put onto their own web sites.
66.34.204.26
The referrer is always something like:
http://www.keywordspy.com/...
You may want to block them.
Contact the network and ask them to stop.
C I Host CIHOST4 (NET-66-34-0-0-1)
66.34.0.0 - 66.34.255.255
CIHS PROPAGATION4 (NET-66-34-0-0-2)
66.34.0.0 - 66.34.255.254
If this is not illegal, it should be.