I have noticed that automated bots always scrape and repost my blog posts on a variety of websites. I don't really care but something to keep in mind. No copyright notice will stop a script that can't understand them.
It’s probably a lot like the piracy problem — Don’t spend a lot of time fighting it because those people don’t pay, but secure the legal rights to your works well enough to fight anyone with more sinister plans than making just a copy or two.