If someone takes the content of your hub and cuts and pastes it into a hub of their own you will find that hub pages has a automatic "duplicate content warning." This means that if anyone tries to copy your content on hub pages they will not be allowed to because the duplicate content warning will not allow that hub to be published.
Getting back to your original question about plagiarism, if a lazy blogger does try to copy your work onto a blog of theirs you will find that Google and the other search engines are able to identify this plagiarism and Google and other search engines wills simply quash there earnings and page views.
So try not to worry to much because there are some automatic defenses against plagiarism built into search engine software.
Also if you are worried that someone really has copied your content get in touch with Hub Pages Team and they may be able to advise. And you do also have to defend your work International Copy Right Laws where if you had the time, the funds and the vital legal knowledge you could take legal action against anyone who tries to copy your work. Though this action could cost you financially, the law is on your side and you could use this to protect your work.
I hope this information helps. Good luck here on hub pages. From Safiq Ali Patel.