Is your website completely custom? If it was/is a template you are a bit more limited by what you can do. But you can make a DMCA claim if your content is unique and someone rips your content.
To add a bit of protection to your content you should use the following in the <head> section of all pages using the correct URL for each page:
<link rel="canonical" href="http://www.yourwebsite.com/" />
If your website is unique then also use the above code and start sending DMCA notices to all of the hosting providers who are hosting your ripped site.