Thats true, a simple 'Hotlinking Protection' through your htaccess (in Apache) should do the job. If the page / image request does not comef from your site throw a custom 404 page on there. You can even post the copying company information and that they attempted to steal your pages...
You can try this tool I have:
http://www.youontop.com/web-tools/custom.php it will create a custom .htaccess for you (put the file in your root folder). You can then use this tool:
http://www.youontop.com/web-tools/index.php to run a request for any image on your site. It'll tell you if the protection works or not.
Hope this helps