Forum Moderators: not2easy
In the US, I believe that you just need to fill out a form, put the contents of site on a CD, pay a fee, and mail all this off to the copyright office. Check their site.
You do have some protection without doing that, and only need proof of when you first put the material online, but registering gives you added protections and the option of suing for statutory damages if someone infringes.
It should crawl your site automatically but you can submit your site at this link, [alexa.com...]
Keep your logs (that's your Date Certain for Production - legal term) and use those if you need to. Should push come to shove require Google to give up their First Listing of either site. You first, you win...
Meanwhile, you keep eyes and ears open and slam offenders with a DCMA whenever you locate theft/conversion. Works great.