You don't need to register them officially. You already hold the copyright to it because your the person who created it. All registering does for you is allows you to prove it was yours first if you ever have to go to court. But if you have dated signed pieces, and pull the old mail it to yourself and never open it trick its just as good. If you are the original creator you already hold a copyright...in the U.S. at least...We just covered this in P.A.D. (principles of american democracy) yesterday...