[drives fast]

from the same page you got that from it also say this:

Do I have to register with your office to be protected?
No. In general, registration is voluntary. Copyright exists from the moment the work is created. You will have to register, however, if you wish to bring a lawsuit for infringement of a U.S. work. See Circular 1, Copyright Basics, section ?Copyright Registration.?

so as I have said a couple times now....if I claim I have created something that you created but you do not put it on pager (copyrighted) I can claim that I created it a week before you and actually copyright it and you cannot do anything about it and I will actually be the one who can sue you for claiming it is yours.

these things are worded in such a way that can be confusing to many and many usually stop reading when they see what they think is the answer to their question. You have to keep reading because laws routinely contradict themselves and it is left up to the lawyers to argure it out.

if you don't register your work....you cannot complain if someone steals it and registers it as their own