I thought copyright was automatic? If you write it, it's under your copyright unless you specify it is public domain, right? And if you publish, your rights are now publicly "announced".
That's my understanding, anyway. I know in the United States, we can register our copyrights with the Library of Congress, but they don't grant the copyrights; they just register them, which gives the author some extra protection, but burden of clearing your ownership, if it's challenged, still falls on you, the author.