The funny thing about people concerned about copyright, is that they never know how it works.
You don't "wait for" copyright.
YOU ALREADY HAVE IT.
Copyright is this mysterious thing that "springs" into existance the moment you create something in a "persistant form." It can get complicated, but for the most part, copyright is created automatically upon creation. It requires contracts in order to give copyright to someone else (for instance, a corporation), but for your writing, it already exists.
It used to be that people thought you had to put the little C dealy thingee, but that's not even necessary. Copyright isn't something you "claim."
If you want me to cite case law, I will. But it's not worth it. As I said, people that are concerned about copyright really only show their lack of research on the subject, and if they won't put in the work to at least *read* about it before getting up-at-arms, then I'm not terribly excited about seeing their writing.