Finally, since copyright registration is considered prima facie evidence in a copyright suit, should someone steal your unregistered work and then register it under their own name, you could easily find yourself being sued for infringing your own work (it really happens and more often than you think). You may prevail in the end, but it will cost you a lot of money because, even if you file a counterclaim, you will be limited to statutory damages only (the actual demonstrable financial damages you suffered by the infringement -- not the lawsuit), and you'll be hard pressed to get any lawyer to work for you.

If all you needed was a timestamp, the poor man's mail to yourself method, or a simple notarized copy would be sufficient. But it's that prima facie thing -- plus the court rules -- that make registration so important.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.