Attached Link: http://www10.americanexpress.com/sif/cda/page/0,1641,5926,00.asp

From the American Express Small Business Web Site: " Copyright myth The myth about the efficacy of protecting work by mailing yourself a sealed copy of the work is just that -- a myth. Mailing work to yourself does not provide protection because you could easily mail yourself empty envelopes and then open them and insert anything you want. Instead, you can protect yourself by having a notary public sign and date your work or by registering it with the copyright office."