For those not in the know, the Poor Man's Copyright is the act of mailing a copy of your work to yourself in a sealed envelope. In transit, the envelope will be date stamped and once received by you, it will remain sealed forevermore, or until its opening is required as part of a copyright infringement lawsuit. The combination of being sealed and date stamped is supposed to act as presumptive evidence that your work supersedes all others, including your infringer, at a rate that’s easy on the credit card.