When I worked for the Post Office we were trained in the "Poor Man's Copyright". Whatever it is that you want to be copyrighted put it in a container (letter or package) send it by registered mail to yourself with a return receipt and leave it unopened. It has the date stamp on it and that will give you a date that YOU had it. It does stand up in court as long as it has not been tampered with.
Otherwise - I don't know.
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