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It's pretty easy to prove that work is your own on the cheap by simply mailing your scripts to yourself and never opening them unless trouble brews. The envelope will be stamped with the date the post office received it - keep these envelopes in a safe place.
Anyhow, what I'd look at doing (if you don't want to spend money), pop it up online and look into the "Creative Commons" copyright:http://creativecommons.org/I haven't gone through it (I'm not a lawyer), but it'll likely hold up more than a mailer...