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It's actually automatically protected by copyright law.
As soon as your document is fix in writing - if you save it on your computer or the piece of paper on your typewriter - it gains copyright protection.
You should affix a © to the document along with the year to provide notice of the copyright and accidental infringement.
For additional protection against accidental infringement and questions of authenticity you can register it with the US Copyright Office.
You can find them here: http://www.copyright.gov/eco/
You would use Form TX for a literary work.
After registration, you would affix a ® to your document.
You can also use confidentiality agreements, so the other parties agree to not even share the document with anyone or tell others about it.
That would gain additional contract protection for your work.
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