There is no really good way for protection.
The problem origin is, that you can not safely identify a unique user on the internet, especially if he/she wants to hide (doesn't allow cookies, uses untrackable proxies).
There are IP and/or cookie solutions, but none gives you safety against a computer expert or a hacker.
All you can do, to use implement suggested protections, including a badword filter (what Optical suggested).
Against automatic submission text-image, but 100% safe solution.
So there is no 100% protection, just can target this goal.
Best regards,
Webmaster33
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