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Anti-spam / Captcha

I would like to know if there is any example for anti-spam or captcha in ssi that I can use at my surveys.
It is like the anti spam verification for asking question here.

Thanks in advance.
asked Oct 25 by anonymous

1 Answer

0 votes
Very easy solution.

1. Create a new text response item. Constrain it to numeric response.
2. Write the instruction: Please solve the math problem below.
3. Put an image (jpg, png, etc) of a simple math problem (e.g., 2+2)
answered Nov 10 by Corey1975 (340 points)
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