reCAPTCHA: A CAPTCHA for the Cool Kids
Looking for a free CAPTCHA? reCAPTCHA is a free CAPTCHA service offered by the smart folks at Carnegie Mellon. You can insert the code just about anywhere and they have plugins for WordPress and PHP to make it easy. There are also detailed instructions and examples for multiple languages and platforms.
I’ve used it on many ASP.NET sites already and it works like a champ.
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