Captcha Version :

Captcha Features : Captcha ZDR is a powerfull captcha tool for protecting your web FORMS from annoying spammers. The script is written in PHP. "Captcha ZDR" offers several methods of captcha protection, string protection, calculation protection (sum and deduction), noise in image, string symbols with noise are hard for reading (nearly impossible) from spamer machines. This php script offers 8 unique backgrounds for the captcha images.

Captcha Home Page : http://gscripts.net/free-php-scripts/Other/Captcha_ZDR/details.html

Captcha Tryout :

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