Captcha by Ideal 3.0.0

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Multiple CAPTCHA Engine is a system plugin to produce and verify captcha images.

With this new version, you will get 4 different captcha systems (libraries):

1. SecurImage PHP library (requires GD image Library),
2. ReCAPTCHA (requires an API key from recaptcha.net);
3. MathGuard, simple but effective.
4. VouchSafe, a New Spam prevention approach. (only compatible with Contact Enhanced and iRecommend)

Important: This plugin ONLY works with Contact Enhanced , Ajax Recommend Ajax Contact and iRecommend.