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captcha protection
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Captcha Bank is a anti-spam captcha plugin for WordPress forms that adds secure image captcha or math captcha to prevent spam.
WordPress
CH Captcha use for Add captcha to WordPress on contact form 7.
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Stop spam bots from registering, logging in, filling out contact forms and commenting on your site without using annoying Captcha codes or puzzles.
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WP reCaptcha authenticate the visitor is a human verifying by Google ReCaptcha