Install this free Captcha script on any page that requires a Submit button. The script will freeze the button. Your visitors answer a simple arithmetic question where the answer would only be a 2 digit answer.
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Install this free Captcha script onto any page visitors are required to click any Submit button. Visitors will need to answer a simple arithmetic question correctly before the frozen Submit button is released for the visitor to use it. If the answer is incorrect, the question is reset hence the visitor is required to re-answer a new question.