WARNING: concrete5 5.6 and earlier are end-of-life. Sales from the marketplace have now ended. Click here to learn more about this transition.
This addon replaces the system default CAPTCHA with Google's Invisible reCAPTCHA. You'll either see nothing or an "I'm not a robot" puzzle to solve.
You will need to generate a key pair which requires a Google account. Head over to https://www.google.com/recaptcha/admin#list to get started.