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The Google reCAPTCHA service is a most popular of captcha services. A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.

This add-on does not remove the standard "captcha" add-on, and can work together with it.
The administrator can choose - where to use the Google recaptcha or default captcha(see screenshots).

Demo is here!