(Developer and Platinum versions of the plugin)
Users can now prove they're human without having to solve a CAPTCHA. Instead, with just a single click, they'll confirm they are not a robot. reCAPTCHA replaces the plugin's original captcha module with Google reCAPTCHA, making the process easier and more intuitive.Documentation
Easy to activate
To activate the add-on, simply visit the plugin page through the menu option: "Settings/Calculated Fields Form", tick the checkbox: "CFF-reCAPTCHA", and press the "Update" button...
...the add-on includes a new section in the plugin settings for entering the website and the secret keys assigned by reCAPTCHA to your website and used to generate and verify the captcha respectively.