reCAPTCHA Verification 

Before reCAPTCHA verification will function, you must acquire a public and private key from recaptcha.net. This key is free, you simply must provide the domain that your forum is running on. Once you've acquired the keys, they must be entered in the fields, as pictured above.

Private Key - Acquired from recaptcha.net
Public Key - Acquired from recaptcha.net
Theme - There are three themes, at the time of this writing, for which the recaptcha form will display.

You can also leave the Public and Private keys blank then the default keys will be used. However, this is not recommended if there are multiple vBulletin installations on the same server. If you are leaving the keys blank, the screen will appear as follows:

User Contributed Notes: reCAPTCHA Verification Add a Comment