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* reCAPTCHA depends on the CAPTCHA module.

* Some people have found that they also need to use jQuery Update module.

  https://drupal.org/project/jquery_update

3. Register for a public and private reCAPTCHA key at:

4. Input the keys into the reCAPTCHA settings. The rest of

   the settings should be fine as their defaults.

MAILHIDE INPUT FORMAT

---------------------

The reCAPTCHA module also comes with an input format to

protect email addresses. This, of course, is optional to

use and is only there if you want it. The following is how

you use that input filter:

1. Enable the reCAPTCHA Mailhide module:

       admin/modules

2. Head over to your text format settings:

       admin/config/content/formats

3. Edit your default input format and add the reCAPTCHA

   Mailhide filter.

4. Click on the Configure tab and put in a public and

   private Mailhide key obtained from:

       https://www.google.com/recaptcha/mailhide/apikey

5. Use the Rearrange tab to rearrange the weight of the

   filter depending on what filters already exist.  Make

   sure it is before the URL Filter.

Note: You will require the installation of the mcrypt

      PHP module in your web server for Mailhide to work:

         http://php.net/manual/en/ref.mcrypt.php

MULTI-DOMAIN SUPPORT

--------------------

Since reCAPTCHA uses API keys that are unique to each

domain, if you're using a multi-domain system using the

same database, the reCAPTCHA module won't work when

querying the reCAPTCHA web service.  If you put the

following into your sites/mysite/settings.php file for

each domain, it will override the API key values and make

it so multi-domain systems are capable.

  $conf = array(

    'recaptcha_public_key' =>  'my other public key',

    'recaptcha_private_key' =>  'my other private key',

  );

CUSTOM RECAPTCHA THEME

----------------------

You can create a custom reCAPTCHA theme widget by setting

the theme of the reCAPTCHA form to "custom" in the

reCAPTCHA administration page.  This will output a custom

form that is themeable through the theme function:

  theme_recaptcha_custom_widget().

If you don't implement this function, it is still quite

easily customizable through manipulating the CSS.

For more information on this, visit:

https://developers.google.com/recaptcha/docs/customization