Publishers have a choice between ancient style, static CAPTCHA security that is easily broken and frustrating to users OR NuCaptcha.
NuCaptcha Free is a free, simple to use, benefit for WordPress users.
NuCaptcha Free provides a complete video CAPTCHA solution with:
Add captchas to your contact forms, registration pages, comments, login and password reset forms. The NuCaptcha WordPress plugin is completely well-matched withBuddyPress and Contact Form 7.
For extra information please view the plugin page
See a NuCaptcha in action and learn out extra at: http://www.nucaptcha.com/