NuCaptcha has launched Engage, a video ad service based on the company's anti-spambot security platform.

NuCaptcha's brand of CAPTCHA technology combines video and other security technology to determine whether a system user is a machine or a human.

But unlike the indecipherable squiggles in other CAPTCHA systems, NuCaptchas are surprisingly legible and easy on the human eye. The videos each contain a simple image and a moving banner of text featuring colored letters that the user must then type into an entry field.

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http://mashable.com/2010/10/26/nucaptcha-engage/