Almost everyone who uses the Internet has been stopped at one time or another by a security feature called captcha, the wavy, distorted letters and numbers often found in a pixelated box that users are asked to type to prove they are human and not a piece of technology.

The text can sometimes be hard to decipher, and now some online publishers are getting ready to replace it with a new video advertising product from NuCaptcha, based in Vancouver, British Columbia.

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http://mediadecoder.blogs.nytimes.com/2010/10/25/nucaptcha-engage-puts-security-feature-in-a-video/