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View Resource CAPTCHA Project: Telling Humans and Computers Apart (Automatically)

Many online services are being inundated by new users that are not people at all, but rather computer programs designed to sign up for thousands of free email accounts, cast votes in online polls, or perform other automated tasks. Since there needs to be some way to tell whether a user is a human or one of these programs, computer scientists at Carnegie Mellon University initiated the CAPTCHA...

http://www.captcha.net/