Captcha - which asks users to type in words to prove they are not robots trying to cheat the system - is used on many sites.

BBC: Ticketmaster dumps 'hated' Captcha verification system

The type-In was born out of the mundane CAPTCHA process (the squiggly and obscured words one types in to verify that you are human).

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Sanjay Sehgal thinks the average CAPTCHA, that collection of deformed characters that Web sites ask users to type out when registering for an account, is both too easy and too demanding.

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