Is there an Unobtrusive Captcha for web forms?

Posted by KP on Stack Overflow See other posts from Stack Overflow or by KP
Published on 2008-08-06T02:36:23Z Indexed on 2010/05/04 23:38 UTC
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What is the best unobtrusive CAPTCHA for web forms? One that does not involve a UI, rather a non-UI Turing test. I have seen a simple example of a non UI CAPTCHA like the Nobot control from Microsoft. I am looking for a CAPTCHA that does not ask the user any question in any form. No riddles, no what's in this image.

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