I don't mind CAPTCHA per se but this one seems to be surprisingly difficult. Oth... | Hacker News

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		honzzz on June 11, 2013 \| parent \| context \| favorite \| on: Instant Server - Click the button to get a virtual... I don't mind CAPTCHA per se but this one seems to be surprisingly difficult. Other that that - nice idea.

tg3 on June 11, 2013 [–]

It's reCAPTCHA, which is very popular and actually does some good (OCR help in digitizing bookz where machines fail).

http://www.google.com/recaptcha

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