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Stands for Completely Automated Public Turing test to tell Computers and Humans Apart. The most popular one is reCAPTCHA, owned by Google. reCAPTCHA involves clicking on a box labeled "I'm not a robot". If the system needs more verification, it shows a picture divided into 16 squares; the user must click on all squares containing the displayed word.

h4. External links
* "Wikipedia: CAPTCHA":[en.wikipedia.org/wiki/CAPTCHA]
* "Wikipedia: reCAPTACHA":[en.wikipedia.org/wiki/reCAPTCHA]



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