reCAPTCHA 私はロボットではありません
Stands for [b]Completely Automated Public Turing test to tell Computers and Humans Apart[/b]. 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":[https://en.wikipedia.org/wiki/CAPTCHA]
* "Wikipedia: reCAPTACHA":[https://en.wikipedia.org/wiki/reCAPTCHA]
captcha