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en.wikipedia.org/wiki/CAPTCHA

A CAPTCHA is a type of challenge-response test used in computing to determine whether or .... For example, in one segment of a CAPTCHA, a letter might look like an “m.” Only when the whole word is taken into context does it become clear  ...

www.findexamples.com/5-examples-of-different-types-of-captchas

Sep 26, 2012 ... A CAPTCHA or a “Completely Automated Public Turing test to tell Computers and Humans Apart,” comes in several shapes, sizes and types.

www.captcha.net

For example, humans can read distorted text as the one shown below, but current ... The term CAPTCHA (for Completely Automated Public Turing Test To Tell ...

captcha.com/captcha-examples.html

Each Captcha image style supported by BotDetect is shown as a single Captcha example screenshot. BotDetect also provides an audio captcha alternative to ...

www.captcha.tv

In the captcha examples above, you will have noticed that this is maybe a strange way of implementing captcha, as first the user goes to a link that takes him to ...

www.captcha.tv/captcha-forms.html

How to implement Captcha forms, examples of forms with captcha, forms with captcha, captcha protected web pages,

ui-patterns.com/pattern/Captcha

The whole idea behind Captchas is to create a way to distinguish real human beings ... More examples of the Captcha pattern See all 13 example screenshots.

labs.abeautifulsite.net/simple-php-captcha

CAPTCHA Example. Usage. The following code will prepare a CAPTCHA image and keep the code in a session variable for later use: <?php session_start(); ...

www.google.com/recaptcha/api2/demo

Sample Form with ReCAPTCHA. First Name; Last Name; Email. Pick your favorite color: Red Green.