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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 ... captcha word solver, recaptcha captcha, example of captcha ... math solving captcha, math solution captcha, solve a math problem captcha, ...

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.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 ...

www.standards-schmandards.com/exhibits/captcha

This is a sample inaccessible registration form. The captcha test image is found below but there is also a link to an alternative test.

www.captcha.tv/captcha-forms.html

How about a fully working captcha form which actually sends off the information inserted by the user ? Before I show you this example, just a few observations on  ...

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.

www.google.com/recaptcha/api2/demo

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

textcaptcha.com

The TextCaptcha service provides access to textual CAPTCHA challenges via a simple ... curl http://api.textcaptcha.com/myemail@example.com.xml <captcha> ...

www.abeautifulsite.net/a-simple-php-captcha-script

Jan 16, 2011 ... This is one of the easiest CAPTCHA scripts you will ever use. While it doesn't ... A Simple PHP CAPTCHA Script ... Example CAPTCHA image:.