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A CAPTCHA is a type of challenge-response test used in computing to determine whether or ..... Sometimes, if part of the software generating the CAPTCHA is client-side (the validation is done on a s...

The Official CAPTCHA Site


Includes demonstrations, research papers, and news.

Problems viewing or passing CAPTCHA verification | Yahoo Help ...


Learn what CAPTCHA is, and why Yahoo uses it to verify you're human.

The system always shows the error of "CAPTCHA verification failed ...


Nov 19, 2011 ... Question. The system always shows the error of "CAPTCHA verification failed" while the code is right. What is the problem? Solution. First of all ...

Adding CAPTCHA verification - EmailJS


Adding CAPTCHA verification. CAPTCHA images are used to make sure that a human is submitting the form, and it's a good way to prevent spam emails and ...

reCAPTCHA: Easy on Humans, Hard on Bots - Google


The new reCAPTCHA is here. A significant number of your users can now attest they are human without having to solve a CAPTCHA. Instead with just a single ...

reCAPTCHA Help - Google Help


Accessibility; This CAPTCHA is too hard; My computer is sending automated .... reCAPTCHA checkbox checked after successfully completing a verification ...

Captcha script for web forms - SnapHost.com


Captcha script. Free and paid HTML code for Captcha form-to-email scripts. Web forms with anti-spam protection, ready to be copied-and-pasted to your site.

CAPTCHA: Image Verification for Web Developers - HTML Goodies


The problem with most CAPTCHA image verification implementations is that they are so annoying that they often drive humans away. As we will show in this ...

Captcha Code — WordPress Plugins


Adds Captcha Code anti-spam methods to WordPress forms. Forms include comments form, registration form, lost passwordform and login form. In order to post ...

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Captcha Verification - Qualtrics Support


This Qualtrics support page teaches about the Captcha Verification question type , which asks survey respondents to verify that they are not robots.

What exactly is a CAPTCHA? How does it work? | Dictionary.com Blog


Oct 11, 2011 ... Websites use CAPTCHAs to keep spammers from posting on their sites. ... verification anymore and all is happy without the sad captcha tripe.

Form doesn't accept the captcha code| 123ContactForm Help


In some browsers, the captcha code (verification number) is not accepted, even though it's typed in correctly. Follow our guide to fix this problem.