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Early CAPTCHAs such as these, generated by the EZ-Gimpy program, were used on Yahoo!. However, technology was developed to read this type of CAPTCHA ...
en.wikipedia.org/wiki/CAPTCHA - Similar
Includes demonstrations, research papers, and news.
www.captcha.net/ - Similar
The reCAPTCHA project at Carnegie Mellon University offers a free, secure and easy to install CAPTCHA implementation. reCAPTCHA also channels the human ...
www.captcha.net/captchas/ - Similar
A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form ...
drupal.org/project/captcha - Similar
A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot. For example, humans can read distorted ...
recaptcha.net/captcha.html - Similar
A captcha system that uses successful decodings to helps digitise books for online use. Background, and details on how to incorporate into a site.
recaptcha.net/ - Similar
Protect your guestbook, feedback form, comment form and any other web form with free anti-spam service of verification urls.
www.protectwebform.com/ - Similar
This server provides CAPTCHA images and audio files you can use in html-forms. CAPTCHA images can prevent forms to be used by robots. ...
captchas.net/ - Similar
A W3C Working Group Note explaining how CAPTCHAs can present a major obstacle to users who have limited vision or a learning disability such as dyslexia.
www.w3.org/TR/turingtest/ - Similar
So I started my own based on the HN Captcha PHP class. To see a demo of this plugin just try to enter a comment on the main page (Okay, still in Spanish . ...
www.boriel.com/plugins/captcha-plugin/ - Similar
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