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en.wikipedia.org/wiki/ReCAPTCHA

reCAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human ... It works with Project Gutenberg to digitize public domain material and uses methods quite different from reCAPTCHA. The reCAPTCHA program ...

www.captcha.net

A free, secure and accessible CAPTCHA implementation is available from the reCAPTCHA project. Easy to install plugins and controls are available for ...

www.cylab.cmu.edu/partners/success-stories/recaptcha.html

Now, von Ahn has taken CAPTCHA technology a step further with the CyLab- funded reCAPTCHA Project. Many CAPTCHAs in use today provide web users ...

techcrunch.com/2007/09/16/recaptcha-using-captchas-to-digitize-books

Sep 16, 2007 ... Captchas are well known for keeping automated spammers out and ... It's a project from the School of Computer Science at Carnegie Mellon.

www.cylab.cmu.edu/research/projects/2008/captcha-project.html

Abstract. The CAPTCHA Project. A CAPTCHA is a program that can generate and grade tests that: Most humans can pass. Current computer programs can't ...

www.news.com.au/technology/online/security/how-the-most-annoying-technology-online-is-helping-preserve-history/news-story/06291155772b71288e1142d3b327b020

Aug 24, 2016 ... We've all filled a CAPTCHA box, but did you know what you were really ... is using it as the cornerstone of its ambitious Google Books project, ...

www.google.com/recaptcha

reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site.

github.com/salesforce/pixel-captcha-project

pixel-captcha-project - It's a unicode based visual CAPTCHA scheme that can be solved with 2-4 mouse clicks.

www.drupal.org/project/captcha

Jun 9, 2004 ... The CAPTCHA module provides this feature to virtually any user facing web form on a Drupal site. ... 11 people starred this project. Posted by ...

freecode.com/tags/captcha

The captcha.php library is very user-friendly and extremely easy to integrate into existing forms, because of its simple API. It nevertheless sports many ...