reCAPTCHA - Wikipedia
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Figure 2 from Research on Deep Learning Techniques in Breaking Text-Based Captchas and Designing Image-Based Captcha
File:Wikipedia CAPTCHA.jpg - Wikimedia Commons
Submissions/Wikicaptcha: a ReCAPTCHA-like solution for Wikisource - Wikimania 2012 in Washington, D.C.
BotDetect CAPTCHA Generator
File:Over 60 million CAPTCHAs are solved every day by people around the world. reCAPTCHA channels
Use of Recaptcha on the wiki · Issue #19 · openstreetmap/operations · GitHub
ReCAPTCHA - InstallGentoo Wiki
ReCAPTCHA.realm, Findthechomiks fanon Wiki
Luis Von Ahn, zazor, reCAPTCHA, CAPTCHA, pdf, Google, wikipedia, svg, trademark, blue
How to enable reCAPTCHA in MediaWiki
Validate form using Google reCaptcha in PHP, by Esinniobiwa Quareeb
Generating Keys for Google Recaptcha - osCommerce Wiki
reCAPTCHA Lets Your Users Register Easily (on WordPress, Joomla) While Digitizing Books and Blocking Spammers • Domain .ME blog
RECAPTCHA for translations
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