links - web security-captcha
The most popular use of CAPTCHAs these days,
is to display an image with text, for a human to
retype.
A computer program would not be able to read the text
in the image.
general
reCAPTCHA
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reCAPTCHA
http://recaptcha.net/
"Protect your site from abuse and help digitize books. Use our CAPTCHA on your site for free." Sign up for a key, download their library, and add to your form.
reCAPTCHA
: 2008
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ReCAPTCHA summary
http://en.wikipedia.org/wiki/CAPTCHA#Collateral_benefits
A way to put the typing of CAPTCHAs to useful work.
wikipedia
: 2007
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reCAPTCHA Wiki
http://wiki.recaptcha.net/
"An unofficial repository for hints, tips, information and documentation about reCAPTCHA." How to integrate reCAPTCHA; How to change reCAPTCHA colors; FAQ
Wiki
: Aug 2007