1 This is a Perl implementation of the reCAPTCHA API.
3 From the recaptcha.net web site:
5 reCAPTCHA improves the process of digitizing books by sending words that
6 cannot be read by computers to the Web in the form of CAPTCHAs for
7 humans to decipher. More specifically, each word that cannot be read
8 correctly by OCR is placed on an image and used as a CAPTCHA. This is
9 possible because most OCR programs alert you when a word cannot be read