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What is this? reCAPTCHA is a CAPTCHA service that helps to digitize books, newspapers and old time radio shows. 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 text as the one shown below, but current computer programs can't. This prevents abuse from "bots," or automated programs usually written to generate spam.

A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.