The new process to digitize books
The American scientist from the Carnegie Mellon University developed a new system of helping to digitize books at the same time as allowing web sites to prove that a user is a human rather than a piece of software.
The reCAPTCHA system is a variation on the widely used CAPTCHA method of verifying human users by asking them to type in distorted or otherwise obscured words or other sequences of characters.
The reCAPTCHA project is currently helping digitise books from the Internet Archive. In addition to plugins for for popular systems 
and languages including WordPress, phpBB, PHP, Perl and Ruby, the project also offers reCAPTCHA Mailhide, a way of concealing email addresses on even simple web pages.
CAPTCHA is an acronym - possibly back-formed - for Completely Automated Turing Test To Tell Computers and Humans Apart. CAPTCHAs are often used to ensure that only humans submit comments to web sites, sign up for accounts, vote in online polls, and perform other activities. reCAPTCHA is run by the original creators of CAPTCHA.
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