Google acquires reCaptcha

I'm using reCaptcha on my website, and it's a very feature rich and easy to use captcha. and i just noticed that Google is accurring reCaptcha, they want to use it to index old books and newspapers which are difficult to read by computer.

What does that mean?

It means that whenver you enter the text version of the captcha you're seeing , you're actually also helping Google to convert books into text for free!

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