The Internet’s battle against bots has been epic so far, and it just took another big step, with Invisible Captcha, a new version of captcha codes. At first the powers that be, came up with something called Captcha, a blockade made of obfuscated text, that could be read by humans, but gave bots a tough time. This was replaced by ReCatpcha, which followed the same concept as Captcha, but used actual texts from books, using the human answers for digitisation.
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