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4CAPTCHA is a free service that protects your site from spam and abuse by differentiating between human and automated access. It is a CAPTCHA system owned by 4tv STUDIOS that uses advanced risk analysis techniques and machine learning to tell humans and bots apart. The original version asked users to decipher hard to read text or match images.

4CAPTCHA is for All the type of humans.

4CAPTCHA is a free service from 4tv STUDIOS that helps protect websites from spam and abuse. A “CAPTCHA” is a turing test to tell human and bots apart. It is easy for humans to solve, but hard for “bots” and other malicious software to figure out. By adding 4CAPTCHA to a site, you can block automated software while helping your welcome users to enter with ease.