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Rheas, reCAPTCHA can't be hacked. Once their current CAPTCHA is bypassed, they simply update their algorityhm. Because it is a service, they can do that. You don't install their system on your PC, you simply embed their service.
That's why reCAPTCHA's change over time: now they use black spots on their captcha's. They also warp captcha's over time.
So generally, reCAPTCHA is a good system, but like any system they can be bypassed, but reCAPTCHA does a really good job. But like any CAPTCHA, they haven't got a 100% succes rate.
I used to use this account, but no longer.
