Completely Automated Public Turing test to tell Computers and Humans Apart used in form validation to restrict access to humans only

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A potential CAPTCHA phishing attack against reCAPTCHA?

In reCAPTCHA's API (without plugin), the key part is <iframe src="http://www.google.com/recaptcha/api/noscript?k=your_public_key" height="300" width="500" ...