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TheCAPTCHA - a powerful php script to protect your site against spambots. Free and open-source. Easy to install

Picture of a postage stamp issued to commemorate his many works with Biblical and Jewish themes, including the opera "David."

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Paper by Rich Gossweiler, Maryam Kamvar, and Shumeet Baluja describing an investigation into a new type of CAPTCHA based on asking users to say which way up an ...

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A free open-source PHP CAPTCHA script for generating complex CAPTCHA images and audio files. Easy to integrate and customize.

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