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What is this?
It is a common technique used to prevent automated spamming of forms by
computer programs. An image is displayed to every web site visitor who wishes
to submit this form. This image contains a string of characters that the web
site visitor must type into the specified input box. If the string is correctly
reproduced, the form response will be processed as usual. Otherwise, another
CAPTCHA image will be generated and the visitor may try again until successful.
You can read more about this technique at
Wikipedia: CAPTCHA.
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