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Hidden CAPTCHA is an extension to the CAPTCHA module. It offers a hidden CAPTCHA (duh!)

The idea is very simple: If you offer an input box in any form, 99% of the time, robots will fill it with something before posting the form. If you offer an input box that has to stay empty, then the CAPTCHA system will prevent posts by robots.

This module allows you to add a Hidden CAPTCHA on forms where you don't absolutely need to have a human enter a text, number, etc. but that still needs a little anti-spam control.
How does it work?

This is just like any text CAPTCHA. You can set it up with a question specific to your website or that people just cannot answer in their right mind (i.e. How many stars are they in the Universe?) By changing the question regularly (once a month?) then you can prevent even more spam as the spammers need to adjust their robots to understand the new question (and some won't do that...) Long questions are better since they are not very likely to have been asked in any CAPTCHA before.

The CAPTCHA system will create a form with your question and an input box. The Hidden CAPTCHA system adds a specific CSS class to that form. The class references a CSS definition in the Hidden CAPTCHA file that says that the whole CAPTCHA box shall be hidden (i.e. display: none;).

The style is put in a separate file because it makes it a little harder for hackers to test whether the CAPTCHA is hidden or not. Imagine if you are using a random CAPTCHA...

Note that the form is definitively present on the page.

Free download from Shareware Connection - Hidden CAPTCHA is an extension to the CAPTCHA module

Publisher: AlexisWilke | License: Freeware | Price: 0.00
Version: 7.x-1.0 | Size: 10 KB | Platform: PHP, Scripts
Released Date: 06-04-2013 | Rating: 0 | Title: Hidden CAPTCHA

Author Url: http://drupal.org
Program Info Url: http://drupal.org
Download Url: http://ftp.drupal.org/files/projects/hidden_captcha-7.x-1.0.tar.gz

Hidden CAPTCHA keywords:
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Shareware Connection periodically updates pricing and software information of 'Hidden CAPTCHA' from company source 'AlexisWilke' , so some information may be slightly out-of-date. You should confirm all information before relying on it. Software piracy is theft,  Using 'Hidden CAPTCHA' crack, password, serial numbers, registration codes, key generators is illegal and prevent future development of Hidden CAPTCHA.

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