Drupal 6 sign-up form anti-SPAM (secure CAPTCHA)

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Bids
27
Avg Bid (EUR)
173
Project Budget (EUR)
€30 - €250

Project Description:
We need something to prevent that there are so many SPAM-registrations on our drupal 6-website.
Perhaps something with a CAPTCHA? Other suggestions are always welcome :-).

The CAPTCHA-module has to be secure and reliable though and it has to be easy to keep up-to-date. So that installing the newest generation of CAPTCHA is easy to do.

Additional Project Description:
05/28/2013 at 15:21 IST
We need something to prevent that there are so many SPAM-registrations on our drupal 6-website.
Perhaps something with a CAPTCHA? Other suggestions are always welcome :-).

IMPORTANT: The CAPTCHA-module has to be secure and reliable though and it has to be easy to keep up-to-date. So that installing the newest generation of CAPTCHA is easy to do.
For example if after a year the CAPTCHA-module isn't blocking spammers anymore so we should be able to update it ourselves (you could maybe write easy instructions for us to do that).

Skills required:
Drupal, PHP
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