Are all CAPTCHA the same?

Posted by ggfan on Stack Overflow See other posts from Stack Overflow or by ggfan
Published on 2010-05-09T21:31:58Z Indexed on 2010/05/09 21:38 UTC
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I just downloaded and put an captcha test to my website. It's a free version and it does seem to do the job right. Is there any major difference between a free one and a professional one?

Is there a recommended one I should use? That's free :)

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