Installing Captcha

Ok I got another problem here. I am intending for Cumulus Clips to act as a video archive of sorts and since its not integrated into the primary part of my site People would have to create an account just to post a comment or rate. So what I was wondering is how hard would it be to install Captcha for commenting and rating the video.

I looking through the posts and noticed someone else had a similar idea as well.
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