May 22 2009
There's lots of information on reCAPTCHA itself on their web site. reCAPTCHA is particularly good as it helps digitize books, so it's doing something useful as well as providing spam protection. That's partly why we chose to use this existing service rather than one of our own invention.
The new feature is available both as a board-wide setting in Edit Board Settings, and as a per-forum setting, so you can choose which class of users have to perform the reCAPTCHA check. We recommend you have it set to Guests, so that anyone who isn't logged in will have to perform the reCAPTCHA check when they try to post. This should vastly cut down on spammers.
We will be automatically enabling this option (just for Guests) on all boards on 29th of May 2009. If you don't want it to be enabled, simply change the setting to "Disabled" right now, and it won't be enabled on 29th. If you choose the setting you want now, you'll have it exactly as you want it and no changes will be made to the setting on 29th - it'll only be auto-enabled for Admins who haven't changed the setting at all.
I hope this explained the feature clearly. If there are any questions, fire away.
Dec 18 2015
why can't I reply in the forum??
Apr 19 2016
Oct 26 2016
Yes, but how do we recognize, because sometimes we publish unexpectedly stuff and is considered malicious.