questions defined by the administrator(s)
* ReCaptcha - users have to identify a series of characters, either
visually or audially, from a widget provided by the reCAPTCHA service
+* Asirra - users have to identify the cats in a set of photos of cats
+and dogs, from a widget provided by the Microsoft Asirra service
== License ==
The reCAPTCHA module was written by Mike Crawford and Ben Maurer.
+The Asirra module was written by Bachsau.
+
Additional maintenance work was done by Yaron Koren.