The terms of service for coredemia is currently set so contributors retain nearly all rights to the content they post.

If you look at the bottom of stackoverflow.com you can read that all contributions to SO are licended under the http://creativecommons.org/licenses/by-sa/3.0/ with attribution.

This allows for the information on SO to be remixed and reused by the public.

This license allows for all of SO to be downloaded and analyzed by whoever takes the time an effort.

I believe davorak is suggesting that you license the users' contributions (discussions and questions) under a permissive license such as CC BY-SA [1].

[1]http://creativecommons.org/licenses/by-sa/3.0/

EDIT: please disregard my answer, read the davorak's comment