Open Wiki
Anyone can read and write in this wiki without registering. Typically installed on the intranet.

Semi-open wiki
Only registered users can write here. Anyone can post comments.

Protected wiki
Anyone can read in this wiki, but only users who have registered in the wiki are allowed to write.

Private Wiki
Only members of the cluster can read and write in a private wiki. If you want to participate in a private wiki, the administrator / owner must activate you.