In Moodle's DFwiki there are the possibility to manage the accessibility of the users.
So, we can erase privileges from the students inside of DFwiki. We can manage the following privileges:If it's checked, the student will be able to read and edit the wiki pages. Else the student only will be able to read. This let the student create new contents.
Upload files:If it's checked, the student will be able to upload files into DFwiki and they be there avaliables for all the users. Then everybody could include this files in theirs pages.
Attach files:If it's checked, the student will be able to attach files into wiki pages to give their own format with pictures or gaphics.
Restore old versions:If it's checked, the student will be able to restore the old versions of a wiki page.