I have to restrict, in my corporate lan networtk, the rights. I have mediawiki 1.13.2 and, by now, I can't upgrade it.
group1 (user1+user2+ .. +userk) read and write on all mediawiki
group2 ( user(k+1) .. userN ) read and write on a subset of documents inside the same mediawiki.
Are you trying to restrict read access, or just write access to certain things?
If you are trying to restrict read access, you should look at using a CMS, or another wiki that supports restricting read access in a fine grained manner.
If you are looking to restrict write access, you can do so by placing all of the pages into a namespace, and restrict that namespace to a group.
I'm not sure if you can easily restrict write access to documents...
V/r,
Ryan Lane