How to make a Forum or Category private for some Groups?

If you want to allow only a set of users to access a determined Category or Forum, you have to setup the proper access rights for the Groups you want.

1. First, create a group to put users into
2. Then, go to Admin Panel -> Groups -> Permissions and set the access rights according to the following table:

If you want to ...	Then ...
... prevent a group of accessing some Category	... on the Category -> Restricted Categories section, select the Categories you want to restrict access for the current group
... prevent a group of accessing some *Forum*	... on the Forums -> Restricted Forums section, select the Forums you want to restrict access tot he current group

Please note that if you restrict a Category, all Forums related to the respective record will also have his access restricted to only allowed groups.