18 Jul 2012
12 Feb 2009
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I don't believe that you can currently restrict based on the category of a module content item (at least not out-of-the-box)...
however you can restrict page access based on roles, though this feature is only available in the standard version (community version does not include workflow, and I believe only supports one user).
You can create roles and users under the Administration->Users page, and assign users to roles as you create them, or modify roles by accessing the user's profile. Once that's done, select the page (or page group) that you want to restrict and select the Permissions tab. Here you can define the roles (such as view, create, modify, approve, publish) for that specific page or pages. You can set multiple roles have different permissions, for example, Editors role can View, Create, Modify; Approvers role can do the same plus Approve; Publishers role can do the same plus Publish.
this is exactly how we do it here at our organization. works great! we have many departments, so setting role access to each section is tedious, but it is certainly possible!
I hope this was helpful!