I'm attempting to allow a user to post topics in a single category only. So, each user that registered would get assigned their own category and only be able to post to that category, but still be able to view all of the other categories (just not edit them, not sure about comments yet). It looks like this http://wordpress.org/support/topic/3954 post was asking almost the same exact thing, but it's a bit dated and never got resolved. I'm thinking that upon user registration, a few new variables will be created which define the category the user can post to (changing permissions by user rather than by level, and in the other post something was mentioned about having some kind of table in php or modifying the database somehow), but I'm not really sure how to go about changing this. Thanks for any help.