I know this is possible but cannot figure out how to do it. I would like users to only have access to wiki pages within particular cat1egories. I'd like to assign those categories to a user group — or if optionally — to individual users. Also, I'd like links going to content in a category the user cannot access to not appear as links (just regular text). I think this is sometimes called "see only what you can access"
I'd welcome your wisdom. Thanks!
Go to category => admin category, there you can assign permissions for a category to a user group (refered sometimes as jail category).