We would like to be able to restrict access to a category so that it and all its subcategories and articles are only accessible by a group of internal users. Right now I cannot go to a category and set the permissions on it to, for example, only the "IT Team". Helpjuice and knowledgeowl can do this and it seems like pretty basic permissions functionality to be missing. I liken this to setting folder permissions in Windows which without would be a nightmare.