Some Categories in Doc5 are protected for the use of the system only. This is to reduce confusion and help define what is part of the system and what is user generated content.
For example, when a new user creates themselves an account, a page in the User category is automatically created. In order to make sure these are available, “Users” is a restricted category where pages cannot be manually created.
By default the Restricted Categories are,
Depending on the installation others may have been added and should be defined here.