Confluence spaces, by default are visible to the general public, but require a logged in use in order to make changes. Confluence provides a few different ways to limit access to either an entire space or specific pages in a space.
Space-Level Permissions
In your Confluence Space, navigate to the tools icon 
on the left side of the screen.
Select Permissions on the top level navigation
Access to a space can be set for either a group or an individual.
Defaults
By default, all TUL staff who use Confluence are part of the confluence-users group.
Limit entire space to specific individuals
If you would like only specific users to be able to view and modify (the "Add" permission) content in a space, click Edit Permission, then click Select All next to the group name.
Anonymous Users
Access to a Confluence space by individuals who are not logged in is governed by this "Anonymous Access" at the bottom of the page. To remove anonymous access, click Edit Permissions and uncheck the permissions or click Select All.
