The Security page allows you to configure several security aspects of Sublime.
The Anonymous Access section allows you to specify what kind of access non-Sublime users will have to the web interface. This applies to any user browsing to the Sublime web interface who does not log in - and is not a user you created in the User Management screen.
One thing to note about these options is that they can be overridden on a per-repository basis. When creating a new repository you have the option to specify what kind of access anonymous users should have. If you choose “None”, then no anonymous users will see that repository even if you have granted anonymous users “Full Browsing” on this screen.
This section allows you to specify who can create new repositories. If you select “Users and Administrators”, then any user will have the ability to create new repositories (not anonymous users however). If you select “Administrators Only”, then only administrators will be able to create new repositories.
How you configure this depends on the polices you want to enforce in your organization.

This section allows you to change how your users authenticate to Sublime and also Subversion.
Changing these settings will most likely require you to re-configure permissions for your existing repositories. If you have a large number of existing repositories you may want to avoid making this change.
With Subversion authentication, you create and manage your user accounts directly from the Sublime administration interface. When users access their repositories, they use the SVN protocol over port 3690.
When switching to Subversion authentication, you must enter the username and password for an administrator account. Once you make the change you will be required to log in with this new administrator account.
With LDAP or Active Directory authentication, you will use existing user accounts in your Active Directory or LDAP store. Users will log into Sublime and access their repositories using their existing domain username and password.
Note: If you want to use LDAP / Active Directory authentication, you must have Apache already configured correctly. Sublime will NOT configure this for you.
When switching to LDAP authentication you must provide the following information:

After you make this change you must log in using the same username you entered in the Your Username field.