If you enabled section access in your document and the user with admin rights is a different user than under which the Distribution Service is running on the server you can use this setting to specify the account that should be used to open and reload the document.
From the Server Reference Manual:
Data Protection
This setting allows you to select the username and password the Distribution Service should use when
opening this document.
The default configuration is for the QlikView Distribution service to use the Windows credentials that are
set for the service itself in the Windows Computer Management Console. Read more about section access