This dialog asks user login and password for documents with protected access.
This dialog appears when you try to open a protected document. If such user name and password are not authorized to view the document, the document is not opened.
The Login dialog in Windows:
The Login dialog in Mac OS X:
User - the name (login) of the user.
Password - password.
Note: To protect the document and specify authorized users, use the Document Properties dialog, the Advanced tab.