i Think you can use both authorization type DMS/NTFS with section access,
section access being used for row level data reduction, and DMS/NTFS for document level authorization..
have you seen this qlikview security video series...?
You can use either one. With DMS when you distribute a qvw the users ID is held in the .meta file and QVS uses that for authorization. If you use NTFS QVS uses that for authorization.
Section Access is authentication and QVS uses the ID in Section Access to see if you are able to open the qvw. It checks your NTName with what is in the access table.