first, what I'm going to suggest will only work if your users reload the doc themselves - if it is reloaded by a Server, the users cannot be identified for additional SA_fields - the USER and ADMIN thing will work, but nothing else.
If that is ok (the users do reload themselves), there are additional possible fields to the SA which you can use to restrict the values of a certain field (e.g. >company<) that the users will be able to see - other values of that field (and all other values associated) will not be visible for them. Just look it up in the help_file.
1) you can assign document cal in the QMC (qlik management console), Documents tab, then choose the document (qvw) and at the rigth side choose Document Cal tab; then add your cal to the doc (bottom).
I suppose you don't have the Publisher.
If there isn't any section access your 5 users will get the same data (all data, no restrictions); to limit the visibility of certain records you have to add section access
2) for section access download the pdf (Introduction to Section Access) here
... and backup your qlik doc before you apply the section access