If u don't have a publisher u need to provide the folder level security.
Below are the steps
Right click on qvw file (or folder if you want to store into a folder same typology of files) - Security then you chose an user, press Modify, Deny all to users that you want don't want to see that dashboard and Allow write, read, etc... to users allowed to see the dashboard.
If you don't have publisher, then assigning access at folder level will be the only solution for you as suggested by Sudhakar. I did the same with my application.
Add the user under security tab of your .QVW file. Make sure you add the user whenever you allocate the new license to any user on QMC. And if you have different domains under your active directory, make sure you choose appropriate domain for each user while adding that user under Security tab.
But this is a tedious job when you have hundreds of users. Adding each user on by one is a time consuming job.
