Control user access to a folder

Hi everyone

I currently use ubuntu 10.10 which i have installed on a usb stick

I have an application installed under the directory /home/ubuntu/MyApplication

Inside the application folder there is a launch.sh script which launches the application. I have created a symbolic link on the desktop which calls /home/ubuntu/MyApplication/launch.sh that launches the application from the desktop

The usb stick will be shared between a number of users. I want the other users to be able to launch my application, but i don't want them to be able to view or copy the content of /home/ubuntu/MyApplication which contains application data

I set up a Private directory using ecryptfs-utils and i placed the content of /home/ubuntu/MyApplication inside the private directory

ecryptfs-setup-private

The problem i'm having is that after a restart when i log on and try to launch the application through the symbolic link on the desktop, i get a file not found error, because at this moment the Private directory is not mounted.

When i mount the Private directory than the content inside the Private directory becomes readable.

I want the users to be able to launch the application through the shortcut on the desktop but at the same time i want the content of the Private folder to remain encrypted(don't want them to copy, view or modify the files)

Any suggestions are more then welcome

Thanks,

El