There's a nice feature on google drive that allows an application to store data not visible for users.
https://developers.google.com/drive/appdata
Is it possible to share this application data between users, just like other google drive files?
Larsi
To work with files from your Android or iOS device, download mobile apps for Google Drive and the Docs editors. Use the Drive mobile app to find and open files, share them, or do anything else you can do with Google Drive on a computer. Use the mobile Docs editors to edit documents, spreadsheets, and presentations.
Built in to Android is a backup service, similar to Apple's iCloud, that automatically backs up things like your device settings, Wi-Fi networks and app data to Google Drive. The service is free and doesn't count against storage in your Google Drive account.
Application data folder scope Before you can access the application data folder, you must request access to the https://www.googleapis.com/auth/drive.appdata scope. For more information about scopes and how to request access to them, refer to Authenticate your users.
You can't share appdata files within the Drive's existing permissions model. Appdata content is supposed to be exclusive to the application. If you try to change permissions for an appdata file, you'll receive a 403
with the following error message:
Method not supported for appdata contents
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