Hi again @mirkoelettronics,
We are going to be rolling out some more multi-user oriented features this year, starting with something that will allow you to share your dashboard with others without them being able to edit it, and ultimately building towards a more robust system of users / roles / permissions.
I'm not sure if we'll have any password protection in the app, but the idea is that an authorized user would have access to your dashboard via their account, but only with a 'viewer/read only' type mode. Their account would of course be password protected as are all user accounts. Would this satisfy your use case do you think?