Hello Michel,
Thanks for launching this discussion! I hope we can help you there!
I just wanted to point out that licensing, as such, cannot resolve fear of the unknown. Choosing a license based on fears and unverified assumptions does not seem like a good basis to start opening up government data.
So I think it's a good idea to be able to make a distinction and to drive the discussions where we can reach results. I haven't got much experience with government's databases and their opening up, but other organisations do. Have you got in touch?
Good luck!