It definitely requires a layered approach from the infrastructure to be able to do this. Having security privacy embedded into that design is really critical. Certainly in the Estonian model there is discussion around the use of blockchain as being a potential opportunity to enable that. Dr. Cavoukian has discussed the importance of having privacy by design embedded into that, and not assuming that would take place.
The other layer is also around the legislative framework and being able to enable that sharing, but again, it's very use case specific. I must stress that trust will underpin everything, and having a legitimate, purposeful, reasonable reason to do this data sharing is going to be absolutely critical. The implementation is really going to be about the standard people, process and technology in ensuring that you have that ongoing process to keep it working.