The govern-cement wants the information on your customers. So, they demand your database. So, I would like a database that doesn't have any data in it.
And this is doable if you use something like cookies, or encrypted customer info in the emails. Thus, they have to send you their information (encoded) each time the wish to do business.
However, this fails because you have to ship them stuff. And to ship them stuff, you have to have their address. And, even if you don't have it, USPS still does.