The division between private and public space is very much political, just as perhaps more famously free contra paid time is. Public space is not owned by the

The division between private and public space is very much political, just as perhaps more famously free contra paid time is. Public space is not owned by the watchers (in most jurisdictions). Even if it was, ownership does not translate well to physical space. There are lots of things you're not allowed to do with a place you "own", including building there. Regarding permissions for surveillance, it's far from clear how such a contract works and what you even can be said to agree to. In some places, both parties in the conversation need to agree to recording a telephone conversation for example, and the same principle should hold true for email.