[Zope] Read-only zope (not zope from a readonly Data.fs)

[Pericles Akritides]

Hi,

Is there a way to make zope run read-only(with whatever loss of functionality doing that implies)?
I don't mean to prevent it from trying to write to disk (demo storage, -r),
I mean to make it impossible to change persistent objects in the running Zope instance,
something like disabling their __setattr__ (since it is hooked by Persistent, right?)

Is something like this possible (by modifying ZODB source maybe?)

TIA