I'm not sure about the legal implications either, but it would be interesting to know. From a totally different angle it might cause backlash from users if the

I'm not sure about the legal implications either, but it would be interesting to know. From a totally different angle it might cause backlash from users if they felt betrayed by an action not actually doing what they thought it would do. You'd have to balance the conflicting desires to be able to undo things and have actions do what they say they will do. Maybe a 'trash can' or 'archive' system is the way to go.