It's virtually impossible to regulate that one. We would need to have people trying to figure...or we would have to try to impose digital locks ourselves. I don't think libraries can possibly be doing that kind of thing. You can't follow a book out of a door and say you can only have it for five days. Imposing loan periods like that, depending on the institution you serve, may or may not be good. In some academic institutions a term loan is the norm, so you can have a bit of material for an entire term. I'm not quite sure where the five-day provision comes from.
On March 6th, 2012. See this statement in context.