The aim, it seems, is to deliver one charger per device - say Iphone or Ipod - so that chargers from other Ianythings won't work with your particular Iwotsit.
Apple thinks this is a "good thing" because it reckons devices that are stolen won't be much good to the tea-leaf.
Anyone with any sense - that is, anyone not desiring that Apple makes more wonga - will see this as a daft idea that is anti-consumer.
As the New Scientist points out, its a kind of DRM for chargers.
Of course, anyone with any sense will avoid such a device like the plague.
Here's a link to the patent application. ยต