The magsafe connector talks 1-wire, not the charger itself. It provides serial number and version info but no DRM/crypto. The Mac also uses the 1-wire to control the LEDs on the connector. See my teardown for the details: http://www.righto.com/2013/06/teardown-and-exploration-of-ma...
Nice, thanks.
What about magsafe2? same deal?
DELL also uses serial connection with the charger, with chip inside the charger. Kinda surprising Apple didnt lock it down like they are used to do.