(Charles Krupa | The Associated Press) In this June 19 file photo, a router and internet switch are displayed in East Derry, N.H. Net neutrality traces back to an engineering maxim called the “end-to-end principle,” a self-regulating network that put control in the hands of end users rather than a central authority. Traditional cable-TV services, for instance, required special equipment and controlled what channels are shown on TV. With an end-to-end network like the internet, the types of equipment, apps, articles and video services permitted are limited only to imagination.