'a commons regime takes steps to protect the "resource" that the commons jointly manages/owns/cares for. More specifically the words "protecting the resource" means setting an absolute scale limit on its use. The commoners will set a scale of use for grazing a commons, or fishing a river, or taking water from an irrigation system. That is to say they set a maximum physically measured use - so many cows over the summer, so many gallons or water, so many fish per season. (NOT, so much $ worth of milk etc)