The purpose of this paper is to suggest a rethinking of the common-versus-private framing of the property rights issue in the Commons Movement. The underlying normative principle we will use is simply the basic juridical principle that people should be legally responsible for the (positive and negative) results of their actions, i.e., that legal or de jure responsibility should be imputed in accordance with de facto responsibility. In the context of property rights, the responsibility principle is the old idea that property should be founded on people getting the (positive or negative) fruits of their labor, which is variously called the labor or natural rights theory of property.