Liberty rights

Some philosophers and political scientists make a distinction between claim rights and liberty rights. A claim right is a right which entails responsibilities, duties, or obligations on other parties regarding the right-holder. In contrast, a liberty right is a right which does not entail obligations on other parties, but rather only freedom or permission for the right-holder. The distinction between these two senses of "rights" originates in American jurist Wesley Newcomb Hohfeld's analysis thereof in his seminal work Fundamental Legal Conceptions, As Applied in Judicial Reasoning and Other Legal Essays.

Liberty rights and claim rights are the inverse of one another: a person has a liberty right permitting him to do something only if there is no other person who has a claim right forbidding him from doing so; and likewise, if a person has a claim right against someone else, that other person's liberty is thus limited. This is because the deontic concepts of obligation and permission are De Morgan dual; a person is permitted to do all and only the things he is not obliged to refrain from, and obliged to do all and only the things he is not permitted to refrain from.

A person's liberty right to x consists in his freedom to do or have x, while a person's claim right to x consists in an obligation on others to allow or enable him to do or have x. For example, to assert a liberty right to free speech is to assert that you have permission to speak freely; that is, that you are not doing anything wrong by speaking freely. But that liberty right does not in itself entail that others are obligated to help you communicate the things you wish to say, or even that they would be wrong in preventing you from speaking freely. To say these things would be to assert a claim right to free speech; to assert that others are obliged to refrain (i.e. prohibited) from preventing you from speaking freely (that is, that it would be wrong for them to do so) or even perhaps obliged to aid your efforts at communication (that is, it would be wrong for them to refuse such aid). Conversely, such claim rights do not entail liberty rights; e.g. laws prohibiting vigilante justice (establishing a legal claim right to be free thereof) do not thereby condone or permit all the acts which such violent enforcement might otherwise have prevented.

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