are rights over things enforceable against all other persons. By contrast, contractual rights are rights enforceable against particular persons. Property rights may, however, arise from a contract; the two systems of rights overlap. In relation to the sale of land, for example, two sets of legal relationships exist alongside one another: the contractual right to sue for damages, and the property right exercisable over the land. More minor property rights may be created by contract, as in the case of easements, covenants, and equitable servitudes. A separate distinction is evident where the rights granted are insufficiently substantial to confer on the nonowner a definable interest or right in the thing. The clearest example of these rights is the license. In general, even if licenses are created by a binding contract, they do not give rise to property interests. Property rights and personal rights Property rights are also distinguished from personal rights. Practically all contemporary societies acknowledge this basic ontological and ethical distinction. In the past, groups lacking political power have often been disqualified from the benefits of property. In an extreme form, this has meant that people have become "objects" of property—legally "things" or chattels (see slavery.) More commonly, marginalized groups have been denied legal rights to own property. These include Jews in England and married women in Western societies until the late 19th century. The dividing line between personal rights and property rights is not always easy to draw. For instance, is one's reputation property that can be commercially exploited by affording property rights to it? The question of the proprietary character of personal rights is particularly relevant in the case of rights over human tissue, organs and other body parts. The rights of women to control their own body have been in some times and some places subordinated to other people's control over their fetus. For example, government intervention that controls the conditions of birthing by prohibiting or requiring caesarian sections. Whether and how a woman becomes pregnant or carries a pregnancy to term is also subject to laws mandating or forbidding abortion, or restricting access to birth control. A woman's right to control her body during pregnancy or possible pregnancy – what work she does, what food or substances she ingests, other activities she engages in – have also frequently been subject to restrictions by many other parties; in response, a number of countries have passed laws