The Constitution protects property rights, but they are not ‘sacrosanct’. Property rights can be restricted on the ground of public welfare. Real security rights are covered in this part. Although real property rights are to be created by statutes only, in reality, there have been cases where property rights were created by case law on the basis of commercial practice. The Civil Code lists ten kinds of real rights. In addition to ownership, there are four types of real rights which allow a person to use another’s property: superficies, emphyteusis, servitude, and commonage. There are four types of real security rights: rights of retention, preferential rights, pledge, and hypothec.