Ownership entitles owners to assign away some lesser property rights and retain other such rights. This chapter studies the cases for and against these lesser rights, called in this chapter “component” rights. Component rights may and should be limited when they help owners and the likely assignees of component rights use the resources more productively. The rights may and should be limited when they interfere with the clarity of property rights and when they interfere with opportunities of people who are not assignees to have sufficient access to resources. Property’s productive use requirement also justifies correlative doctrines between people who hold component rights in the same resource. This chapter studies leases, servitudes, security interests, present possessory estates, and future interests. To study limits on component rights, this chapter studies formalities requirements, standard terms of art for different component rights, the numerus clausus principle, the Rule Against Perpetuities, and the doctrine terminating servitudes for changed conditions. To study correlative rights, this chapter studies the doctrine of ameliorative waste.