A number of important philosophical books and articles on the topic of human rights have appeared in recent years including James Nickel’s Making Sense of Human Rights , James Griffin’s On Human Rights , Charles R. Beitz’s The Idea of Human Rights , Martha Nussbaum’s Creating Capabilities , Allen Buchanan’s Heart of Human Rights , and John Tasioulas’s various articles and his planned monograph on human rights .
Readers of Ethics Etc might be interested in a paper of mine called “Human Rights as Fundamental Conditions for a Good Life,”  which appears in a forthcoming volume that Rowan Cruft, Massimo Renzo and I have edited called the Philosophical Foundations of Human Rights , and in which I defend what I take to be a new substantive account of human rights. A copy of the paper can be found here  and here is an abstract of the paper:
What grounds human rights? How do we determine that something is a genuine human right? In this paper, I offer a new answer: human beings have human rights to what I call the fundamental conditions for pursuing a good life. These are certain goods, capacities and options that human beings qua human beings need whatever else they (qua individuals) might need in order to pursue a characteristically good human life. I call this the Fundamental Conditions Approach. Among other things, I explain how this way of grounding human rights is better than James Griffin’s Agency Approach and Martha Nussbaum’s Central Capabilities Approach, and I also show how it can be compatible with the increasingly popular Political Conceptions of human rights defended by John Rawls, Charles Beitz and Joseph Raz.