I have uploaded a new and relatively short book: Human Rights: An Evolutionary and Christian Perspective. This book is freely downloadable under the Creative Commons license as referenced on the copyright page. It replaces an article I published back in 2007, Natural and Inalienable Rights, which I came to consider very inadequate though not wrong in a direct sense. That old article is included as a chapter in the new book.
In summary, the book argues that rights have been unfolding in history as a result of human communities developing as part of the Body of Christ in this mortal realm. Rights have some sort of absolute sense only in this Christian context and I think some have suspected that something like this is true given the close relationship between Christian civilization in the West and the type of human rights found in the Declaration of Independence or the writings of John Locke.