Jacob Kaufman discusses property law in J. R. R. Tolkien's Lord of the Rings in a post here on the blog Law is Cool. See also these follow up posts here at the Volokh Conspiracy.
[Thanks to Professor Troy Hinrichs, California Baptist University, for the cite].
Researchers might also be interested in:
Stoddard, William H., Law and Institutions in the Shire, 18 Mythlore 4-8 (Autumn 1992). This article is listed in my bibliography An International Guide to Law and Literature Studies (2000).