In Part I, we explain several theories on why PAEs are beneficial or detrimental to the patent system. These theories outline distinct categories of patent holders who enforce their patents. Transforming the distinct categories into a coding scheme, we detail in Part II the methodology we used to generate the dataset. Part III provides descriptive statistics of 2010 and 2012 patent litigation. We discuss implications of the data, including points of disagreement between our data and the data of others, in Part IV. We also describe some areas of future study, many of which we are presently undertaking. Finally, we provide a brief conclusion.

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Co-authored with Jay Kesan and David Schwartz