"University policies towards ownership of software have recently become quite controversial. In this paper, we present what is to our knowledge the first systematic study of such ownership. We rely in part on a unique, hand-curated database of university software patents. The combination of our quantitative and qualitative research yields a number of interesting results. First, software patents represent an important, and growing, component of university patent holdings. Second, the main determinant of university software patenting is not computer science-related R&D (or even overall R&D) but the university's overall tendency to seek patents on R&D outputs."