Patricia Akester's Technological Accommodation of Conflicts between Freedom of Expression and DRM: The First Empirical Assessment is available in the University of Cambridge Faculty of Law repository.
Here's an excerpt from the abstract:
When technological measures were under consideration in the mid 1990s two stark scenarios presented themselves: on the one hand, an ideal world where copyright owners could use DRM to make their works available under a host of different conditions in a way that responded to the diversity of consumer demand; on the other, a more bleak environment where all users of copyright material (and much non-copyright material) would be forced to obtain permission and pay to access material that previously would have been available to all. . . . Patricia Akester examines how these issues are working out in practice. Based on a series of interviews with key organisations and individuals, involved in the use of copyright material and the development and deployment of DRM, she provides a sober assessment of the current state of affairs.