@incollection{JM07, author = {H. L. Jonker and S. Mauw}, title = {Core security requirements of {DRM} systems}, booktitle = {Digital Rights Management -- An Introduction}, editor = {D. Satish}, pages = {73--90}, publisher = {ICFAI University Press}, isbn = {81-314-0792-6}, prepint = {http://satoss.uni.lu/hugo/papers/core-secreqs-of-drm-chapter.pdf}, year = {2007} }