@incollection{drm:coresecreqs, 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}, year = {2007}, url = {http://satoss.uni.lu/papers/JM07.pdf} }