@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},
  year          = {2007}
}