ACM - affordances
Reihaneh Safavi-Naini
Nicholas Paul Sheppard
Takeyuki Uehara
Proceedings of the 4th ACM workshop on Digital rights management - DRM ’04
Peer-to-peer content protection
Digital rights management in a 3G mobile phone and beyond
Proxy signatures for delegating signing operation
Public-key and attribute certificate frameworks
Rights expression language
Digital item identification