@inproceedings{P105.229, author={De Keukelaere, Frederik and DeMartini, Thomas and Bekaert, Jeroen and Van de Walle, Rik}, title={Supporting rights checking in an MPEG-21 Digital Item Processing environment}, booktitle={Proceedings of the IEEE International Conference on Multimedia & Expo}, year={2005}, month={7}, pages={4 pp op CD}, address={Amsterdam}, }