@inproceedings{P106.251, author={Poppe, Chris and Wolf, Ingo and Wischnowsky, Sven and De Zutter, Saar and Van de Walle, Rik}, title={Licensing system in an online MPEG-21 environment}, booktitle={Proceedings of the IADIS international conference WWW/internet 2006}, year={2006}, month={10}, volume={II}, pages={315-319}, editor={Isaias, P. and Nues, M. and Martinez, I.}, publisher={IADIS press}, address={Murcia}, }