Eberhard Becker Willms Buhse Dirk Günnewig Niels Rump DRM as Interlocking Challenge for Different Scientific Disciplines: Introduction. 1-2 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2770&spage=1 2003 conf/drm/2003 Digital Rights Management db/conf/drm/drm2003.html#BeckerBGR03