Zonghua Liu Guangqing Liu Byungwook Lee An Efficient Key Distribution Method Applying to OMA DRM 2.0 with Device Identifier. 3-7 2008 SNPD http://doi.ieeecomputersociety.org/10.1109/SNPD.2008.76 conf/snpd/2008 db/conf/snpd/snpd2008.html#LiuLL08