Donghyun Choi Yunho Lee Hogab Kang Seungjoo Kim Dongho Won An Efficient and Secure Rights Sharing Method for DRM System Against Replay Attack. 135-145 2007 conf/atc/2007 ATC http://dx.doi.org/10.1007/978-3-540-73547-2_16 db/conf/atc/atc2007.html#ChoiLKKW07