A digital video scrambling system with variable concealed levels incorporating viewing licenses. - Yusei Nishimoto; Satoshi Fujitsu; Hiroyuki Imaizumi; Nagahisa Mita (PIMRC, 2008)

Integrated Digital Rights Management for Mobile IPTV Using Broadcasting and Communications. - Yusei Nishimoto; Nagahisa Mita; Hiroyuki Imaizumi (IEEE Trans. Broadcast., 2009)