Hong-heather Yu Peng Yin Samuel Cheng Xiangyang Kong Alex Gelman Robert S. Fish Smart Media: Empower Media with Active Data Hiding. 5-16 2001 conf/amt/2001 Active Media Technology http://link.springer.de/link/service/series/0558/bibs/2252/22520005.htm db/conf/amt/amt2001.html#YuYCKGF01