00305nas a2200109   4500000000100000000000100001008004100002260003500043100001500078700002000093245008200113       2007                            d  cJuly 2 - 4, 2007aLondon, U.K.1 aShu-Fen Tu1 aChing-Sheng Hsu00aA VC-Based Copyright Protection Scheme for Digital Images of Multi-Authorship