3D CAD Drawing Watermarking Based on Three Components. - Ki-Ryong Kwon; Hey-Jung Chang; Gwang-Seok Jung; Kwang-Seok Moon; Suk Hwan Lee (ICIP, 2006)

3D GIS vector map watermarking using geometric distribution. - Hey-Jung Chang; Bong-Ju Jang; Suk Hwan Lee; Seung-Seob Park; Ki-Ryong Kwon (ICME, 2009)