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Tu, Shu-Fen, and Ching-Sheng Hsu. "A Joint Ownership Protection Scheme for Digital Images Based on Visual Cryptography." \i The International Arab Journal of Information Technology\i0  9, no. 3 (2012).\par \par Hsu, Ching-Sheng, and Shu-Fen Tu. \i Digital Watermarking Scheme with Visual Cryptography\i0  In \i International MultiConference of Engineers and Computer Scientists, IMECS 2008\i0 . Vol. I. Hong Kong, 2008.\par \par Tu, Shu-Fen, and Ching-Sheng Hsu. \i A VC-Based Copyright Protection Scheme for Digital Images of Multi-Authorship\i0  In \i World Congress on Engineering, WCE 2007\i0 . Vol. I. London, U.K., 2007.\par \par Tu, Shu-Fen, and Ching-Sheng Hsu. "A BTC-Based Watermarking Scheme for Digital Images." \i Information & Security: An International Journal\i0  15, no. 2 (2004): 216-228.\par \par }