EFFICIENT BAR-CODE WATERMARK SYSTEM TO PROTECT AGRICULTURAL PRODUCTS INFORMATION AND COPYRIGHT Lin Deng ,* 1 , Xiaoming Wen 2 1 China Patent Information Center, State Intellectual Property Office of P.R.China, Beijing, P. R. China, 100088 2 Shandong University Library , Jinan , Shandong Province, P. R. China, 250100 * Corresponding author, Address: Hui Zhong Bei Li 116-1-401, Chao Yang District, Beijing, P.R.China, 100012, Tel: +86-13439892596, Email: denglin1021@hotmail.com Abstract: In order to protect agricultural product information and copyright, this paper proposes an efficient bar-code watermark system with digital signature. The proposed system adopts digital signature to prevent a buyer from unauthorized copies and to prevent a seller from forged unauthorized copies. The proposed system also encodes the signature with bar-code and embeds the bar-code image into the original image. As long as the similarity of watermark extracts from the damaged image over a threshold, the signature can be fully recovered. It is a novel idea to bring the bar-code concept into watermark system to protect agricultural product information and copyright. Detailed simulation results show that the proposed system gets much better results than that with error correcting code scheme, and prove that the proposed system can protect agricultural product information and copyright effectively. Keywords: bar-code, digital signature, agricultural product, copyright protection 1. INTRODUCTION At the global level, significant progress has been made towards improved agricultural product safety and information (Fernando, et al. 2006; Clark, et al. 2005). Since then, world gross agricultural production has grown. In order to manage agricultural production effectively, many efforts have been made, such as the scheme (N., et al. 2008; Konde, et al. 2005; Anon, 2005) Please use the following format when citing this chapter: Deng, L. and Wen, X., 2009, in IFIP International Federation for Information Processing, Volume 295, Computer and Computing Technologies in Agriculture II, Volume 3, eds. D. Li, Z. Chunjiang, (Boston: Springer), pp. 1637–1645.