German Chancellor Angela Merkel (L) and Brazilian President Dilma Rousseff (C) visit the SAP exhibition booth at the CeBIT IT fair in Hannover of Germany, March 6, 2012. Germany's CeBIT, the world's leading expo for Information and Communication Technology (ICT) industry, focusing on the demanding task of establishing trust and security in the fast-growing digital world, opened here late Monday. [Xinhua]