Protesters carrying a banner reading "Civil Marco yes, no surveillance" and wearing masks of ex-CIA agent, American Edward Snowden, are seen during the opening of the Multisectoral Global Conference on the Future of Internet Governance (NetMundial) which was attended by Brazil_s President, Dilma Rousseff, at the Grand Hyatt Hotel, south zone of Sao Paulo, southeastern Brazil, on April 23, 2014. Photo by: SERGIO CASTRO/picture-alliance/dpa/AP Images