Dec. 9 (Bloomberg) -- Symantec Corporation EMEA Security CTO Darren Argyle, Optimal Payments CEO Joel Leonoff, Docusign Chief Information Security Officer Tom Pageler, BlackBerry Vice President for Security Advisory Service, Enterprise and Government Solutions Sinisha Patkovic discuss cyber attacks and the impact of cyber security on global companies.They speak with Bloomberg’s European Technology Reporter Amy Thomson at the Bloomberg Enterprise Technology Summit in London. (Source: Bloomberg)