'After Snowden' is a spellbinding look at the purpose of journalism, the NSA leaks revealed by Edward Snowden and the future of reporting. To read edited highlights of the lecture head to: http://digitalprojects.group.shef.ac.uk/aftersnowden.html

Guardian Editor-in-chief Alan Rusbridger answers a range of audience question on topics including ethics in reporting, protection for whistleblowers and self-regulation in journalism.