Video recordings of last year's conferences can be found here (German only):
Potsdam Conference for National CyberSecurity 2019
Potsdam Conference for National CyberSecurity 2018
Potsdam Conference for National CyberSecurity 2017
Potsdam Conference for National CyberSecurity 2016
Potsdam Conference for National CyberSecurity 2015
Potsdam Conference for National CyberSecurity 2014
Potsdam Conference for National CyberSecurity 2013