Sound + Vision. Italian broadcaster Mediaset has bought a “friendly” 10% stake in German TV company ProSiebenSat1. Mediaset is controlled by Silvio Berlusconi and is one of many TV companies trying to counteract the threat of Netflix. The two companies are already members of 12-member group the European Media Alliance with an audience over 200m. Vivendi, the French media company, holds a 30% stake in Mediaset but this stake has been frozen by Italian authorities while it considers media concentration.