BERLIN — In a bellwether deal on one of the cutting edges of European TV, ZDF Studios has taken distribution worldwide on drama series “The Zweiflers,” produced by Turbokultur for ARD Degeto Film and Hessischer Rundfunk (HR). Created and showrun by David Hadda, the six-part series will premiere in Germany on ARD’s Mediathek streaming service in the spring and also be shown on Das Erste, ARD’s main linear channel, in the near future. In an age of spiraling costs and a large need to cut through a still immensely crowded market, Europe’s public broadcasters –ZDF Studios, not ZDF in this...