NEW YORK — Newmarket Films has sealed a deal to acquire North American rights to Germany’s Oscar submission this year, helmer Oliver Hirschbiegel’s “Downfall.”Pic, which follows the final days of Adolf Hitler and the Third Reich, is based on the books “Inside Hitler’s Bunker” by Joachim Fest and “Until the Final Hour” by Traudl Junge and Melissa Muller. Bruno Ganz stars as Hitler, living out his final hours in a bunker below Berlin. Written and produced by Bernd Eichinger, pic also stars Alexandra Maria Lara as Hitler’s private secretary, Ulrich Matthes as Joseph Goebbels and Juliane Kohler as Eva Braun. Newmarket, headed by Chris Ball, William Tyrer and Bob Berney, bought “Downfall” from the Constantin Film, ARD Degato and EOS Prods. banners.