IFC has picked up all North American rights to “La habitacion de Fermat” (Fermat’s Room) after its screening this week in the Tribeca Festival Discovery Section.The directorial debut from Spain’s Luis Piedrahita and Rodrigo Sopena is a shrinking-room thriller that has four mathematicians forced to solve number-crunching problems to save their lives. Pic’s cast includes Argentina’s Federico Luppi. The Spanish-language pic will be released this summer on IFC’s Festival Direct VOD platform, which cherry-picks fest titles. Preeming at last October’s Sitges Festival, “Room” took the Melies d’Argent at Portugal’s Fantasporto this year. Produced by Notro Films, part of Spain’s Vertice Group, it has now been sold to more than 20 territories.