The copyright however belongs to the Anne Frank Fonds , a Switzerland - based foundation of Basel which was the sole inheritor of Frank after his death in 1980 .
In his will , Otto Frank bequeathed the original manuscripts to the Netherlands Institute for War Documentation .
The copyright belongs to the Anne Frank Fonds , a Switzerland - based foundation of Basel which was the sole inheritor of Otto Frank after Otto Frank 's death in 1980 .
In his will , Otto Frank bequeathed the original manuscripts to the Netherlands Institute for War Documentation .