You are mistaking the Anne Frank Foundation (Dutch: Anne Frank Stichting), which maintains the Anne Frank House and monitors racism (specifically anti-semitism) in the Netherlands, with the Swiss Anne Frank Fonds, which holds the copyright to her diary. It is currently under discussion whether or not the Anne Frank Fonds actually holds the copyright, as it has been more than 70 years since the death of Anne Frank copyright should have expired, but the Anne Frank Fonds claims that Otto Frank (Anne's father) was a co-author of the book.