I believed the diary of Anne Frank was absolutely real - until I read this. Geesh...sammieswife.
Meyer Levin died in 1981
Levin rewrote the various post-war treatments of the Anne Frank diary with an eye toward a Broadway production, but Otto decided to cut him out, refusing to honor his contract or pay him for his work. Meyer Levin sued Otto Frank for his writings, and the New York Supreme court awarded Meyer Levin $50,000, for his 'intellectual work'.
In 1980, Otto sued two Germans, Ernst Romer and Edgar Geiss, for distributing literature denouncing the diary as a forgery. The trial produced a study by official German handwriting experts that determined everything in the diary was written by the same person. The person that wrote the diaries had used a ballpoint pen throughout. Unfortunately for Herr Frank, the ballpoint pen was not available until 1951 whereas Anne was known to have died of typhus in 1944.
Because of the lawsuit in a German court, theGerman state forensic bureau, the Bundes Kriminal Amt [BKA]forensically examined the manuscript, which at that point in time consisted of three hardbound notebooks and 324 loose pages bound in a fourth notebook, with special forensic equipment.
The results of tests, performed at the BKA laboratories, showed that “significant” portions of the work, especially the fourth volume, were written with a ballpoint pen. Since ballpoint pens were not available before 1951, the BKA concluded those sections must have been added subsequently.
In the end, BKA clearly determined that none of the diary handwriting matched known examples of Anne's handwriting. The German magazine, Der Spiegel, published an account of this report alleging that (a) some editing postdated 1951; (b) an earlier expert had held that all the writing in the journal was by the same hand; and thus (c) the entire diary was a postwar fake.
The BKA information, at the urgent request of the Jewish community, was redacted at the time but later inadvertently released to researchers in the United States.