 Von Hagens has maintained tight copyright control over pictures of his exhibits.Visitors were not allowed to take pictures, and press photographers were required to sign restrictive agreements permitting only a single publication in a defined context, followed by a return of the copyright to Von Hagens.Because of a similar agreement applied to sound bites (O-Töne, in German) a German press organization suggested that the press refrain from reporting about the exhibition in Munich in 2003.