The various departments of the Federal Commissioner for the Records of the State Security Service of the former German Democratic Republic (BStU) have been responsible for numerous publications detailing the process of historical appraisal of the German Democratic Republic, with a particular focus on its security service. They have also participated in large numbers of exhibitions, a majority of which dealt with the legacy of Stasi archival records. In 2015 a digital media library was created containing thematic dossiers as well as an ever-growing selection of chronologically-organized files, photos, audio and video clips from 1949-1990.