This image is in the public domain according to German copyright law because it is part of a statute, ordinance, official decree or judgment (official work) issued by a German authority or court ( Abs.1 UrhG).
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Second Ribentropp-Molotov Pact.28.09.1939. Map of Poland signed by Stalin an Ribentropp with new German-Soviet border. Author unknown. This is photo of document made in 1946 for Nurnberg Trial purposes ( German origin - defence of Ribentropp and Goring)