关于背景信息,请参阅上的解释。 In Italy, the country where the photograph was taken, the copyright expires after a period of 20 years from its creation. Created in early 1920s, it was protected until early 1940s, when the image passed into the public domain.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
The Museum für Kunst und Gewerbe Hamburg has published fair use recommendations when using images in the public domain. They are based on the Europeana Public Domain Usage Guidelines, but there is no legal liability to comply to them. We recommend the following:
When you use a public domain work please credit the author or creator.
Please also credit the Museum für Kunst und Gewerbe Hamburg as the provider of the digital reproduction.
When you use or modify a public domain work you should not attribute the changes to the creator or the provider of the work.
You can link to the object as a source, otherwise we recommend the following citation:
Uploaded a work by {{Creator:Nicola Perscheid}} from {{Museum für Kunst und Gewerbe}}[https://sammlungonline.mkg-hamburg.de/en/object/Papst-Pius-XI-/P1976.857.959/mkg-e00136677] with UploadWizard