They claim certain reproduction rights there, but if this was a c. 1917 postcard, then it is out of copyright, and uncreative reproduction of a two-dimensional public domain work does not create any new intellectual property.
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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c. 1917 postcard of a residential street on Capitol Hill, Seattle, Washington Photographer: Unknown From the University of Washington Libraries Special Collections Division Seattle Photograph Collection Scanned from a postcard using a Microtek Sca