This image from the Xrmap flag collection (source: flags-2.6-src.tar.bz2). The README file in that collection says of the SVG flags "We release them in the public domain".
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This work has been released into the public domain by its copyright holder, Xrmap. This applies worldwide. In some countries this may not be legally possible; if so: Xrmap grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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This image shows a flag, a coat of arms, a seal or some other official insignia. The use of such symbols is restricted in many countries. These restrictions are independent of the copyright status.
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This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years.
Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (70 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.