This is a file from the Wikimedia Commons. The description on its description page there is shown below.
The flag of Warsaw, with 8:5 aspect ratio. The top strip is RGB 255,223,0, and the bottom is RBG 240,20,10. Wikipedia does not have an article with this exact name. ...
David Benbennick made this flag, based on a PNG flag uploaded by User:Rfl. The colors are the same as Image:Herb Polski.png.
This image is ineligible for copyright. But just in case:
This image is in the public domain because according to the Polish Copyright Law Act of February 4, 1994 (Article 4, case 4) the "governmental symbols, documents, materials and signs are not subject to copyrights". Hence it is assumed that this image has been released into public domain. However in some instances the use of this image in Poland might be regulated by other laws.
I, the creator of this work, hereby release it into the public domain. This applies worldwide.
In case this is not legally possible, I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Warsaw (Polish: Warszawa, see also other names, in full The Capital City of Warsaw, Polish: Miasto StoÅeczne Warszawa) is the capital of Poland and its largest city. ... See also Flag of Poland Coat of Arms of Warsaw Coat of Arms of Poland Categories: Stub | Warsaw | Flags ...