non-copyright restrictions symbol
by Lazur - uploaded on July 31, 2016, 2:02 pm
Like personality rights, insignia.
If you see a public domain flag at wikimedia commons, most certainly you will see a notification as the following:
"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."
Sticking anything to a country flag, deriving from a coat of arms and adding the fancy for decoration or any made up reason with no respect is not just offending the majority of the people -and considered douchebaggery- but most if not all cases it is against the law.
This symbol may depict a reminder of those restrictions which fell apart from the praised copyright restrictions.