if two people make svg of the same flag the content can be wildly different while the appearance would be quite different.
Anyone can take a photo, for example, of my hand - and everyone who does will have a copyrighted photograph that they made ... unless they choose to release it to the public domain (at least in the US)
Your SVG rendition of the leaning tower of Pisa (a public location) can be copyrighted
Just like my rendition of it can be
But your rendition is not my rendition (unless one of us copied it from the other)
What you might actually be looking for is trademark law, though, and not copyright law - for example, the notice on any Coke product reads similar to (in part), "the dynamic ribbon device is trademarked by Coca-Cola Corporation