Yes, you're claiming international law. Which international law(s) are you referring to?
I was referring to
Intelectual Property in general.
Graphics, code, ... created by modders are also considered "Intellectual Property" to my knowledge.
The music we have been given rights of usage by a befriended composer definitely is.
There is a lot to read about that topic and I must admit, that I have not read all of it.

But it is handled, clarified by international law.
Edit:
As I said, I am very willing to share my work as everybody can read in our forum
here.
But I get a little bit upset, if somebody tells me that I don't have the right to decide if I want to share or not because I generally have no rights at all for my work.
And I get even more upset, if somebody says "stealing" copyrighted work from people, that have been generous and given allowance of usage to us, is no problem.
Edit 2:
"Intelectual Property" can be shared of course and this is the normal case in this forum to my experience.
And if nothing else is explicitly said about work uploaded or linked here, I think it should be considered, that it is wanted to be shared.
But there is simply no legal way of forcing people to share their "Intelectual Property", if they don't want to.