

I think you are trying to solve a legal issue using a technological solution. The issue isn’t where his connections are coming from, the issue is where he’s a resident. It’s probably related to taxes or some other legal thing.
No matter what sort of technology you apply, you ain’t solving the legal issue.
Also this length should be at most 25 years and 10-15 years is better. These 75+ year copyrights are total BS.