Inherited rights to artwork

Factual Questions
1

My friend’s father was an artist (he’s dead), his paintings are collectable and sell for ~100k. My friend said whenever one of the paintings sells, he gets a percentage (don’t know how big) of the sale price, because he inherited his father’s estate (this is n the uk).

I didn’t know that an artist retained an interest in an artwork after it was sold. How long does this interest last ?

2

It may be something in the will, where paintings are sold from the estate because I’ve never heard of such a thing otherwise. How could you even track a private sale between strangers?

3

This is a thing in at least UK and Australia. Only applicable to sales using art auctions, involving museums, etc.

4

Thank you, that explains it.

5

Thereby answering that question! Good job, Folly!