Very secretly. On a serious note, I wonder what would it mean to implement a patented algorithm (patented in US where it's possible) in a country where it's not

Very secretly. On a serious note, I wonder what would it mean to implement a patented algorithm (patented in US where it's possible) in a country where it's not possible to patent software, like anywhere in EU. I presume it would mean you couldn't sell your software in US and that's about it?