Codeweavers, the creators of Crossover for Linux and OS X, do this. I emailed them about it around a year ago and they never bothered to reply back, even though

Codeweavers, the creators of Crossover for Linux and OS X, do this. I emailed them about it around a year ago and they never bothered to reply back, even though I've bought several licenses from them over the years. https://www.codeweavers.com/login/ https://www.codeweavers.com/login/