www.makemkv.com

Hey, I purchased makemkv back in May for my linux box (Gentoo).
Great program btw.
before i could check out the vendor wanted to know what OS I was using
the store's question about my OS gave me reason to pause.
I've read on the board that you can use one key on two machines, just not at the same time.

my question: can i use one key on two seperate machines with different OSes? on the linux box and my mac?

I haven't tried because i dont want my key to get revoked or something

One key allows you to use MakeMKV on one computer at a time. There are no other restrictions - you can use multiple copies on one computer, you can have it installed on unlimited number of computers. The same key works for any OS and any version.