Could someone please help me understand my "rights" when it comes to using/owning MacOS? Here are two scenarios I am curious about... Scenario #1: Right now I have a dying 2012 MBP with Mountain Lion on it, and a new 2015 MBP with Sierra (and dust!) on it. And I am thinking of buying a another 2015 MBP that is refurbished. Because I am security minded, I would never use a "used" computer that came with an OS/Apps already on it. (With my luck, Senor Putin put it out on the market to track me!!) Scenario #2: I would love to buy a 2nd MBP that is brand new, but I have a majoy issue with soldered in SSD!!! In another thread, @macs4nw mentioned one solution to my aversion to soldered in SSD's would be to use an external SSD with the OS and apps on that drive. In either scenario, what are my rights as far as using/getting MacOS?? For instance, in Scenario #1 would I have the ability to take the refurbished MBP with removable SSD, and download a copy of Sierra or whatever comes after that? Or would I not be entitled since it is a used MBP? And in Scenario #2, if I bought an external SSD, would I be able to install Sierra or something newer on the blank external SSD and use that in lieu of the soldered in SSD on my new MBP?