And that is why the PIN is used to access a better encryption key (the AES 256 bit part, see below) to actually encrypt your data. I'm not sure about the source of that, but I believe it is from some/. comment.
That should be an interesting one. Buy the laptop, get the software for free (in that respect). Return the laptop but keep the license for free because it didn't cost you anything when you bought the laptop. You can return the OS separately but not the laptop you say?