To do what I want to, I need space in which to do it. Imprisonment is being confined to a small space. Imagine a future time with human colonies in space, on the Moon, and on other planets - and considerable space travel between them. Freedom is space. According to the best evidence available to me, if I die I lose all freedom - all my options have expired.
Death is the biggest and ultimate enemy of freedom.
My highest priority as a freedom-lover is to overcome death and render it obsolete. Death must be killed. Freedom is physical immortality. The definitions and descriptions of aspects of freedom are programs in the mind. They affect how we see the world.