What is Freedom
My answer to that question is this:
Freedom has two layers. The core layer of freedom is the freedom of mind; the acknoledgement of possible choices and the willingness to accept the consequences of ones actions.
The outer layer is freedom of action. Freedom of action is the ability to do anything one wishes, as long as your actions do not infringe on the implied and explicit consent of another. In order to truly have this level of freedom a person must be able to participate equally in the formation of the formation of implied and explicit consent agreements. This does not mean they have total veto of such agreements, it merely gives them the opportunity to register their preference and lay out their arguments for why those agreements should have a certain form.
When one is imprisoned, one can still maintain the core layer of freedom, even though one does not have full freedom of action. When one lives in a truly free society, one can enjoy both layers of freedom.