I have to disagree. There are some very definite indicators of whether someone is free or not. You can be conditioned to accept your situation but that doesnt make you free.
Everyone has their own indicators. If you are conditioned to accept your situation in a way that makes you feel free, then you are free. Birds and dolphins probably have their own definite indicators of whether someone is free or not that the "freest" human by your criteria would fail spectacularly.
