Morality is objective, as there would be no purpose in it if it was subjective.  You could kill and say "to me it felt right"

Morality is a survival mechanism, as we can't survive without basic rules.

Morality dictates you can't kill or enslave others (which is how I'm defining liberty here)

Therefore,
An individual's unconditional objective rights are derived morality, which is an emotional experience in the human mind, that should be governed by objective rules, derived from reason.

This could be also be phrased,
Rights come from mankind's ability to reason.