Cameron I think your right on in saying that Hart is not nessacarly recognizing anything else as a natural right except the right to freedom. I thought this was a really cool article I can see Hart's point and his analysis brings "natural rights" in to a new light. I liked the way he tied promise making, obligations (spoken or moral), and personal commitments all back to one thing, The right to freedom. Although his writing was a bit complex by the time I got done reading I was thinking, yea, a simple explination to natural rights. What a good arguement.