Rights are valid claims to property. In other words, all rights are property rights.
^^ This is the correct answer and the one we must delve into deeper in order to be able to best defend a non-theological/non-theocratic concept of Rights. In order to define this we must also define what "property" itself is. There is no point in saying "valid claims to property" if we are not sure what property is
I'll start us off, please feel free to work off of this:
1. Upon birth the only piece of "property" I own is your self, and though someone else may have custodial status over it at that point, it still belongs to me. This is not because of another power gifting me the ownership of my body, but because I add value to the otherwise lifeless flesh and bones by being able to use it, train it, improve it, etc.
2. The method for acquiring more property is to add value to existing property through the use of your property. If all I own is my mind and body, I can use these to add value to other pieces of property. The previously non-existent
added-value(AV) becomes my property. It did not exist before I added them, and thus, the creation of this value by my makes it mine. The value did not exist before I created it, and thus what you create is yours.
3. Rights come from what I can do to this AV or property of mine. It is my right to do anything to my AV or property as long as I do not destroy the AV or property of another. I can trade it for goods, services, or money; I can choose to use it for myself; or I can choose to destroy it (as long as I am only destroying my own property and AV).
4. If anyone is attempting to take, use, or destroy my property (without my consent) I have the right to defend against these actions. The original goal of the government was to help me accomplish this goal of protecting my property.
5. I can acquire more property through free (not forced) trade and barter with other property owners and thus claim the same rights over it as if I had added the value to it myself.
6. The right to free speech, like every right, comes from my right to use my property, in this case my mind and body. The rights of the press come from the rights of property owners to add value to their property (paper for example) with their thoughts, or recollections of events.
Feel free to comment, critique, or add to this post.