To me, it is all about self-ownership. Rights are not a real, tangible thing...nor are they given to us by 'our creator'...we grant rights to each other because we have figured out, as a race, that everything works better when we recognize each others rights.
You own yourself, and by virtue of being a conscious human being you have the right to your life.
Since you own yourself, and no one owns you, you have a right to liberty. You should be able to do anything you wish so long as it doesn't violate or infringe upon the rights of another person.
Since you own your body and your life, you also own your labor because people generally trade their labor for something of value. Usually money. This money represents a portion of your life, which you own, so it then becomes your property. Subsequently, anything you exchange the money for, which represents a portion of your life, also then becomes your property.
