So let's pull back just a little bit and talk about rights. People will rant and rave for hours absolutely convinced that they have something called a right, without having a clear idea about what it is and how to justify it. According to Webster's New World Dictionary , a right is that which a person has a just claim to, a privilege that belongs to a person by law, nature or custom. I think that's a good definition. More on that in a minute.
Most rights come from law.
Law gives you a right entitling you to certain goods, privileges or freedoms. For example, I have a right to drive a car, but I only have that right because the law permits me to drive. If there were no law, I could not argue that it's my right to do drive. There are two exceptions here to rights coming only from existing law. One exception is rights established by long-term custom.