Do you believe in natural rights?

The Declaration of Independence:  “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.”

Andre B., in a comment on my “pro-choice-ism” post:  “persons acquire rights because the societies they are a part of decide to grant them.”

What about you, dear reader?  Do you believe in “natural rights” – that is, that certain rights are “endowed by [our] Creator”?  If so, how expansive are they?  Or do you believe that societies simply determine what rights their people are or aren’t granted, and if you happen to live in a society that grants fewer such rights than another society, well then, too bad for you?

UPDATE:  A quick clarification:  here’s a fuller quote from Andre:  “[why persons acquire rights] seems fairly simple “(at least in practice): persons acquire rights because the societies they are a part of decide to grant them.”  Which makes this a two-part question, if you differentiate between “in principle” and “in practice.”