The UNDHR, like its counterpart the US Constitution, is a piece of toilet paper written up in a more idealistic age for the sole purpose of quietening the proles. It doesn't actually mean anything; it isn't a law, because there's no means of enforcing its ideals.
The only rights you have are what you can a) take by force and b) retain by concealment from those who would take them by force - either alone or in concert with others. It's called "the law of the jungle", and it's the only absolute law, enforced by physics, that applies universally to all life, intelligent or not. You either hunt or hide. Everything else is window dressing.
I've noticed that when I've posted these sentiments before, I seem to attract a few downvotes. I probably will this time, too. But it does make me wonder; do the downvoters not understand basic physics or something? A stronger force will overpower a weaker force. A force will take the path of least resistance. It's not something you can argue with. It's just the way this universe works.