What does it mean to say that the poeple's natural rights are "inalienable"

People's natural rights are "inalienable" means that natural rights there - in theory - is no authority who can revoke those rights because we have those rights not because of some actions or merits, but because we are humans, and it is our belonging to the human race what justify those rights. So, because those rights are bound to us because of our humanity, no one could take those back.