Qual a base dos direitos humanos?

We live in an age of human rights. The language of human rights has become ubiquitous, a lingua franca used for expressing the most basic demands of justice. Some are old demands, such as the prohibition of torture and slavery. Others are newer, such as claims to internet access or same-sex marriage. But what are human rights, and where do they come from? This question is made urgent by a disquieting thought. Perhaps people with clashing values and convictions can so easily appeal to ‘human rights’ only because, ultimately, they don’t agree on what they are talking about?