What are the requirements for godparents in the Roman Catholic Church?

I talked to quite a few people today about Catholicism. I asked one couple questions about being godparents, because they were godparents for another child. However, this couple is not even Catholic. They also were not married in the Catholic Church. I was under the impression that godparents were required to be active members of the Catholic Church. What are the requirements for godparents in the Catholic Church? Does the Catholic Church sometimes disregard the rules regarding godparents?