Using a friend’s Netflix or Amazon passwords? Beware, cable giants are coming for you!

A coalition that includes Netflix Inc., HBO and cable-industry titans is stepping up efforts to crack down on password sharing, discussing new measures to close a loophole that could be costing companies billions of dollars in lost revenue each year.

Programmers and cable-TV distributors are considering an array of tactics to cut off people who borrow credentials from friends and relatives to access programming without paying for it. The possible measures include requiring customers to change their passwords periodically or texting codes to subscribers’ phones that they would need to enter to keep watching, according to people familiar with the matter.