Let's say you hire a carpenter to build you a house. You pay for all the materials and for the carpenter's labor. You move into the house and live there happily for many years.
Then one day the Carpenter shows up at your doorstep and says he got into financial trouble, made some bad guesses on Wall Street, has to give large amounts of money to another carpenter (but won't explain why), and the only way he can save himself is that by selling the house YOU paid to build. But, not to worry; you can go on living in that house you paid to build, it's just that from now on you will have to pay rent to the new owners!