Like many of us, Annie Leibovitz is having tough financial times.
As anyone in her position, Ms. Leibovitz needed some cash in the form of a loan.
What did she have of value to put up as collateral?
Her copyrights. 
At the risk of being repetitive, especially with respect to the students I work with in my business of photography classes, as a photographer your copyright is your most valuable asset; register it and keep it.