If you're an American who has recently bought an e-book, you're in luck.
You can look up how much credit logging into your Amazon account on this page. The credit applies to e-books bought on the online retailer between April 1, 2010 and May 21, 2012. As Inc. points out, be sure to log into any e-mail address you used from 2010 to 2012 to be sure you're getting the full amount.
At Barnes and Noble, credits that came as a result of the lawsuit are automatically activated when customers purchase something online at BN.com or on a Nook device.
In 2009, Apple had offered publishers the option to set their own prices on their e-book platform with the condition that they would not sell their books to any competing e-book platforms like Amazon and Barnes and Noble for less. That led e-book prices on other platforms to go up.
As the result of a lawsuit, Apple paid $400 million in total to those who paid inflated prices for their e-books on competing platforms.