If you use a Kindle, get out your calculator.  Cash may be coming your way.

Amazon emailed good news to its Kindle customers over the weekend, telling them they're entitled to a credit on prior electronic book purchases as part of settlements between major e-book publishers and the government.  Credit for an as-yet undetermined amount (the email reportedly indicates a figure between 30 cents and $1.32 for each e-book) will be given for every eligible Kindle book purchased between April 2010 and May 2012. The credit can be used to buy e-books or print books, or customers can request a check in the amount of the credit.

This announcement is fallout from action taken in April by the U.S. Department of Justice, which accused Apple and five publishers of illegally colluding on prices as part of an effort to fight Amazon's dominance of e-books.

In September a federal judge approved the DOJ's settlement with three of those publishers accused in the price-fixing scheme: Hachette, HarperCollins and Simon & Schuster.  Apple, Macmillan Publishers, and Pearson PLC's Penguin Group say they've done nothing wrong and have chosen to fight the charges in court instead of settling.

Amazon, which was not a party to the lawsuit, told customers that they will be contacted when the credit is applied to their account. That is unlikely to happen until February when the final settlement must be approved by the court.