Amazon.com is accused in a lawsuit filed Thursday of billing customers millions of dollars in charges racked up unknowingly by children. The Federal Trade Commission filed the lawsuit, which seeks to require refunds for parents and other account-holders and to ban the practice in the future.

The complaint alleges that when Amazon introduced in-app charges to the Amazon Appstore in November 2011, there were no password requirements of any kind on in-app charges, including in kids’ games and other apps that appeal to children. According to the complaint, this left parents to pay for charges they didn’t authorize.

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