A California district judge has preliminarily approved a settlement that will allow parents to receive a refund of at least $5 if their children made in-app purchases on "free" computer games without parental consent, the web site Top Class Actions reported.

A Federal Trade Commission investigation found that game developers were advertising free games on iTunes, but then charging kids to buy "gaming currency," such as virtual supplies or currency. With a single click and without any password requirement, children could charge $100 or more to accountholders' credit cards or PayPal accounts, Top Class Action said.

Details on filing a claim haven't been announced yet but interested consumers can check back to Whistleblower for information when it becomes available. The filing deadline is July 31.