CNN:

Last week Sony changed the terms-of-service document for its PlayStation Network, asking U.S. customers to forfeit their rights to file class-action lawsuits against the company and its partners. Customers can opt out by sending the company a letter in the mail. … Sony said this week that the new terms-of-service changes were made, as some analysts suspected, in response to a Supreme Court decision in April. In that case, AT&T Mobility was permitted to include and enforce a clause in employment contracts that bars workers from bringing class-action suits.

Initially many suspected the changes to the PlayStation Network terms of service was a defensive reaction to lawsuits filed against Sony after the service was breached by hackers earlier this year, exposing personal information for tens of millions of accounts.