Why Sony And Other Companies Don't Offer Free Credit Freezes

Like the vast majority of companies that have been hit with security breaches, Sony is just offering affected customers free credit monitoring. Why don't companies offer free credit freezes? Ron Lieber looks into this in his New York Times article: ID Theft Tool That Sony Isn't Using

Credit freezes are the best defense mechanism available for people whose data may have fallen into the wrong hands, and it’s a shame that Sony executives don’t seem to have realized this.