If you find yourself without any light reading you might want to check out the fine print in the Terms of Service for EA's digital distribution platform service, Origin. Although it was last updated in June, it has been recently noted that if you fail to log into the service for 24 months you may find that all of your "Entitlements" will have been removed.
According to the 22 sectioned document: "Entitlements are licensed rights granted, awarded, provided and/or purchased by you to access and/or use online or off-line elements or features of EA Services and/or products.
"We do not guarantee that any Content or Entitlement will be available at all times or at any given time or that we will continue to offer particular Content or Entitlements for any particular length of time. We reserve the right to change and update Content and Entitlements without notice to you. If you have not used your Entitlements or Account for twenty four (24) months or more and your Account has associated Entitlements, your Entitlements will expire and your Account may be cancelled for non-use. Once you have redeemed your Entitlements, that content is not returnable, exchangeable, or refundable for other Entitlements or for cash, or other goods or services."
This basically covers any DLC & unlockable content but also the serial codes that you use to gain access to your purchased games in the first place.
EA's treading some interesting grounds, especially with the commotion and uncertainty surrounding Battlefield 3 and whether or not it will be available on the online distributing service, Steam.