Originally posted by Sticktoit360
Go onto your friends account, go to Account Management, System Activation, PS3 System, Game, Deactivate System. This will deactivate the DLC until you activate it again using the same method but choosing Activate System. You will not have to download or install it again once it is reactivated.
Are you sure? Im sure if you deactivate it it wipes all DLC as it frees up one of the activation slots.
If this would true you could keep gamesharing without any restrictions as each user could just deactivate and then reactivate the DLC? so i dont think this will work