Chillingo originally released Angry Birds on PSN as a PlayStation Mini. Then, Rovio released an “official” version a few months later, which had better load times and new features. Unfortunately, since it was a different publisher, the newer Angry Birds was a “separate” game, which means that you can’t update the old Angry Birds into the new one - you have to pay $4 USD for the new version.
Understandably, this has caused an outcry among the PSN populace, and Rovio has announced: ”anyone who purchased the older version can contact PSN customer service directly. PSN customer service will check your account to verify the purchase, and provide you with a voucher to download the new version.”
In essence, to patch Angry Birds, you have to contact customer services to get a voucher to buy a new version free. How 1995 of Rovio.