They're probably posting here because of this. Due to the trend of people complaining that their codes don't work (first for the Ace Combat giveaway and now this), I suspect that the codes can only be used on US PSN accounts, as is stated on the Ace Combat giveaway page that was updated recently to include that information.silentexistence

I was provided a DLC code for the PS3, however, when I attempted to input it, the PS Network gave me an error stating the code was input wrong or already used.

I contacted techincal support and they directed me to this forum.

Thank you for your time.