Ps3 – Do games/DLC downloaded on one account show in the history of another account

The problem with US DLC not working with a non US game is due to the game TitleID being different. US games have a TitleID starting with BLUS{5 numbers} and EU has BLES{5 numbers}. If you have for instance an EU game it stores gamedata and savegames in a folder starting with BLES00000 for instance. And the DLC will try to install under BLUS00000 so your game cannot see the DLC due to being installed in a different location. There is no way to fix this without getting a copy from the appropriate region. On the spine of the game boxes on the bottom is the TitleID for that copy.

List of most used titleID prefixes: BCUS - sony REGION 1 game BLUS- 3rd party REGION 1 game

BCES - sony REGION 2 or 4 game BLES- 3rd party REGION 2 or 4 game

BCAS - sony REGION 3 game BLAS - sony REGION 3 game

Make sure you get a copy from region 1 if you have US DLC.

It's possible to share PSN games between PS3 systems. There's a thread on the SomethingAwful forums that goes into a good bit of detail as to how to do this.

It appears to be at least acknowledged and ignored by Sony, but keep in mind that you should be very careful not to violate any of the terms of your PSN agreement, lest you lose your games or access to the online support of your console. This process is also not without risk, and your "friend" might do something dishonest and cheat you.

Do note that recently Sony changed the rules, so that you can only have 2 PS3 consoles sharing a single copy of a PSN game.