Need a copy for each player?

I have a PS3 copy of the game, and the launcher is already installed on it. Would my sister be able to register an SE account and just subscribe, or does she have to buy a seperate copy of the game? I'm in EU, so it's not available for purchase on PSN (I checked) and would have to be a physical copy if so.

The PS3 version is locked to the PSN / SEN account it's originally registered to or purchased on in case of DD. The DD might be available with tomorrow PSN store update (just my guess, NOT an official info). Do NOT try to purchase the DD via JP or NA PSN account - it will not work on your main EU account.