I think they start aCis, but later they change to Lucera, but as you say, I may be wrong too, no matter what the package is, they make a lot of work to improve this pack, and we can say what we want but if you have a playable Java source server for years then this may not be a coincidence, it proves only one thing, no matter what files you have but what knowledge you have, no matter L2OFF or L2J.