Even for those who have the HDD, modding the software and still opening it to the public is illegal. Amuseworld can sue and I'm pretty sure Konami won't like it if there's a new version of Ez2dj out there even if it's just bootleg.
Well, I'm not sure... though they're different companies, if Andamiro doesn't do ANYTHING against bootleg Pump games, why AW would? Specially if they precisely CAN'T make new games?