No major music label has sued USDX developers because the project provides no copyrighted content itself – only the engine. Song pack creators assume individual risk.

UltraStar Deluxe is a free, open-source karaoke game inspired by SingStar . While the base game is a platform, the lifeblood of the experience is its —user-generated collections that turn a PC into a professional karaoke machine. What are Song Packs?