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For the game jam, you can use music from the MV Trinity Resource Pack or other RPG Maker engines as long as you legally own them and your game is made in an official RPG Maker engine. Since RPG Maker Unite is part of the Maker series, you can use music from RPG Maker XP, VX Ace, 2003, MV, and MZ in your Unite project.

However, regarding using RPG Maker assets in other engines (like Unreal Engine), this depends on Gotcha Gotcha Games’ official terms of use. The clause you referenced suggests some assets may be used outside RPG Maker, but it’s best to check with official GGG support for confirmation on Unreal Engine or YouTube animations.