✅ Using VX Ace BGM to MV is okay. Same with SE. It's okay to place SE to BGS/ME.
❌ Just no trimming of audio file.
✅Resizing graphics such as images from VX Ace to MV Sprite sheet is okay, too. Color Hue Changer is okay for monsters.
❌ No editing: no recolors using external software. No creating new tileset that doesn't come with the engine. No Photoshop, no Gimp editing.