It's open source for a reason! However, the art assets and music that aren't from FireRed may not be open; since I don't have the time to remember who exactly to ask for what, err on the side of caution and only use code I wrote or resources that were directly ripped from FireRed.

Hey Sierra, may I use your CrystalDust disassembly source? I planned to recreate FireRed on Emerald's engine and your hack would be a great base.