Quote: "although does anyone know why there is an EAI signiture on the textures for MP9"
Prerogative of the copyright owner
Don't worry about it. Obliterate it if you want prior to building your game. That's within the powers granted to you by the license. I stamp a tag on most everything for a couple reasons.
1. Assist in identification of assets if they wind up God-knows-where on the net because of piracy/misuse.
2. EAI logos used in place of copyright protected logos so the developer doesn't have to worry about infringing (ex. Colt, HK, Glock, etc) and at the same time doesn't have to settle for blank spots where mfg. stampings/roll-marks should be.
3. Pride (Deadly sin, I know).
