That's what I did with the eye textures I made for Poser Styles Very Hi-Res Eyes. The mat files pointed to PoserStyle's reflection maps, but I did not include them in my zip file - only included those textures that I created. Don't see anything wrong with it. Don't see how that would be infringement either as long as you don't included the copyrighted maps that your MAT files point to. Laurie