[Fyron]

Or, you can get the best of both worlds and distribute two versions of the mod, one with the bitmaps and one without it. Not everyone downloads every shipset under the sun. Permission to use other's work for your own distributed works is always good, of course. For personal use, it doesn't matter, of course, since you have permission to use it for your own purposes simply by the fact that it was made publically and freely available on the internet.