The way I spot a texture that uses part of the daz texture is to look at the "inner mouth" section. That weird red thing with the ridges in it. Doesn't look like a real body part at all, but soooo many maps use it. It first appeared on the original DAZ vicky texture and if you see it on a map you've gotta at least wonder. Maybe someone decided they'd paint the exact same inner mouth thingy but it's unlikely because it's not a very good inner mouth, ya know? But it's distinctive and proprietary anyway. The other thing I look at is the fingernails and toenails...they seem to migrate around a bit too. Basically the parts that carry the least "personality" are the ones that are going to migrate from copyrighted textures into other works. But they shouldn't.