You just remapped the OBJ, right? That is what Objaction Mover is for. It encodes the new OBJ file using the old OBJ file. Only people who possess the old would be able to open the new. Zygote has, I believe, agreed to the use of pcf files created in this way to distribute modified versions of their meshes. Objaction Mover is for the PC. On the Mac, I believe the excellent MacConverter can create encoded pcf files.