Quote - why do they have to make so you need a decoder? 
There are lots and lots of character injections that don't need a decoder?

The Melody and Micah characters are based on DAZ meshes, but they are reworked meshes to add tail and some of the head augmentations.   These hybrid meshes contain both geometry from DAZ and Little fox.  Because it is not a point-for-point morph of DAZ's mesh, the injection/morph method won't work.   Littlefox has to create a new .obj file (geometry).   The upside of this is she can add what is needed to give a very fluid, complete character which can wear A3's and H3's clothes.   The downside is that she can't legally distribute the .obj (which contains both her sculpting and modification like adding a tail) because it contains DAZ's intellectual property.  The way around this is to use RTE encoding which computes the "deltas" between DAZ's models (A3 and H3) and Littlefox's rework.   The lets her distribute those deltas as an RTE file which does not contain DAZ's property.   When you decode, the RTE decoder recreates Littlefox's geometry file from the A3/H3 in your library plus those deltas.

It's a bit of a pain, but fortunately you only need to do it once.   Hopefully someone will cook up a better RTE system in the future that's a bit more bulletproof.   (For example, RTE has a hard time if DAZ changes the base file even a little bit because the deltas were computed very specific from the file used during the encode process.)

-K