Quote - However I'm unclear how you would prevent other morphs being written into the PMD, and hopefully someone else will know. Set them all to zero before saving, at least.

All the morphs in the figure will end up in the pmd, irrespective of whether they are set to zero or not.

A solution, as TrekkieGrrrl pointed out, is to load your morphs into a blank (morph stripped) version of the figure, then create the pmd from that figure.

You can create a morph stripped version of any figure using 'Morph Manager 4' (MM4). * Save a copy of the target figure to the library from within Poser (to resolve any 'readScript'). Make sure that 'Use File Compression' is turned off in General Preferences, before saving the figure.

• Start MM4, and load any pz2 file into one MM4 window (this forces MM4 to display more options).
• Load the  copy of the target cr2 into the same MM4 window.
• Click the 'More Options' button.
• Select 'Delete all morph targets from file'.
• Save the modified cr2 back to disk with a new name, eg "V4-Stripped.cr2".

Or, as EnglishBob pointed out, there were blank versions of V4 and M4 posted on the old DAZ forum, but I don't have a link. Many figures come with development versions, and I assume it os OK to use these to create your pmd files from, but you should check the EULA to be sure. Or there is the D3D Binary Morph Editor as another option, but starting with a blank cr2 is probably the safest way.

As to what copyright law allows you to include, it is generally believed that that the morph must be entirely your own work, and not derivative of any copyrighted morphs. You can't remix other peoples morphs and call that an "original morph".

P.S.
I have never used MM4 on a weight mapped figure, but see no obvious reason why it would not work on such figures.