@
fandangos, Kodi is open source software so anyone can view the source code (somewhere) within github. They are even able to copy and then modify the source code that they can freely fetch from github. The only restriction is that as part of the GPL license, any publically released modifications of Kodi must have the changed code base made available for others to see (and thus back ported into Kodi if felt worthy).
As it seems DVDFab Media Player is indeed a modded fork of XBMC/Kodi, as such DVDFab should make the source code changes available. But DVDFab seems to ignore copywrite laws, which is great for as iy allows us to rip our disks, but multiple MPAA law suites can't seem to squash them for their misdeeds as seen by AACS/MPAA. So i'd say DVDFab wouldn't give too hoots about releasing any source code changes as required by the GPL licence. I also doubt Kodi has the legal budget of MPAA to fight DVDFab should their product be a fork of XBMC/Kodi where such source code changes should be made available but have not (remebering MPAA is spending $$$$$ on whack a mole). Mind you, it could be that DVDFab provides all their BD/UHD code as a binary addon within their Kodi fork which may not require they release anything associated with this feature of interest. But who knows how the feature has been added, i don't.
Anyway as @
nickr said, and i'll parraphrase, if you can find the DVDFab source code (legally) and make it available or point to where it is available, i don't think you'd have to worry about the technical part of backporting this feature. Likely someone will take up that task on your behalf with glee.
However i doubt any encrypted playback feature would be part of Kodi core since decryption/unscrambling without AACS license is also a legal mind field which i doubt Kodi would like to get into (though i can't speak for them). But do feel free to ask DVDFab or search their site for the source code
Having said the above, i'd love to see an open source BD and UHD playback of polycarbonite disks on a linux HTPS but i suspect it will not happen for legal reasons.
Such playback can already be done today (with limits) via hacks and tricks. I've done it on my Win7 PC and can play back most BD titles with menues (better than my crappy PowerDVD12) but this simply moves the legal responsibility from the application makers (VLC in my case) to the end user who does the hacking and provides the key file, etc. These licencing issue will always ensure it's not a simple download, install & playback proposition for end users using software where the suppliers don't want legal wack-a-mole problems by not licensing their software with ACCS mafia.
Sadly this whole DB UHD playback of polycarbonite disks should hopefully be easier to achieve when a UWP version of Kodi can be installed on XBox One/S/X. Hopefully Kodi can then use the XBox One/S/X native BD/UHD player to handle such disks from within Kodi itself. It's a platform specific solution but better than nothing