libdvdread v4.9.9 had been ported to OS/2 and eComStation (2014/04/10)
Hobbes: http://hobbes.nmsu.edu/h-search.php?key=libdvdread-4.9.9.zip
"libdvdread provides a simple foundation for reading DVD video disks. It provides the functionality that is required to access many DVDs. It parses IFO files, reads NAV-blocks, and performs CSS authentication and descrambling (if an external libdvdcss library is installed)."
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Port by: KO Myung-Hun