The ltmmDVD_ERROR constants specify DVD error conditions.
typedef enum ltmmDVD_ERROR
 Something unexpected happened, perhaps content is incorrectly authored. Playback is stopped.
 Key exchange for DVD copy protection failed. Playback is stopped.
 DVD-Video disc is incorrectly authored for v1.0 of spec. Playback is stopped.
 The Disc cannot be played because the disc is not authored to play in system region. The region mismatch may be fixable by changing the system region with dvdrgn.exe.
 Player parental level is lower than the lowest parental level available in the DVD content. Playback is stopped.
 Macrovision Distribution Failed. Playback is stopped.
 No discs can be played because the system region does not match the decoder region.
 The disc cannot be played because the disc is not authored to be played in the decoder's region.
For more detailed information, refer to the Microsoft documentation for the DVD_ERROR Enumeration.
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