DVD titles play the way their navigation packs say: interleaved cells
as their own units, chapter names from the VMG, region mask, IFO stream
labels, a whole-title forced-subtitle probe, DvdPs-only stages. UHD
keeps mastering metadata and hdr_plus_flag and fixes dvcC. HD DVD
decrypts AACS per pack by each EVOBU's CPI and joins PEVOB features;
Class II MKBs are reported.