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Pop a DVD into a computer and poke around the VIDEO_TS folder — those chunky .vob files are the movie itself. VOB is essentially MPEG-2 video wrapped with AC3 or DTS audio, multiplexed into a container that DVD players know how to navigate. Each file caps at roughly 1 GB because the format dates from the FAT32-friendly late '90s.
The format carries no DRM by itself — that's handled by CSS encryption on the disc level. Once ripped, a VOB file is just standard MPEG-2 that any decent media player can handle. VLC plays them without flinching. The catch is that individual VOB files may be fragments of a larger title, so you sometimes need to concatenate them or use a DVD-aware tool to get the full movie.
For anything modern, convert to MP4. HandBrake reads DVD folder structures natively and produces clean H.264 output. There's no technical reason to keep video in VOB unless you're authoring DVDs — and if you're still authoring DVDs, you already know that.