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Plug in the dvd 
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Run lsblkto see if it got detected
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Run dd if=/dev/cdrom of=dvd.dvd status=progress
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You can now play the ripped dvd using mpv: mpv dvd://0/dvd.dvd
If you need to get rid of digital restrictions management, you can try this guide


Is this for cracking drm? If so how do you pin a comment on lemmy?
Yep. Bypasses DRM.