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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


Yeah, an already ripped DVD or a non DRM protected DVD, which is as difficult as copying files from a USB and why dd works here.
non DRM protected DVD. It’s actually from Disney so I was quite surprised when there was no DRM
If it’s Disney without DRM it’s probably a bootleg DVD