This should work with some caveats.
- Tbis probably won't work on WSL (Linux needs direct access to your hardware).
- For DVDs, you need to be sure libdvdcss is installed for this to work correctly
- You probably already have this on your system if you have successfully watched a dvd in Linux.
- You may need to replace
/dev/cdromwith the name of the device file corresponding to your drive.
- This creates an exact copy of the disk, including the unallocated space. You would probably want to follow the guide https://wiki.archlinux.org/title/Optical_disc_drive#Creating_an_ISO_image_from_a_CD,_DVD,_or_BD
- (@[email protected]'s use of mkisofs does the same thing because they copy the files on the disk rather than the whole disk. But you don't need makemkv. You should be able to use any method of copying the files and Linux should use libdvdcss to decrypt them.).
“deep magic”
Linux trys to treat devices like files. If you ran xxd /dev/cdrom, you would see every bit on the disk (not just those of the files, but those in the free space as well) in order from the first to the last (converted to base-16 in what is called a hexdump). Not that you need to see this, but your video player does. The “DRM cracking” is actually a feature of libdvdcss that makes it possible for the system to treat the disk this way. dd is just a general copying command and if Stack Exchange is to be believed, it isn't necessarily the best option (https://unix.stackexchange.com/questions/12532/dd-vs-cat-is-dd-still-relevant-these-days). But it probably is necessary for the linked guide to work because it has dd truncate the file.
edit: caveats is note spalled caceats
edit: file → files on the disk
Obtained at 
That was the joke