IT/Software/Applications/Media
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Making "Backups" of DVDs for playing from hard disk.
You need to install the css (Content Scrambling System)
Best done from the vlc pages.
https://www.videolan.org/developers/libdvdcss.html
sudo apt install libdvd-pkg
sudo dpkg-reconfigure libdvd-pkg
This can be very complicated. Below is a possible solution if you can't install the above packages
sudo apt install libc-bin/focal libc6/focal libc6-dbg/focal locales/focal
Be WARNED: This will uninstall all kinds of things and can be risky.
Cutting Videos
This can be done on the command line with ffmpeg
Easier to get the appimage of LosslessCut.