Every once in a while as you are trying to make a .iso file from a DVD using Brasero, you might get an error saying that couldn’t retrieve the keys because of libdvdscc2.
An alternative to that is a command line tool called dvdbackup which first needs to be installed
sudo apt-get install dvdbackup
After installing that program, you can make backup of your entire dvd, unfortunately not an .iso. You can create an iso from the folder that gets generated once you backup the dvd using dvdbackup. To create a backup, open your terminal and run:
dvdbackup -M -i /path/to/dvd/ -n Title_For_Backup -o /path/to/output/directory
To get help of dvdbackup you simply have to type in dvdbackup at the terminal.