You need a Super drive and a copy of DVD2ONE X and a decryption program like DVD Backup.
Use DVD Backup to rip the Disc
Then use DVD2OneX to shringk the info to 4.4GB so it will fit on a DVD-R. (if you invest in a dual layer burner you can skip this step.
And then you will need Toast to burn the info to a DVD-R in the UDF format.
You should only backup discs you own (which is completely legal).