<p>Earlier I used dd for taking security copies, but it do not handle
DVDs giving read errors (which are quite a few of them). I've also
tried using
-<a href="http://people.skolelinux.org/pere/blog/Ripping_problematic_DVDs_using_dvdbackup_and_genisoimage.html">dvdbackup
+<a href="https://people.skolelinux.org/pere/blog/Ripping_problematic_DVDs_using_dvdbackup_and_genisoimage.html">dvdbackup
and genisoimage</a>, but these days I use the marvellous python library
and program
<a href="http://bblank.thinkmo.de/blog/new-software-python-dvdvideo">python-dvdvideo</a>