Ogle 0.9.2 and SuSE 9.0 vs USB DVD-drive

Hi folks,
I have just installed the latest RPMs for ogle and its requirements
which seemed to go smoothly, but when I try to play a DVD from the
command line I get the following errors. Could someone give me a clue
please? I'm not an experienced linux user, but I can handle the basics.
Cheers!
Miles

> miles@linux:~> ogle /media/sr1
> libdvdread: Using libdvdcss version 1.2.8 for DVD access
> libdvdread: Attempting to use device /dev/sr1 mounted on /media/sr1 for CSS authentication
> libdvdread: Could not open /dev/sr1 with libdvdcss.
> libdvdread: Can't open /dev/sr1 for reading
> libdvdread: Device /dev/sr1 inaccessible, CSS authentication not available.
> libdvdread: Using libdvdcss version 1.2.8 for DVD access
> libdvdread: Attempting to use device /dev/sr1 mounted on /media/sr1 for CSS authentication
> libdvdread: Could not open /dev/sr1 with libdvdcss.
> libdvdread: Can't open /dev/sr1 for reading
> libdvdread: Device /dev/sr1 inaccessible, CSS authentication not available.
> FATAL[ogle_mpeg_ps]: dvdreadblocks failed
> miles@linux:~>

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