fc4 - dvdrip/libdvdcss can't access /dev/dvd

I'm stumped on this one:

I've got a shiny new FC4 installation and am trying to rip a DVD with 
perl-Video-DVDRip.  All of my settings should be correct -- they're the 
same as what I was using in FC3.

When I attempt to read the DVD's contents, I get the following error:

libdvdread: Using libdvdcss version 1.2.8 for DVD access
libdvdread: Could not open /dev/hdc with libdvdcss.
libdvdread: Can't open /dev/hdc for reading
(iodump.c) unable to open directory "/dev/hdc"

/dev/hdc is the device of my DVD drive, and is owned by the user running 
dvdrip, with 666 permissions.  selinux is disabled.

Is this a libdvdread problem or a libdvdcss problem?

Thanks,

-- jeremy