DVD file permissions

[toyfactory]

Hi, nice to meet you all...

I've been getting to grips with Ubuntu for about a week.  Things
have been going pretty nicely, Japanese text input sorted, MPlayer
sorted.  (I can't seem to print from the Gimp and there's no driver for
my scanner though, so I won't be removing the Windows partition anytime
soon.)  Anyway, today's problem has been driving me up the wall so I
thought I'd throw it to the list!

I can mount a CD-ROM and access the files as normal user with no
problem however if I mount a data DVD only root can access the files.
(Mounting a video DVD works without a hitch, by the way, so I guess
it's something to do with the filesystem on the data DVD, which was
made as a backup in Windows.)

This is the line from /etc/fstab I'm currently using:

/dev/hdc   /mnt/cdrom   udf,iso9660   ro,users,umask=0222,noauto   0   0

The umask=0222 works fine for mounting an ntfs partition so I thought
I'd try it for the DVD.  I've also tried playing around with some of the
other options listed in man mount without success.

Any suggestions?

Thanks,

Nick