How do I change cdrom permissions?

When do you receive the error message?
Please open a terminal window then post here following command result:

ls -la /dev/cd*

I receive the message when i open the drive properties-permissions tab and try and change the permissions for Owner,Group or others from Read-Only to Read and Write.By the way it says Owner is unknown.
Here is the result of the above command

lrwxrwxrwx 1 root root 3 2007-11-01 16:53 /dev/cdrom2 -> hdd
lrwxrwxrwx 1 root root 3 2007-11-01 16:53 /dev/cdrom3 -> hdc
lrwxrwxrwx 1 root root 3 2007-11-01 16:53 /dev/cdrw2 -> hdd
lrwxrwxrwx 1 root root 3 2007-11-01 16:53 /dev/cdrw3 -> hdc

Please tell us what are unable to do...: you have already the max permissions for those files
Are you trying to burn cd or what...?
Which program do you use to burn your cd...?

Using terminal you can do powerful "sudo" commands:
sudo chown root.root /dev/cdr*
sudo chmod 777 /dev/cdr*

Thank you

Since the devices are symbolic links can you please post the output of following command?

ls -la /dev/hdc /dev/hdd

Thank you

The reason I am trying to change the permissions is to try and get DVD95 & or k9copy to detect my dvd burner.
Here is the output from the above command

brw-rw---- 1 root cdrom 22, 0 2007-11-03 19:16 /dev/hdc
brw-rw---- 1 root cdrom 22, 64 2007-11-03 19:16 /dev/hdd

so you can try the following:

sudo chmod 777 /dev/hd[cd]

But I don't think will resolve your problem.

You can also check if your user is in cdrom group looking for "cdrom" in /etc/group file
Mine is:

   cdrom:x:24:haldaemon,myuser

I think this has done the trick.
Thanks everyone for your help.