Unknow Permissions bit on /dev/video0 device

I am using Ubuntu 10.10 release.

The following are just some of the few devices with a very very strange permission bit appendage.
Have a look at your own Ubuntu 10.10 system and see if you have the same (like) issue.

crw-rw-rw-+ 1 root video 81, 0 2011-06-11 15:43 /dev/video0
crw-rw-rw-+ 1 root video 81, 2 2011-06-11 15:43 /dev/video1
crw-rw-rw-+ 1 root video 81, 4 2011-06-11 15:44 /dev/video2
crw-rw-rw-+ 1 root video 81, 6 2011-06-11 15:44 /dev/video3

crw-rw-rw-+ 1 root root 10, 62 2011-06-12 01:02 /dev/rfkill

brw-rw-rw-+ 1 root cdrom 11, 0 2011-06-12 01:02 /dev/sr0

crw-rw-rw-+ 1 root video 81, 1 2011-06-12 01:02 /dev/vbi0
crw-rw-rw-+ 1 root video 81, 3 2011-06-12 01:02 /dev/vbi1
crw-rw-rw-+ 1 root video 81, 5 2011-06-12 01:02 /dev/vbi2
crw-rw-rw-+ 1 root video 81, 7 2011-06-12 01:02 /dev/vbi3

/dev/dri:
total 0
crw-rw-rw-+ 1 root video 226, 0 2011-06-12 01:02 card0

You will notice that there is a (+) at the end of the normal crw-rw-rw-+ <--- HERE

Other files (devices) within /dev are all OK and maintain the standard permission bits.

Has the Standard changed or has Ubuntu used something itself for whatever. ???
If so there is nothing saying so in "mknod" in info or the man pages.

I need an answer as the /dev/video has some very strange permission issues that don't seem logical at all
that I need to either put aside (because it is not caused by the /dev/video0 permissions but something else
in the applications program (which I bet it is).

Your timely assistance greatly appreciated.
Grahame.