On Wed, 21 Feb 2007, Elad Efrat wrote:
> > Is this documented in man page or other official documentation?
> 
> yes, rather clearly:
> 
> 	The error ``Operation not permitted'' may indicate that the
> 	mount options include privileged options and/or don't include
> 	options that exclude privileged options. One should try using
> 	at least ``nodev'' and ``nosuid'' in such cases:
> 
> 	  mount -t cd9660 -o nodev,nosuid /dev/cd0a /mnt

This change in user-visible behaviour is not documented in
src/doc/CHANGES.

--apb (Alan Barrett)