>> (I still don't understand the meaning of such a feature on systems 
>> with secured filesystems).
> 
> 
>     The filesystem "security" usually lets you write anything in your
> user space.  Meaning it won't protect you from screwing up any user file
> unless you manually change its write permission through 'chmod'.  Such
> attack is possible via povray SDL when I/O restrictions are not set.
> I/O restrictions just try to add another security level on top of the
> filesystem permissions.
> 
>     - NC

Ok, thanks for these explanations. Since I'm a single user I have no 
need in this sort of securities and that's what make my wrong fealing.

Thierry

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