I did well understand what you meant, but what I mean is that my usage 
of povray won't harm my computer nor my personnal files because I don't 
use external files (excepted the ones from Gille Tran and Chris Colefax 
wich are known to be sure).


>>>     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'.
>>
>>
>> Ok, thanks for these explanations. Since I'm a single user
> 
> 
>     Well in fact my explanation attempt was a bit unclear and apparently
> somewhat confusing, as guessed from your "Since I'm a single user" 
> statement.
> Please read again:
> 
> http://www.povray.org/documentation/view/3.6.1/794/
> 
> which better explains what I meant by "it won't protect you from 
> screwing up
> any [...] file" in your user space -- note the correction I make here  :-)
> 
>     - NC

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