I don't know if this is relevant to Massimo's case but it might be:
I had a problem a while back with Fedora 15 (and I don't remember which
version of OO or LO): I would discover that I could open a
password-protected spreadsheet without being prompted for the password.
It turned out that it had something to do with Fed 15 shutting down w/o
prompting to save an open and changed spreadsheet. When restarted, the
spreadsheet would open without password protection. The workaround
seemed to be to do a 'save as' at that point and check 'save with
password'.

More recently this hasn't seemed to be a problem, but I think it has
happened once or twice, though I didn't bother to try to figure out why.

On Wed, 2013-12-18 at 09:24 -0500, Andrew Douglas Pitonyak wrote:
> On 12/17/2013 10:12 AM, Massimo Del Zotto wrote:
> > However, I recently had a problem with OOo password protection. Somehow it
> > disabled password protection for a file I was working on and it took me a
> > while to restore it. Asking for help on OOo forum, I have been informed
> > password protection is somehow considered "unnecessary" by... I don't know
> > who to be honest.
> 
> You mean recently?As in the latest version of LO has a problem with 
> passwords?
> 
> > The forum administrator strongly
> > suggested me to not use it, and even pointed out a few previous cases in
> > which password protection caused data loss (!!!).
> Which forum, do you have a link to the post?
> 
> > I think *this is unacceptable *so I started looking more seriously at LO.
> > Digging the mailing list archives, I noticed there are quite a few messages
> > regarding password protection. It seems most problem were between keyboard
> > and chair, the only exception being perhaps an inter-operability problem
> > after switching to AES-256.
> >
> > In your experience, how is LO with password protection?
> Massimo, you seem to be more informed of this than I, but, I am only 
> aware of one (what I consider) real bug that existed with LO and 
> passwords. At one point, I was no longer able to open a password 
> protected file. Specifically, one version of LO was not able to open a 
> password protected file.  I am pretty sure it was LO and not AOO anyway.
> 
> I believe that I have seen things such as:
> 
> 1. I forgot my password, how I open my document
> 2. I am not able to open a password protected document created by MS Office
> 3. Problems signing a document
> 
> I don't ever remember anyone saying that password protection should be 
> dropped. Does not mean that it has not been said. I have seen people 
> pushing to drop the ability to write non-ODF format, but I don't 
> remember anyone advocating no support for passwords.
> 
> I have also seen reports of another bug that sometimes causes total data 
> loss of a file, but, since it is not reproducible in any sort of 
> meaningful way, the bug has not been researched.
> 
> -- 
> Andrew Pitonyak
> My Macro Document: http://www.pitonyak.org/AndrewMacro.odt
> Info:  http://www.pitonyak.org/oo.php
> 
> 



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