Jim Seymour wrote
[snip]
>
> Question: Do recent (i.e. 4.3.x.x and later) versions of LO
> *capably* allow the opening/editing/saving of PDF files that are
> writable and not encrypted or otherwise protected?
Simple answer... YES, but LibreOffice is not a PDF editor and will
never be. It will always import to ODF native formats, and then must
export/print back to PDF as a round trip process.
[snip]
Surely a distinction without a difference?
It might be possible to ask
your distro's package maintainers if they would be kind enough to make
a more recent version of LibreOffice available in their repos.
[snip]
Even my Linux Mint 17 MATE install at home has only 4.2.7 (near as I
can tell, from here). I doubt I'll see an LO upgrade for Mint 13.
In any event: Not particularly germane: 99-44/100% of the end-users at
work are using MS-Win7 Pro, and it for them I ask this question. If LO
can do the job: Great. If not: I guess we'll have to go out and but a
few copies of some-or-another PDF-editing-capable thing.
> Your unsupported version of LibreOffice 3.5.7 was release 5 Oct
> 2012 and is well past its end-of-life from the projects
> perspective.
- From the perspective of a commercial enterprise, the EOL dates
guarantee that LibO is not suitable.
This is a concept that the open source community does not seem to
grasp. This is but one reason, out of many, that Linux will *never*,
*ever* replace MS-Win on the desktop. It is one of the reasons I no
longer suggest the idea.
With thirteen months from feature freeze, to EOL, an organization
doesn't have time to test, much less deploy new versions, before they
are passed the EOL date. Which makes purchasing Tier 3 support
mandatory.
[snip]
And, if we had to purchase the stuff, anyway, why not just "go with the
flow" and continue purchasing MS Office?
Not trying to be an urmas. Just trying to point out the realities of a
business environment. I have all the time in the world (that I care to
invest, anyway) at home. At work...? No, not so much.
Even at home: I install "LTS" versions of stuff where I can, and let it
run until it EOLs.
None of the above is by way of complaint. It is what it is, and I'm
more than happy with it as it is. It's worth way, *way* more than what
I paid for it, so who'm I to complain? 
Thanks for the responses, everybody. I'll see if I can install 4.3.x.x
or later on my laptop, under its Win7 Pro boot, and see if it'll do what
we need.
Regards,
Jim