Would a pensieve be classified as a "dark" object?

[malaprop2000]

No: HPFGUIDX 89336

Or is it just a "high-galleon item?"

What I think I know:

As far as I can tell from the books, there is only one pensieve at
Hogwarts. It belongs to Dumbledore and is loaned to Snape for Harry's
Occlumency lessons. Of course, the latter half of the sentence is
based on Harry's assumption that it is the same pensieve - OOP, page
529 (US edition) - and, as we all know, Harry's assumptions are not
always correct. At no point are we told by JKR that it is the only
one. IMHO, it would be an indispensable item for a spy: Buy this NOW
and get those traitorous memories out of your head BEFORE you apparate
to a meeting. Malfoy would find it useful, too.

In the lexicon and the HPFGU archives, there is a theory that only the
owner of the pensieve can use it to store memories (blown out of the
water if the assumption that Snape borrowed Dumbledore's is true). It
makes sense to me that there would be only one user per basin
(otherwise incorrect/false memories could be placed there by an
accomplished wizard/witch). 

Another theory states that a wizard/witch would have to go through
miles and miles of red tape to own a pensieve. (I can't find canon
evidence for this and I'm wondering if that idea developed from the
fact that since only one time turner has been seen in the books and
Hermione had to go through miles and miles of red tape to use it, the
same would apply to a pensieve. If any one can give me a Title/Chapter
where it is actually stated that pensieve usage is restricted, I'd
appreciate it.) I'm of the opinion that we don't see a lot of them
because they are fiendishly difficult to make and therefore, very
expensive.

I can see where the Ministry might consider it a dark object because
it would mean that information could be hidden from them. AND an
object requiring some training in its use - apparently Harry just
falls into whatever memory advances the plot while Dumbledore can
"stir up" specific ones (or so it seems in GoF, Chapter 30) And
whether it is dark or light, fiendishly difficult and expensive to
make (no canon support for that statement - just appears that way to
me). 

I tend to think that it would be classified as a "dark" item,
requiring training and possibly a license, but an indispensible object
for ws/ws in positions of authority - or older ws/ws who might need to
clear out some space in their heads.

Any thoughts? Feel free to point out any gaping holes in the above.