[Digikam-devel] [Bug 268981] WISH: Digital Right Management with integrated steganographic capabilities (write and read).

[Andreas K. Huettel]

https://bugs.kde.org/show_bug.cgi?id=268981





--- Comment #7 from Andreas K. Huettel <dilfridge gentoo org>  2011-03-26 11:49:22 ---
> I am not familiar with documentations of several picture formats. Maybe you are
> right; but still hesitating to agree, as many raw-formats seem to be
> proprietary by camera producers [NIKON: nef, CANON: crw, cr2 etc.). digiKam can
> handle these. In spite of their format description is not "open", in many
> cases.

That's true... since I dont use these formats yet so far, I tend to overlook
them. :(

> Thank you for revising my thoughts about "watermarks". Am I right if I
> understand "watermarks" as a _visible_ (!!) mark, one can choose? 

It can be both, that's why I wrote about "invisible" watermarks.
So far, digikam only uses the term for visible watermarks.

> The second part of your understanding ("... robust meaning that they survive
> image resizing, cropping, recompression, ") fits my intention better. 

In general, 
* robust alone is not the problem (think big fat ugly text in the middle of the
image)
* invisible alone is not the problem (think hiding data in the least
significant bits)

> - digiKam integrates external work as in KIPI-Plugins, Kdcraw, etc, provides
> interfaces to comercial or copyright protected software services (Marble,
> shmug, Facebook, etc.). That is the reason which I assume one can handle the
> question of opensource and free availability.
> - Why digiKam does not provide an interface to (maybe) comercial suppliers for
> Digital Rights Management? The legal background would still remain to users,
> not be related to digiKam, I guess.

Well I guess that's a question the digikam devs will have to decide. I'm
certainly agreeing that there are people who would be interested in such a
feature.

> - Did you check out the links from Comment #2? There are many opensource
> projects dealing related topics, as in
> <http://www.dmoz.org/Computers/Security/Products_and_Tools/Cryptography/Steganography/>
> In "worst case", some authors
> ahould be willing to support this idea. I mentioned Markus Kuhn, already.

Some time ago I searched myself for a while for such a program and did not find
anything reasonable that supports "robust AND invisible". 

I'll go through the links later in detail, the ones I checked so far focus on
steganography. Which is fine for the "invisible" part, but once you crop,
recompress, or convert your image, you are usually lost.

Of course it would be great if you could get one of the experts interested. :)

Here's an example on how these techniques are used "professionally":
http://www.cl.cam.ac.uk/~sjm217/projects/currency/

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