Non_Open Source materials being embedded in OS stacks/standalones.

[Roger Eller]

And there's digital watermarking via steganography.

"As a simple example, a sender might start with an innocuous image file and
adjust the color of every 100th pixel to correspond to a letter in the
alphabet, a change so subtle that someone not specifically looking for it
is unlikely to notice it."

http://en.wikipedia.org/wiki/Steganography

~Roger
On Apr 13, 2013 2:53 PM, "Richmond" <richmondmathewson at gmail.com> wrote:

> On 04/13/2013 09:29 PM, stephen barncard wrote:
>
>> Photoshop has a plugin and a paid service to apply invisible watermarks to
>> images. They've had this for over 20 years.
>> As most serious photographers have photoshop, I would assume it's been
>> used
>> a lot over the years, even pre-internet.
>>
>
> http://graphicssoft.about.com/**od/gimptutorials/ss/graphic-**
> watermark.htm<http://graphicssoft.about.com/od/gimptutorials/ss/graphic-watermark.htm>
>
> Richmond.
>
>
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