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From Trevor Hurst <t...@sgi.com>
Subject Re: [users@httpd] Handler for images in a directory - watermark the image
Date Tue, 04 Mar 2003 02:44:50 GMT

There was an article in (I think) Dr. Dobbs about that 8 months
or so ago. Regarding Digital Watermarking and fingerprinting.

-- Trev


Carl wrote:
> 
> I have heard recently that there were ways to "watermark" your images that
> supposedly still appear even when printed.  DAmn, I cannot remember or find
> (just now) the reference to it.  Had to do with a person displaying his
> photographs/artwork and not wanting it to be used elsewhere (at least w/o
> attribution).  Actually, now that I think more about it it was related to my
> apache research.  So maybe on the apache news/letter site?  The first part
> of it had to do with refusing to serve up an image if the request came from
> another web site (not yours).  Then the watermarking was mentioned.  Sorry
> to run on here, but if I find the reference I'll be pack and post it.
>   -carl
> 
> ----- Original Message -----
> From: "Chris Taylor" <chris@x-bb.org>
> To: <users@httpd.apache.org>
> Sent: Monday, March 03, 2003 3:57 PM
> Subject: Re: [users@httpd] Handler for images in a directory.
> 
> > Either way, you'll end up displaying the image.......
> >
> > Print screen
> > Photoshop
> > Paste
> > Save :)
> >
> > You can't avoid it, people will ALWAYS find a way around, there's nothing
> to
> > stop them passing your CGI URL to a download manager either.....getting it
> > that way. It's an impossible task, and (as Jeff pointed out) a bit
> pointless
> > too :)
> >
> > Chris Taylor - chris@x-bb.org - The guy with the PS2 WebServer -
> > http://www.x-bb.org/chris.asc
> >
> > ----- Original Message -----
> > From: "Chris Meadors" <clubneon@hereintown.net>
> > To: <users@httpd.apache.org>
> > Sent: Tuesday, March 04, 2003 12:04 AM
> > Subject: [users@httpd] Handler for images in a directory.
> >
> >
> > > I was helping a guy with a site who has about 400 images in one
> > > directory.  He already has links that tigger a pop-up window that
> > > displays each of the images from various locations on his site.  The
> > > Javascrip pop-up hides the menu bar, tool buttons, and address bar.  But
> > > he was worried that people could still easily see the location in the
> > > title bar of the window, and they could right click the image to save
> > > it.  (I know these are all just little things, and if an image is
> > > servered it can be saved, but he would make him happy to stop the right
> > > clicks.)
> > >
> > > So I added a handler that calls a CGI script to wrap the image in HTML
> > > with a simple title and some more Java script to disable to right
> clicks.
> > >
> > > The program is, this wrapper has still has to load the image.  Sure I
> > > can get the REQUEST_URL, but if I just set that as the img src, it'll
> > > just trigger the handler again.
> > >
> > > So I whipped up a second CGI scipt that can be passed a URI and will
> > > fetch the file off the drive directly, and basicly cat it with the right
> > > Content-type header.
> > >
> > > This was just a 5 minute thought that I threw together.  I was wondering
> > > if anyone has any pointers to other ways this has been done?
> > >
> > > Thanks.
> > >
> > > --
> > > Chris
> > >
> > >
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> >
> >
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> >
> >
> 
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