On Mar 9, 2010, at 9:35 AM, David kerber wrote:
Caldarale, Charles R wrote:
From: André Warnier [mailto:a...@ice-sa.com]
Subject: Re: Secured photo rendering
But it should not, if the server sends the image with the
appropriate
"no caching" and/or "expires" HTTP headers.
The headers don't matter, since the client has the image in hand.
Browsers, for example, allow a right-click to save the image,
regardless of the caching state.
I've seen javascript used to prevent right-clicking to save the
image, but nothing can prevent them from taking a screen shot.
When I use the DVD Player from Apple, I cannot take a screenshot even
if I click myself to the Finder first. So there is something already
in practice that prevents from taking a screenshot :-)
Now how one would set such headers easily in Tomcat for static
documents, that I don't know.
Filters - but it won't help.
- Chuck
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