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From János Löbb <janos.l...@yale.edu>
Subject Re: Secured photo rendering
Date Wed, 10 Mar 2010 15:30:19 GMT

On Mar 9, 2010, at 9:35 AM, David kerber wrote:

> Caldarale, Charles R wrote:
>>> From: André Warnier [mailto:aw@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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