Side-note: I have tested the mod in FF2, IE6 and Opera8.
Joachim
A slightly disturbing development is that a freely downloadable "Pictures Toolbar" plug-in to IE7 searches out and downloads all images to several levels of link distance from any given base URL, a bit like "Web Whacker" thus rendering this sort of protection a little less reliable.
A possible weakness is that it searches for user defined filetypes. Thus if there are JPG files there, then they will be downloaded. If there are no JPG files, then it won't. I wonder if it would ever be possible to rename JPG files when adding them into Coppermine, giving them a random file extension (fixed file extensions would become known and lose their security as a result) which could then be "decoded" back to JPG at the time when a request comes in to view the images?
In other words, If I had "airplane.jpg" to upload, then when it got added to the gallery, the file (and its normal / intermediate "relatives") would be renamed and stored as "airplane.xyz" / normal_airplane.xyz" (for example). Then if the Pictures toolbar was used, the files wouldn't be found, as it no longer has the jpg file extension. However when the picture is "called" in the Gallery, the system would know to temporarilly rename the file back to "airplane.jpg" for it to be recognised by the web browser.
Just an idea. I have no idea if it is actually possible as I am not a PHP programmer, but as I always say, the stupidest suggestion is the one that never gets made.