The best solution I see would be to keep all pdf files in a non-web
accessible location on the web server, then have all the pdf files outputed
through a script such as a php script. In php you can check the what the
REQUEST_URI is, if it isn't equal to what you were expecting which would
mean extra parameters were taken away or added then you could just have the
php script not output the pdf file since that would mean someone had been
tampering with the URI.
D
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