I need users to provide a password before they can access a pdf file. How can I prevent someone simply sending out the link to the pdf and accessing it without the password?
Assuming you have a login page, you can serve up the file to authorized users with cfcontent. Then the pdf cannot be accessed directly. You can also use CF8's pdf features to assign a password (or other permissions) to the pdf itself. Lastly, there are o/s level mechanisms you can use.
Though nothing is fool proof. Once a file is viewable in a browser users can copy it one way or another and send it anywhere they please.
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