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I want to make a PDF reader that uses PDF files stored on my server, to let users view it. I know it's impossible to not let the user download it, but is it possible I can make it so that the file names are constantly changing or they're hidden so that the user can only view the PDF file in a small reader that lets users scroll the pages and that's all. I want to focus more on the security, i.e. hiding my PDFs on my server so that they can only view it.