If you can view you can print it. So unless your configures the Browser in some way to only Read-Only that is the only way to prevent printing or downloading.

Hi chaits14, as WestEnd points out, if the entire file is sent to the browser, there's usually a way to save it. However, you are correct that the built-in PDF viewer makes that very easy. If you prefer a viewer that doesn't have a download button, you can install a web application version of the viewer on your site and change what appears on the toolbar. Here's a somewhat similar thread: [https://support.mozilla.org/questions/1262019 I want to remove the pdf toolbar using HTML and CSS. Can I do that?] See also: https://github.com/mozilla/pdf.js/wiki/Setup-pdf.js-in-a-website