Apart from what F-ES Sitecore has said, your users can always take screenshots of the file if you lock other options like mouse right-click or�

Use some PDF viewer to avoid it downloadable. Google Viewer for instance. Example:� Apart from what F-ES Sitecore has said, your users can always take screenshots of the file if you lock other options like mouse right-click or� Learn how to embed PDF documents in HTML using the a and iframes tags, and

How to disable downloading of the PDF document