title: pdf.js and protected files not otherwise viewable
body: <p>I am using the PDF.js library to display PDf files within my site (using the pdf_viewer.js to display documents on-screen), but the PDF files I am displaying are confidential and I need to be able to show them within the site but block non-authorized public folks from being able to view the same files just by typing in theie URLs and seeing them show up right in their browser.</p>
  
  <p>I tried to add the Deny from all line in my htaccess file, but that also of courfse blocked the viewer from showing the docs, so that seems to be a no-go.  Clearly anyone could simply look at inspector and see the pdf file that is being read by the viewer, so it seems a direct URL is not going to be secure in any way.</p>
  
  <p>I did read about PDF.js being able to read binary data, but I have no knowledge of how I might read in a PDF in my own file system and prep it for use by the library, eveen if that means it is all a bit slower in loading to get the file contents and prep it on the fly.</p>
  
  <p>Anyone have a solution that allows PDFJS to work without revealing the source PDF URL, or to otherwise read the file using local file calls?</p>