Implements the print permission

src/core.js

@@ -542,6 +542,7 @@ var PDFDocument = (function PDFDocumentClosure() {
       var docInfo = {
         PDFFormatVersion: this.pdfFormatVersion,
         IsTextCopyDisabled: encrypt ? encrypt.disableTextCopy : false,
+        IsPrintDisabled: encrypt ? encrypt.disablePrint : false,
         IsAcroFormPresent: !!this.acroForm
       };
       if (this.xref.trailer.has('Info')) {

src/crypto.js

@@ -562,6 +562,7 @@ var CipherTransformFactory = (function CipherTransformFactoryClosure() {
     var userPassword = stringToBytes(dict.get('U'));
     var flags = dict.get('P');
     this.disableTextCopy = !(flags & 16);
+    this.disablePrint = !(flags & 4);
     var revision = dict.get('R');
     var encryptMetadata = algorithm == 4 &&  // meaningful when V is 4
       dict.get('EncryptMetadata') !== false; // makes true as default value

web/viewer.css

@@ -1358,6 +1358,10 @@ canvas {
     margin: 0;
   }
 
+  #viewerContainer.print-protection {
+    display: none;
+  }
+
   .page {
     float: left;
     display: none;

web/viewer.js

@@ -1360,6 +1360,20 @@ var PDFView = {
         document.getElementById('viewerContainer').classList
           .remove('copy-protection');
       }
+
+      if (info.IsPrintDisabled) {
+        if (PDFView.supportsPrinting) {
+          document.getElementById('print').classList.add('hidden');
+        }
+        document.getElementById('viewerContainer').classList
+          .add('print-protection');
+      } else {
+        if (PDFView.supportsPrinting) {
+          document.getElementById('print').classList.remove('hidden');
+        }
+        document.getElementById('viewerContainer').classList
+          .remove('print-protection');
+      }
     });
   },
 
@@ -1626,6 +1640,9 @@ var PDFView = {
   },
 
   beforePrint: function pdfViewSetupBeforePrint() {
+    if (this.documentInfo.IsPrintDisabled) {
+      return;
+    }
     if (!this.supportsPrinting) {
       var printMessage = mozL10n.get('printing_not_supported', null,
           'Warning: Printing is not fully supported by this browser.');