--- loncom/interface/lonprintout.pm	2016/12/06 03:46:09	1.627.2.19
+++ loncom/interface/lonprintout.pm	2018/04/29 16:21:07	1.627.2.22
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Printout
 #
-# $Id: lonprintout.pm,v 1.627.2.19 2016/12/06 03:46:09 raeburn Exp $
+# $Id: lonprintout.pm,v 1.627.2.22 2018/04/29 16:21:07 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -890,7 +890,7 @@ sub include_pdf {
     my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'};
     $file =~ s{(.*)/res/}{$londocroot/res/};
 
-    open(FILE,">>$Apache::lonnet::perlvar{'lonPrtDir'}/$env{'user.name'}_$env{'user.domain'}_printout.dat");
+    open(FILE,">>","$Apache::lonnet::perlvar{'lonPrtDir'}/$env{'user.name'}_$env{'user.domain'}_printout.dat");
     print FILE ("$file\n");
     close (FILE);
 
@@ -3454,7 +3454,13 @@ ENDPART
 	$URLback=$helper->{'VARS'}->{'filename'};
     } elsif ($helper->{VARS}{'symb'}) {
         my ($map, $id, $url) = &Apache::lonnet::decode_symb($helper->{VARS}{'symb'});
-        $URLback = &Apache::lonnet::clutter($url);
+        $url = &Apache::lonnet::clutter($url);
+        if ($env{'request.enc'}) {
+            $url = &Apache::lonenc::encrypted($url);
+        }
+        if ($url ne '') {
+            $URLback = $url.(($url =~ /\?/) ? '&':'?').'symb='.$helper->{VARS}{'symb'};
+        }
     }
     #
     # Final adjustment of the font size:
@@ -3538,7 +3544,7 @@ ENDPART
 				'cgi.'.$identifier.'.role' => $perm{'pav'},
 				'cgi.'.$identifier.'.numberoffiles' => $#print_array,
 				'cgi.'.$identifier.'.studentnames' => $student_names,
-				'cgi.'.$identifier.'.backref' => $URLback,});
+				'cgi.'.$identifier.'.backref' => &escape($URLback),});
     &Apache::lonnet::appenv({"cgi.$identifier.user"    => $env{'user.name'},
 				"cgi.$identifier.domain"  => $env{'user.domain'},
 				"cgi.$identifier.courseid" => $cnum,