diff --git a/openslides/mediafiles/serializers.py b/openslides/mediafiles/serializers.py
index 368404485..3eacc057b 100644
--- a/openslides/mediafiles/serializers.py
+++ b/openslides/mediafiles/serializers.py
@@ -3,6 +3,7 @@ import mimetypes
 from django.conf import settings
 from django.db import models as dbmodels
 from PyPDF2 import PdfFileReader
+from PyPDF2.utils import PdfReadError
 
 from ..utils.rest_api import FileField, ModelSerializer, SerializerMethodField
 from .models import Mediafile
@@ -29,6 +30,10 @@ class AngularCompatibleFileField(FileField):
             except FileNotFoundError:
                 # File was deleted from server. Set 'pages' to 0.
                 result['pages'] = 0
+            except PdfReadError:
+                # File could be encrypted but not be detected by PyPDF.
+                result['pages'] = 0
+                result['encrypted'] = True
         return result
 
 
diff --git a/openslides/mediafiles/static/js/mediafiles/base.js b/openslides/mediafiles/static/js/mediafiles/base.js
index 736644988..534877d55 100644
--- a/openslides/mediafiles/static/js/mediafiles/base.js
+++ b/openslides/mediafiles/static/js/mediafiles/base.js
@@ -53,7 +53,7 @@ angular.module('OpenSlidesApp.mediafiles', [])
                     return _.includes(VIDEO_FILE_TYPES, filetype);
                 }],
                 is_presentable: ['is_pdf', 'is_image', 'is_video', function (is_pdf, is_image, is_video) {
-                    return is_pdf || is_image || is_video;
+                    return (is_pdf && !this.mediafile.encrypted) || is_image || is_video;
                 }],
                 mediafileUrl: [function () {
                     return this.media_url_prefix + this.mediafile.name;
diff --git a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
index a33805e95..cf9f5515f 100644
--- a/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
+++ b/openslides/mediafiles/static/templates/mediafiles/mediafile-list.html
@@ -233,7 +233,9 @@
         <!-- mediafile data colums -->
         <td ng-mouseover="mediafile.hover=true" ng-mouseleave="mediafile.hover=false">
           <strong><a ng-href="{{ mediafile.mediafileUrl }}" target="_blank">{{ mediafile.title_or_filename }}</a></strong>
-          <br><small><i class="fa fa-file"></i> {{ mediafile.filetype }}</small>
+          <br><small><i class="fa fa-file"></i> {{ mediafile.filetype }}
+            <span ng-if="mediafile.mediafile.encrypted">(<translate>Encrypted</translate>)</span>
+          </small>
           <br><small><i class="fa fa-database"></i> {{ mediafile.filesize }}</small>
           <span ng-if="mediafile.private"><br><small><i class="fa fa-lock"></i> <translate>Private</translate></small></span>
           <div os-perms="mediafiles.can_manage" class="hoverActions" ng-class="{'hiddenDiv': !mediafile.hover}">