diff --git a/app/assets/javascripts/discourse/views/topic_view.js b/app/assets/javascripts/discourse/views/topic_view.js
index 4664d579ae3..b4b717eb3a9 100644
--- a/app/assets/javascripts/discourse/views/topic_view.js
+++ b/app/assets/javascripts/discourse/views/topic_view.js
@@ -11,7 +11,7 @@ Discourse.TopicView = Discourse.View.extend(Discourse.Scrolling, {
   templateName: 'topic',
   topicBinding: 'controller.content',
   userFiltersBinding: 'controller.userFilters',
-  classNameBindings: ['controller.multiSelect:multi-select', 'topic.archetype'],
+  classNameBindings: ['controller.multiSelect:multi-select', 'topic.archetype', 'topic.category.secure:secure_category'],
   siteBinding: 'Discourse.site',
   progressPosition: 1,
   menuVisible: true,
diff --git a/app/assets/stylesheets/application/topic-post.css.scss b/app/assets/stylesheets/application/topic-post.css.scss
index e03e18ef28c..5420671ca5f 100644
--- a/app/assets/stylesheets/application/topic-post.css.scss
+++ b/app/assets/stylesheets/application/topic-post.css.scss
@@ -789,3 +789,17 @@
     content: "\f0e0";
   }
 }
+
+
+.secure_category .gutter {
+  position: relative;
+  &:before {
+    display: block;
+    position: absolute;
+    top: 0;
+    left: 0;
+    color: rgba($black, 0.05);
+    font: 90px/1 FontAwesome;
+    content: "\f0c0";
+  }
+}
diff --git a/app/serializers/basic_category_serializer.rb b/app/serializers/basic_category_serializer.rb
index ace9b75d8fc..1ef1907448a 100644
--- a/app/serializers/basic_category_serializer.rb
+++ b/app/serializers/basic_category_serializer.rb
@@ -8,6 +8,7 @@ class BasicCategorySerializer < ApplicationSerializer
              :topic_count,
              :description,
              :topic_url,
-             :hotness
+             :hotness,
+             :secure
 
 end
diff --git a/app/serializers/topic_view_serializer.rb b/app/serializers/topic_view_serializer.rb
index 843fdb44a1a..cfbc5877ecc 100644
--- a/app/serializers/topic_view_serializer.rb
+++ b/app/serializers/topic_view_serializer.rb
@@ -128,6 +128,7 @@ class TopicViewSerializer < ApplicationSerializer
   def categoryName
     object.topic.category.name
   end
+
   def include_categoryName?
     object.topic.category.present?
   end