diff --git a/apps/documenteditor/embed/js/ApplicationController.js b/apps/documenteditor/embed/js/ApplicationController.js
index 39ec087608..33838312f6 100644
--- a/apps/documenteditor/embed/js/ApplicationController.js
+++ b/apps/documenteditor/embed/js/ApplicationController.js
@@ -676,15 +676,22 @@ DE.ApplicationController = new(function(){
 
     function onAdvancedOptions(type, advOptions, mode, formatOptions) {
         if (type == Asc.c_oAscAdvancedOptionsID.DRM) {
+            var isCustomLoader = !!config.customization.loaderName || !!config.customization.loaderLogo;
             var submitPassword = function(val) {
                 api && api.asc_setAdvancedOptions(Asc.c_oAscAdvancedOptionsID.DRM, new Asc.asc_CDRMAdvancedOptions(val)); 
                 me.loadMask && me.loadMask.show();
-                $('#loading-mask').addClass("end-animation");
-                $('#loading-mask').removeClass("none-animation");
+                if(!isCustomLoader) {
+                    $('#loading-mask').addClass("end-animation");
+                    $('#loading-mask').removeClass("none-animation");
+                }
             };
             common.controller.modals.createDlgPassword(submitPassword);
-            $('#loading-mask').removeClass("end-animation");
-            $('#loading-mask').addClass("none-animation");
+            if(isCustomLoader) {
+                hidePreloader();
+            } else {
+                $('#loading-mask').removeClass("end-animation");
+                $('#loading-mask').addClass("none-animation");
+            }
             onLongActionEnd(Asc.c_oAscAsyncActionType['BlockInteraction'], LoadingDocument);
         }
     }
diff --git a/apps/presentationeditor/embed/js/ApplicationController.js b/apps/presentationeditor/embed/js/ApplicationController.js
index db9ff172b6..474cf8d534 100644
--- a/apps/presentationeditor/embed/js/ApplicationController.js
+++ b/apps/presentationeditor/embed/js/ApplicationController.js
@@ -547,13 +547,15 @@ PE.ApplicationController = new(function(){
 
     function onAdvancedOptions(type, advOptions, mode, formatOptions) {
         if (type == Asc.c_oAscAdvancedOptionsID.DRM) {
+            var isCustomLoader = !!config.customization.loaderName || !!config.customization.loaderLogo;
             var submitPassword = function(val) {
                 api && api.asc_setAdvancedOptions(Asc.c_oAscAdvancedOptionsID.DRM, new Asc.asc_CDRMAdvancedOptions(val)); 
                 me.loadMask && me.loadMask.show();
-                $('#loading-mask').removeClass("none-animation");
+                if(!isCustomLoader) $('#loading-mask').removeClass("none-animation");
             };
             common.controller.modals.createDlgPassword(submitPassword);
-            $('#loading-mask').addClass("none-animation");
+            if(isCustomLoader) hidePreloader();
+            else $('#loading-mask').addClass("none-animation");
             onLongActionEnd(Asc.c_oAscAsyncActionType['BlockInteraction'], LoadingDocument);
         }
     }
diff --git a/apps/spreadsheeteditor/embed/js/ApplicationController.js b/apps/spreadsheeteditor/embed/js/ApplicationController.js
index 6c0f89e19a..984a1d0d2c 100644
--- a/apps/spreadsheeteditor/embed/js/ApplicationController.js
+++ b/apps/spreadsheeteditor/embed/js/ApplicationController.js
@@ -461,13 +461,15 @@ SSE.ApplicationController = new(function(){
 
     function onAdvancedOptions(type, advOptions, mode, formatOptions) {
         if (type == Asc.c_oAscAdvancedOptionsID.DRM) {
+            var isCustomLoader = !!config.customization.loaderName || !!config.customization.loaderLogo;
             var submitPassword = function(val) {
                 api && api.asc_setAdvancedOptions(Asc.c_oAscAdvancedOptionsID.DRM, new Asc.asc_CDRMAdvancedOptions(val)); 
                 me.loadMask && me.loadMask.show();
-                $('#loading-mask').removeClass("none-animation");
+                if(!isCustomLoader) $('#loading-mask').removeClass("none-animation");
             };
             common.controller.modals.createDlgPassword(submitPassword);
-            $('#loading-mask').addClass("none-animation");
+            if(isCustomLoader) hidePreloader();
+            else $('#loading-mask').addClass("none-animation");
             onLongActionEnd(Asc.c_oAscAsyncActionType['BlockInteraction'], LoadingDocument);
         }
     }