diff --git a/apps/presentationeditor/main/app/controller/Main.js b/apps/presentationeditor/main/app/controller/Main.js
index 9412332c14..22a587dd6d 100644
--- a/apps/presentationeditor/main/app/controller/Main.js
+++ b/apps/presentationeditor/main/app/controller/Main.js
@@ -319,6 +319,7 @@ define([
                 }
 
                 this.api.asc_registerCallback('asc_onGetEditorPermissions', _.bind(this.onEditorPermissions, this));
+                this.api.asc_registerCallback('asc_onLicenseChanged',       _.bind(this.onLicenseChanged, this));
                 this.api.asc_setDocInfo(docInfo);
                 this.api.asc_getEditorPermissions(this.editorConfig.licenseUrl, this.editorConfig.customerId);
 
@@ -695,6 +696,8 @@ define([
 
                             if (me.appOptions.canBrandingExt)
                                 Common.NotificationCenter.trigger('document:ready', 'main');
+
+                            me.applyLicense();
                         }
                     }, 50);
                 } else {
@@ -715,9 +718,24 @@ define([
                 Common.Gateway.sendInfo({mode:me.appOptions.isEdit?'edit':'view'});
 
                 $(document).on('contextmenu', _.bind(me.onContextMenu, me));
+            },
 
+            onLicenseChanged: function(params) {
+                var licType = params.asc_getLicenseType();
+                if (licType !== undefined && (licType===Asc.c_oLicenseResult.Connections || licType===Asc.c_oLicenseResult.Users) && this.appOptions.canEdit && this.editorConfig.mode !== 'view') {
+                    this._state.licenseWarning = (licType===Asc.c_oLicenseResult.Connections) ? this.warnNoLicense : this.warnNoLicenseUsers;
+                }
+
+                if (this._isDocReady)
+                    this.applyLicense();
+            },
+
+            applyLicense: function() {
                 if (this._state.licenseWarning) {
-                    value = Common.localStorage.getItem("pe-license-warning");
+                    this.disableEditing(true);
+                    Common.NotificationCenter.trigger('api:disconnect');
+
+                    var value = Common.localStorage.getItem("pe-license-warning");
                     value = (value!==null) ? parseInt(value) : 0;
                     var now = (new Date).getTime();
                     if (now - value > 86400000) {
@@ -725,7 +743,7 @@ define([
                         Common.UI.info({
                             width: 500,
                             title: this.textNoLicenseTitle,
-                            msg  : this.warnNoLicense,
+                            msg  : this._state.licenseWarning,
                             buttons: [
                                 {value: 'buynow', caption: this.textBuyNow},
                                 {value: 'contact', caption: this.textContactUs}
@@ -742,6 +760,15 @@ define([
                 }
             },
 
+            disableEditing: function(disable) {
+                var app = this.getApplication();
+                if (this.appOptions.canEdit && this.editorConfig.mode !== 'view') {
+                    app.getController('RightMenu').getView('RightMenu').clearSelection();
+                    app.getController('Toolbar').DisableToolbar(disable);
+                    app.getController('Statusbar').getView('Statusbar').SetDisabled(disable);
+                }
+            },
+
             onOpenDocument: function(progress) {
                 var elem = document.getElementById('loadmask-text');
                 var proc = (progress.asc_getCurrentFont() + progress.asc_getCurrentImage())/(progress.asc_getFontsCount() + progress.asc_getImagesCount());
@@ -788,8 +815,6 @@ define([
                 this.appOptions.canEditComments= this.appOptions.isOffline || !(typeof (this.editorConfig.customization) == 'object' && this.editorConfig.customization.commentAuthorOnly);
                 this.appOptions.trialMode      = params.asc_getLicenseMode();
 
-                this._state.licenseWarning = (licType===Asc.c_oLicenseResult.Connections) && this.appOptions.canEdit && this.editorConfig.mode !== 'view';
-
                 this.appOptions.canBranding  = (licType === Asc.c_oLicenseResult.Success) && (typeof this.editorConfig.customization == 'object');
                 if (this.appOptions.canBranding)
                     appHeader.setBranding(this.editorConfig.customization);
@@ -1910,7 +1935,8 @@ define([
             textChangesSaved: 'All changes saved',
             saveTitleText: 'Saving Document',
             saveTextText: 'Saving document...',
-            txtLoading: 'Loading...'
+            txtLoading: 'Loading...',
+            warnNoLicenseUsers: 'You are using an open source version of ONLYOFFICE. The version has limitations for concurrent connections to the document server (20 connections at a time).<br>If you need more please consider purchasing a commercial license.'
         }
     })(), PE.Controllers.Main || {}))
 });
diff --git a/apps/presentationeditor/main/app/view/DocumentHolder.js b/apps/presentationeditor/main/app/view/DocumentHolder.js
index af797dd8cc..297ea9580e 100644
--- a/apps/presentationeditor/main/app/view/DocumentHolder.js
+++ b/apps/presentationeditor/main/app/view/DocumentHolder.js
@@ -217,7 +217,8 @@ define([
             var onContextMenu = function(event){
                 _.delay(function(){
                     if (event.get_Type() == Asc.c_oAscContextMenuTypes.Thumbnails) {
-                        showPopupMenu.call(me, me.slideMenu, {isSlideSelect: event.get_IsSlideSelect(), isSlideHidden: event.get_IsSlideHidden(), fromThumbs: true}, event);
+                        if (me.mode.isEdit)
+                            showPopupMenu.call(me, me.slideMenu, {isSlideSelect: event.get_IsSlideSelect(), isSlideHidden: event.get_IsSlideHidden(), fromThumbs: true}, event);
                     } else {
                         showObjectMenu.call(me, event);
                     }
diff --git a/apps/presentationeditor/main/app/view/Statusbar.js b/apps/presentationeditor/main/app/view/Statusbar.js
index 13a9ad7756..e4eb65355c 100644
--- a/apps/presentationeditor/main/app/view/Statusbar.js
+++ b/apps/presentationeditor/main/app/view/Statusbar.js
@@ -303,6 +303,7 @@ define([
                     this.api.asc_registerCallback('asc_onCountPages',   _.bind(_onCountPages, this));
                     this.api.asc_registerCallback('asc_onCurrentPage',  _.bind(_onCurrentPage, this));
                     this.api.asc_registerCallback('asc_onFocusObject', _.bind(this.onApiFocusObject, this));
+                    Common.NotificationCenter.on('api:disconnect',     _.bind(this.onApiCoAuthoringDisconnect, this));
                 }
 
                 return this;
@@ -344,7 +345,7 @@ define([
                 this.langMenu.doLayout();
                 if (this.langMenu.items.length>0) {
                     this.btnLanguage.setDisabled(false || this._state.no_paragraph);
-                    this.btnDocLanguage.setDisabled(false);
+                    this.btnDocLanguage.setDisabled(!!this.mode.isDisconnected);
                 }
             },
 
@@ -388,6 +389,11 @@ define([
                     this.btnLanguage.setDisabled(this._state.no_paragraph);
             },
 
+            onApiCoAuthoringDisconnect: function() {
+                this.setMode({isDisconnected:true});
+                this.SetDisabled(true);
+            },
+
             pageIndexText   : 'Slide {0} of {1}',
             goToPageText    : 'Go to Slide',
             tipFitPage      : 'Fit to Slide',