diff --git a/src/Umbraco.Web.UI.Client/src/views/common/overlays/contenttypeeditor/compositions/compositions.html b/src/Umbraco.Web.UI.Client/src/views/common/overlays/contenttypeeditor/compositions/compositions.html
index e82aeb839c..31f47702e1 100644
--- a/src/Umbraco.Web.UI.Client/src/views/common/overlays/contenttypeeditor/compositions/compositions.html
+++ b/src/Umbraco.Web.UI.Client/src/views/common/overlays/contenttypeeditor/compositions/compositions.html
@@ -21,7 +21,7 @@
 </umb-empty-state>
 
 <ul class="umb-checkbox-list">
-   <li class="umb-checkbox-list__item" ng-repeat="compositeContentType in model.availableCompositeContentTypes | filter:searchTerm" ng-class="{ '-selected': model.compositeContentTypes.indexOf(compositeContentType.alias)+1, '-disabled': compositeContentType.metaData.compositionIsInheritedFromAncestors }">
+   <li class="umb-checkbox-list__item" ng-repeat="compositeContentType in model.availableCompositeContentTypes | filter:searchTerm" ng-class="{ '-selected': model.compositeContentTypes.indexOf(compositeContentType.alias)+1, '-disabled': model.lockedCompositeContentTypes.indexOf(compositeContentType.alias)+1 }">
 
       <div class="umb-checkbox-list__item-checkbox" ng-class="{ '-selected': model.compositeContentTypes.indexOf(compositeContentType.alias)+1 }">
          <input type="checkbox"
diff --git a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
index aa518b1bb6..1f4523661a 100644
--- a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
+++ b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
@@ -132,21 +132,12 @@ namespace Umbraco.Web.Editors
                     if (parent != null)
                         ancestorIds = parent.Path.Split(',').Select(int.Parse).ToArray();
                 }
-                
-                // add all ancestors as compositions (since they are implicitly compositions by inheritance)
+
+                // add all ancestors as compositions (since they are implicitly "compositions" by inheritance and should
+                // be in the list even though they can't be deselected)
                 foreach (var x in allContentTypes)
                     if (ancestorIds.Contains(x.Id))
                         list.Add(x);
-
-                // get the ids of compositions that are inherited from ancestors and add metadata to those compositions
-                var inheritedFromAncestorsIds = usableContentTypes.Select(x => x.Id) // those we can use
-                    .Except(indirectContentTypes.Select(x => x.Id)) // except those that are indirectly used
-                    .Where(x => ancestorIds.Contains(x) == false) // but not the parents
-                    .Distinct()
-                    .ToArray();
-                foreach (var x in list)
-                    if (inheritedFromAncestorsIds.Contains(x.Id) == false)
-                        x.AdditionalData["compositionIsInheritedFromAncestors"] = true;
             }
             return list
                 .Where(x => x.Id != contentTypeId)
diff --git a/src/Umbraco.Web/Models/ContentEditing/ContentTypeCompositionDisplay.cs b/src/Umbraco.Web/Models/ContentEditing/ContentTypeCompositionDisplay.cs
index 9a138dd828..5f6e2c5ce5 100644
--- a/src/Umbraco.Web/Models/ContentEditing/ContentTypeCompositionDisplay.cs
+++ b/src/Umbraco.Web/Models/ContentEditing/ContentTypeCompositionDisplay.cs
@@ -44,6 +44,10 @@ namespace Umbraco.Web.Models.ContentEditing
         [DataMember(Name = "compositeContentTypes")]
         public IEnumerable<string> CompositeContentTypes { get; set; }
         
+        //Locked compositions
+        [DataMember(Name = "lockedCompositeContentTypes")]
+        public IEnumerable<string> LockedCompositeContentTypes { get; set; }
+
         [DataMember(Name = "allowAsRoot")]
         public bool AllowAsRoot { get; set; }
 
diff --git a/src/Umbraco.Web/Models/Mapping/ContentTypeModelMapperExtensions.cs b/src/Umbraco.Web/Models/Mapping/ContentTypeModelMapperExtensions.cs
index e59a474afb..a6a7e79942 100644
--- a/src/Umbraco.Web/Models/Mapping/ContentTypeModelMapperExtensions.cs
+++ b/src/Umbraco.Web/Models/Mapping/ContentTypeModelMapperExtensions.cs
@@ -81,6 +81,10 @@ namespace Umbraco.Web.Models.Mapping
                     dto => dto.CompositeContentTypes,
                     expression => expression.MapFrom(dto => dto.ContentTypeComposition))
 
+                .ForMember(
+                    dto => dto.LockedCompositeContentTypes,
+                    expression => expression.ResolveUsing(new LockedCompositionsResolver(applicationContext)))
+
                 .ForMember(
                     dto => dto.Groups,
                     expression => expression.ResolveUsing(new PropertyTypeGroupResolver(applicationContext, propertyEditorResolver)));
diff --git a/src/Umbraco.Web/Models/Mapping/EntityModelMapper.cs b/src/Umbraco.Web/Models/Mapping/EntityModelMapper.cs
index f73d7daef1..5610a70008 100644
--- a/src/Umbraco.Web/Models/Mapping/EntityModelMapper.cs
+++ b/src/Umbraco.Web/Models/Mapping/EntityModelMapper.cs
@@ -72,8 +72,8 @@ namespace Umbraco.Web.Models.Mapping
             config.CreateMap<IContentTypeComposition, EntityBasic>()
                 .ForMember(basic => basic.Path, expression => expression.MapFrom(x => x.Path))
                 .ForMember(basic => basic.ParentId, expression => expression.MapFrom(x => x.ParentId))
-                .ForMember(dto => dto.Trashed, expression => expression.Ignore());
-                //.ForMember(x => x.AdditionalData, expression => expression.Ignore());
+                .ForMember(dto => dto.Trashed, expression => expression.Ignore())
+                .ForMember(x => x.AdditionalData, expression => expression.Ignore());
 
             config.CreateMap<SearchResult, EntityBasic>()
                 //default to document icon
diff --git a/src/Umbraco.Web/Models/Mapping/LockedCompositionsResolver.cs b/src/Umbraco.Web/Models/Mapping/LockedCompositionsResolver.cs
new file mode 100644
index 0000000000..435947c5de
--- /dev/null
+++ b/src/Umbraco.Web/Models/Mapping/LockedCompositionsResolver.cs
@@ -0,0 +1,36 @@
+using AutoMapper;
+using System.Collections.Generic;
+using System.Linq;
+using Umbraco.Core;
+using Umbraco.Core.Models;
+
+namespace Umbraco.Web.Models.Mapping
+{
+    internal class LockedCompositionsResolver : ValueResolver<IContentTypeComposition, IEnumerable<string>>
+    {
+        private readonly ApplicationContext _applicationContext;
+
+        public LockedCompositionsResolver(ApplicationContext applicationContext)
+        {
+            _applicationContext = applicationContext;
+        }
+
+        protected override IEnumerable<string> ResolveCore(IContentTypeComposition source)
+        {
+            // get ancestor ids from path (exclude current node id)
+            var ancestorIds = source.Path.Substring(0, source.Path.LastIndexOf(',')).Split(',').Select(int.Parse);
+            var aliases = new List<string>();
+            // loop through all content types and return ordered aliases of ancestors
+            var allContentTypes = _applicationContext.Services.ContentTypeService.GetAllContentTypes().ToArray();
+            foreach (var ancestorId in ancestorIds)
+            {
+                var ancestor = allContentTypes.FirstOrDefault(x => x.Id == ancestorId);
+                if (ancestor != null)
+                {
+                    aliases.Add(ancestor.Alias);
+                }
+            }
+            return aliases.OrderBy(x => x);
+        }
+    }
+}
diff --git a/src/Umbraco.Web/Trees/ContentTypeTreeController.cs b/src/Umbraco.Web/Trees/ContentTypeTreeController.cs
index b6a0bfab66..5bb8695f9b 100644
--- a/src/Umbraco.Web/Trees/ContentTypeTreeController.cs
+++ b/src/Umbraco.Web/Trees/ContentTypeTreeController.cs
@@ -65,7 +65,6 @@ namespace Umbraco.Web.Trees
 
             var enableInheritedDocumentTypes = UmbracoConfig.For.UmbracoSettings().Content.EnableInheritedDocumentTypes;
 
-
             if (id == Constants.System.Root.ToInvariantString())
             {
                 //set the default to create
diff --git a/src/Umbraco.Web/Umbraco.Web.csproj b/src/Umbraco.Web/Umbraco.Web.csproj
index 89780c9aae..f41ad00cba 100644
--- a/src/Umbraco.Web/Umbraco.Web.csproj
+++ b/src/Umbraco.Web/Umbraco.Web.csproj
@@ -309,6 +309,7 @@
     <Compile Include="Models\ContentEditing\PropertyTypeBasic.cs" />
     <Compile Include="Models\ContentEditing\SimpleNotificationModel.cs" />
     <Compile Include="Models\Mapping\ContentTypeModelMapperExtensions.cs" />
+    <Compile Include="Models\Mapping\LockedCompositionsResolver.cs" />
     <Compile Include="Models\PublishedContentWithKeyBase.cs" />
     <Compile Include="Mvc\IRenderController.cs" />
     <Compile Include="Mvc\RenderIndexActionSelectorAttribute.cs" />