diff --git a/MarshalByRefProxy/MarshalByRefProxy.csproj b/MarshalByRefProxy/MarshalByRefProxy.csproj
index 085b134..19357d3 100644
--- a/MarshalByRefProxy/MarshalByRefProxy.csproj
+++ b/MarshalByRefProxy/MarshalByRefProxy.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>sn.snk</AssemblyOriginatorKeyFile>
     <Description>A library for marshalling any object by reference that do not require the object to inherit from MarshalByRefObject.</Description>
@@ -24,7 +24,7 @@
     <None Include="..\graphics\ImpromptuInterface-Icon.png" Pack="True" PackagePath="\" />
     <PackageReference Include="Dynamitey" Version="2.0.*" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)'=='net40'">
+  <ItemGroup Condition="'$(TargetFramework)'=='net46'">
     <Reference Include="Microsoft.CSharp" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
diff --git a/MarshalByRefProxy/src/EmitProxy/BuildProxy.cs b/MarshalByRefProxy/src/EmitProxy/BuildProxy.cs
index ca6db49..8c22792 100644
--- a/MarshalByRefProxy/src/EmitProxy/BuildProxy.cs
+++ b/MarshalByRefProxy/src/EmitProxy/BuildProxy.cs
@@ -30,7 +30,7 @@ namespace MarshalByRefProxy.Build
 
 
 
-#if NET40
+#if NETFRAMEWORK
     internal static class CompatHelper
     {
         public static Type GetTypeInfo(this Type type) => type;
@@ -78,7 +78,7 @@ public static TInterface RecursiveMarshalByRefAs<TInterface>(object target) wher
         }
 
 
-#if NET40
+#if NETFRAMEWORK
 
         internal class TempBuilder : IDisposable
         {
@@ -136,7 +136,12 @@ public static IDisposable WriteOutDll(string name)
         /// <param name="mainInterface">The main interface.</param>
         /// <param name="otherInterfaces">The other interfaces.</param>
         /// <returns></returns>
-        public static Type BuildType(Type contextType, Type mainInterface, params Type[] otherInterfaces)
+        public static Type BuildType(Type contextType,
+            Type mainInterface,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif
+            params Type[] otherInterfaces)
         {
             lock (TypeCacheLock)
             {
@@ -145,7 +150,11 @@ public static Type BuildType(Type contextType, Type mainInterface, params Type[]
                 Type tType;
                 if (!_typeHash.TryGetValue(tNewHash, out tType))
                 {
-                    tType = BuildTypeHelper(Builder,contextType,new[]{mainInterface}.Concat(otherInterfaces).ToArray());
+#if NETFRAMEWORK
+                    tType = BuildTypeHelper(Builder, contextType, permissions, new[]{mainInterface}.Concat(otherInterfaces).ToArray());
+#else
+                    tType = BuildTypeHelper(Builder, contextType, new[]{mainInterface}.Concat(otherInterfaces).ToArray());
+#endif
                     _typeHash[tNewHash] = tType;
                 }
 
@@ -153,8 +162,12 @@ public static Type BuildType(Type contextType, Type mainInterface, params Type[]
             }
 
         }
-
-        public static Type BuildType(Type contextType)
+        
+        public static Type BuildType(Type contextType
+#if NETFRAMEWORK
+            , System.Security.PermissionSet permissions=null
+#endif
+            )
         {
             lock (TypeCacheLock)
             {
@@ -163,7 +176,11 @@ public static Type BuildType(Type contextType)
                 Type tType;
                 if (!_typeHash.TryGetValue(tNewHash, out tType))
                 {
+#if NETFRAMEWORK
+                    tType = BuildTypeHelper(Builder, contextType, permissions, new Type[] { });
+#else
                     tType = BuildTypeHelper(Builder, contextType, new Type[] { });
+#endif
                     _typeHash[tNewHash] = tType;
                 }
 
@@ -178,7 +195,11 @@ public static Type BuildType(Type contextType)
         /// <param name="contextType">Type of the context.</param>
         /// <param name="informalInterface">The informal interface.</param>
         /// <returns></returns>
-        public static Type BuildType(Type contextType, IDictionary<string,Type> informalInterface)
+        public static Type BuildType(Type contextType, IDictionary<string,Type> informalInterface
+#if NETFRAMEWORK
+            , System.Security.PermissionSet permissions=null
+#endif
+            )
         {
             lock (TypeCacheLock)
             {
@@ -186,7 +207,12 @@ public static Type BuildType(Type contextType, IDictionary<string,Type> informal
                 Type tType;
                 if (!_typeHash.TryGetValue(tNewHash, out tType))
                 {
+#if NETFRAMEWORK
+                    tType = BuildTypeHelper(Builder, contextType, informalInterface, permissions);
+#else
                     tType = BuildTypeHelper(Builder, contextType, informalInterface);
+#endif
+
 
                     _typeHash[tNewHash] = tType;
                 }
@@ -262,15 +288,20 @@ from tType in assembly.GetTypes()
             return tSuccess;
         }
 
-        private static Type BuildTypeHelper(ModuleBuilder builder, Type contextType, IDictionary<string,Type> informalInterface)
+        private static Type BuildTypeHelper(ModuleBuilder builder, Type contextType, IDictionary<string, Type> informalInterface
+#if NETFRAMEWORK
+            , System.Security.PermissionSet permissions=null
+#endif
+           )
         {
-
-
             var tB = builder.DefineType(
                 string.Format("MarshalByRefAs_{0}_{1}", "InformalInterface", Guid.NewGuid().ToString("N")), TypeAttributes.Public | TypeAttributes.Class,
                 typeof(MarshalByRefAsProxy));
 
-
+#if NETFRAMEWORK
+            if (permissions != null)
+                tB.AddDeclarativeSecurity(System.Security.Permissions.SecurityAction.Assert, permissions);
+#endif
 
 
             foreach (var tInterface in informalInterface)
@@ -339,13 +370,23 @@ public override int GetHashCode()
             }
         }
 
-        private static Type BuildTypeHelper(ModuleBuilder builder,Type contextType,params Type[] interfaces)
+        private static Type BuildTypeHelper(ModuleBuilder builder, Type contextType,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif
+            params Type[] interfaces
+            )
         {
-
+            
             var tInterfacesMainList = interfaces.Distinct().ToArray();
             var tB = builder.DefineType(
                 string.Format("AMarshalByRefAs_{0}_{1}", tInterfacesMainList.Count() > 0 ? tInterfacesMainList.First().Name : "", Guid.NewGuid().ToString("N")), TypeAttributes.Public | TypeAttributes.Class,
                 typeof(MarshalByRefAsProxy), tInterfacesMainList);
+            
+#if NETFRAMEWORK
+            if (permissions != null)
+                tB.AddDeclarativeSecurity(System.Security.Permissions.SecurityAction.Assert, permissions);
+#endif
 
             tB.SetCustomAttribute(
                 new CustomAttributeBuilder(typeof(MarshalByRefAsProxyAttribute).GetConstructor(new[]{typeof(Type).MakeArrayType(),typeof(Type)}),
@@ -541,7 +582,7 @@ private static CustomAttributeBuilder GetAttributeBuilder(CustomAttributeData da
         private static void MakeMethod(ModuleBuilder builder,MethodInfo info, TypeBuilder typeBuilder, Type contextType, bool nonRecursive= false, bool defaultImp =true)
         {
 
-
+            
             var tEmitInfo = new MethodEmitInfo {Name = info.Name, DefaultInterfaceImplementation = defaultImp, NonRecursive = nonRecursive};
 
             var alias = info.GetCustomAttributes(typeof(AliasAttribute), false).FirstOrDefault() as AliasAttribute;
@@ -1754,7 +1795,7 @@ private static void GenerateAssembly(string name, AssemblyBuilderAccess access,
                     tName,
                     access);
 
-#if NET40
+#if NETFRAMEWORK
             if (access== AssemblyBuilderAccess.RunAndSave || access == AssemblyBuilderAccess.Save)
                 mb = ab.DefineDynamicModule("MainModule", string.Format("{0}.dll", tName.Name));
             else
diff --git a/MarshalByRefProxy/src/EmitProxy/MarshalByRefAsProxySerializationHelper.cs b/MarshalByRefProxy/src/EmitProxy/MarshalByRefAsProxySerializationHelper.cs
index de9f1e6..4db8dc1 100644
--- a/MarshalByRefProxy/src/EmitProxy/MarshalByRefAsProxySerializationHelper.cs
+++ b/MarshalByRefProxy/src/EmitProxy/MarshalByRefAsProxySerializationHelper.cs
@@ -44,10 +44,14 @@ public class MarshalByRefAsProxySerializationHelper : IObjectReference
         public object GetRealObject(StreamingContext context)
         {
 		   var tInterfaces = Interfaces ?? MonoInterfaces.Select(it=>Type.GetType(it)).ToArray();
-           var tType =BuildProxy.BuildType(Context, tInterfaces.First(), tInterfaces.Skip(1).ToArray());
-           return MarshalByRefProxy.InitializeProxy(tType, Original, tInterfaces);
+#if NETFRAMEWORK
+            var tType = BuildProxy.BuildType(Context, tInterfaces.First(), null, tInterfaces.Skip(1).ToArray());
+#else
+            var tType = BuildProxy.BuildType(Context, tInterfaces.First(), tInterfaces.Skip(1).ToArray());
+#endif
+            return MarshalByRefProxy.InitializeProxy(tType, Original, tInterfaces);
         }
-
+        
     }
 #endif
 }
diff --git a/MarshalByRefProxy/src/MarshalByRefAsCaster.cs b/MarshalByRefProxy/src/MarshalByRefAsCaster.cs
index 5a70f32..0a77e54 100644
--- a/MarshalByRefProxy/src/MarshalByRefAsCaster.cs
+++ b/MarshalByRefProxy/src/MarshalByRefAsCaster.cs
@@ -10,6 +10,9 @@ namespace MarshalByRefProxy
     public class MarshalByRefAsCaster : DynamicObject
     {
         public object Target { get; }
+#if NETFRAMEWORK
+        private System.Security.PermissionSet _permissions;
+#endif
         private List<Type> _interfaceTypes;
 
         public override bool TryConvert(System.Dynamic.ConvertBinder binder, out object result)
@@ -19,7 +22,11 @@ public override bool TryConvert(System.Dynamic.ConvertBinder binder, out object
             if (binder.Type.IsInterface)
             {
                 _interfaceTypes.Insert(0, binder.Type);
+#if NETFRAMEWORK
+                result = MarshalByRefProxy.DynamicMarshalByRefAs(Target, _permissions, _interfaceTypes.ToArray());
+#else
                 result = MarshalByRefProxy.DynamicMarshalByRefAs(Target, _interfaceTypes.ToArray());
+#endif
                 return true;
             }
 
@@ -32,9 +39,17 @@ public override bool TryConvert(System.Dynamic.ConvertBinder binder, out object
         }
 
 
-        public MarshalByRefAsCaster(object target, IEnumerable<Type> types)
+        public MarshalByRefAsCaster(object target,
+            IEnumerable<Type> types
+#if NETFRAMEWORK
+            , System.Security.PermissionSet permissions=null
+#endif 
+            )
         {
             Target = target;
+#if NETFRAMEWORK
+            _permissions = permissions;
+#endif 
             _interfaceTypes = types.ToList();
         }
 
diff --git a/MarshalByRefProxy/src/MarshalByRefProxy.cs b/MarshalByRefProxy/src/MarshalByRefProxy.cs
index cb5209c..4588b74 100644
--- a/MarshalByRefProxy/src/MarshalByRefProxy.cs
+++ b/MarshalByRefProxy/src/MarshalByRefProxy.cs
@@ -69,15 +69,22 @@ public static IEnumerable<T> AllMarshalByRef<T>(this IEnumerable<T> originalObje
         /// <param name="originalDynamic">The original object can be annoymous type, System.DynamicObject as well as any others.</param>
         /// <param name="otherInterfaces">Optional other interfaces.</param>
         /// <returns></returns>
-        public static TInterface MarshalByRefAs<TInterface>(this object originalDynamic, params Type[] otherInterfaces) where TInterface : class
+        public static TInterface MarshalByRefAs<TInterface>(this object originalDynamic,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif
+            params Type[] otherInterfaces) where TInterface : class
         {
             Type tContext;
             bool tDummy;
             originalDynamic = originalDynamic.GetTargetContext(out tContext, out tDummy);
             tContext = tContext.FixContext();
 
-            var tProxy = BuildProxy.BuildType(tContext, typeof(TInterface), otherInterfaces);
-
+#if NETFRAMEWORK
+            var tProxy = BuildProxy.BuildType(tContext, typeof(TInterface), permissions, otherInterfaces);
+#else
+            var tProxy = BuildProxy.BuildType(tContext, typeof(TInterface), otherInterfaces);   
+#endif
 
 
             return
@@ -109,9 +116,17 @@ public static dynamic UnmarshalByRef(this object proxiedObject)
         /// <param name="originalDynamic">The original dynamic.</param>
         /// <param name="otherInterfaces">The other interfaces.</param>
         /// <returns></returns>
-        public static dynamic MarshalByRefAs(this object originalDynamic, params Type[] otherInterfaces)
+        public static dynamic MarshalByRefAs(this object originalDynamic,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif 
+            params Type[] otherInterfaces)
         {
+#if NETFRAMEWORK
+            return new MarshalByRefAsCaster(originalDynamic, otherInterfaces, permissions);
+#else
             return new MarshalByRefAsCaster(originalDynamic, otherInterfaces);
+#endif
         }
 
 
@@ -132,16 +147,23 @@ public static TInterface Create<TTarget, TInterface>(params object[] args) where
         /// <param name="originalDynamic">The original dynamic.</param>
         /// <param name="propertySpec">The property spec.</param>
         /// <returns></returns>
-        public static dynamic MarshalByRefAsProperties(this object originalDynamic, IDictionary<string, Type> propertySpec)
+        public static dynamic MarshalByRefAsProperties(this object originalDynamic,
+            IDictionary<string, Type> propertySpec
+#if NETFRAMEWORK
+            , System.Security.PermissionSet permissions=null
+#endif
+            )
         {
             Type tContext;
             bool tDummy;
             originalDynamic = originalDynamic.GetTargetContext(out tContext, out tDummy);
             tContext = tContext.FixContext();
 
+#if NETFRAMEWORK
+            var tProxy = BuildProxy.BuildType(tContext, propertySpec, permissions);
+#else
             var tProxy = BuildProxy.BuildType(tContext, propertySpec);
-
-
+#endif
 
             return
                 InitializeProxy(tProxy, originalDynamic, propertySpec: propertySpec);
@@ -170,9 +192,17 @@ internal static object InitializeProxy(Type proxytype, object original, IEnumera
         /// <param name="originalDynamic">The original dynamic.</param>
         /// <param name="otherInterfaces">The other interfaces.</param>
         /// <returns></returns>
-        public static IEnumerable<TInterface> AllMarshalByRefAs<TInterface>(this IEnumerable<object> originalDynamic, params Type[] otherInterfaces) where TInterface : class
+        public static IEnumerable<TInterface> AllMarshalByRefAs<TInterface>(this IEnumerable<object> originalDynamic,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif
+            params Type[] otherInterfaces) where TInterface : class
         {
+#if NETFRAMEWORK
+            return originalDynamic.Select(it => it.MarshalByRefAs<TInterface>(permissions, otherInterfaces));
+#else
             return originalDynamic.Select(it => it.MarshalByRefAs<TInterface>(otherInterfaces));
+#endif
         }
 
         /// <summary>
@@ -181,14 +211,22 @@ public static IEnumerable<TInterface> AllMarshalByRefAs<TInterface>(this IEnumer
         /// <param name="originalDynamic">The original dynamic.</param>
         /// <param name="otherInterfaces">The other interfaces.</param>
         /// <returns></returns>
-        public static dynamic DynamicMarshalByRefAs(object originalDynamic, params Type[] otherInterfaces)
+        public static dynamic DynamicMarshalByRefAs(object originalDynamic,
+#if NETFRAMEWORK
+            System.Security.PermissionSet permissions=null,
+#endif
+            params Type[] otherInterfaces)
         {
             Type tContext;
             bool tDummy;
             originalDynamic = originalDynamic.GetTargetContext(out tContext, out tDummy);
             tContext = tContext.FixContext();
 
+#if NETFRAMEWORK
+            var tProxy = BuildProxy.BuildType(tContext, otherInterfaces.First(), permissions, otherInterfaces.Skip(1).ToArray());
+#else
             var tProxy = BuildProxy.BuildType(tContext, otherInterfaces.First(), otherInterfaces.Skip(1).ToArray());
+#endif
 
             return InitializeProxy(tProxy, originalDynamic, otherInterfaces);
 
diff --git a/README.md b/README.md
index c990158..50cf4ef 100644
--- a/README.md
+++ b/README.md
@@ -69,6 +69,15 @@ public async Task TestTask()
 ```
 Why can we await `IAwaitable`? Because C# can await any [awaitable expressions](https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/expressions#11882-awaitable-expressions), which is exactly what `IAwaitable` stands for.
 
+## Permissions (.NET Framework only)
+Assert unrestricted permissions:
+```csharp
+using System.Security;
+using System.Security.Permissions;
+
+new UnmarshallableClass().MarshalByRefAs<IProxyInterface>(new PermissionSet(PermissionState.Unrestricted));
+```
+
 ## Todos
 - [ ] `IAwaitable<T>`
 - [ ] MarshalByRefWrapper Code Generators
diff --git a/Tests/UnitTestImpromptuInterface/Basic.cs b/Tests/UnitTestImpromptuInterface/Basic.cs
index 00f860c..8d7abe8 100644
--- a/Tests/UnitTestImpromptuInterface/Basic.cs
+++ b/Tests/UnitTestImpromptuInterface/Basic.cs
@@ -183,7 +183,7 @@ public void DoubleInterfacetest()
             tNew.Prop3 = Guid.NewGuid();
             tNew.ReturnProp = new PropPoco();
 
-            IInheritProp tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IInheritProp>(tNew, typeof(ISimpeleClassProps));
+            IInheritProp tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IInheritProp>(tNew, null, typeof(ISimpeleClassProps));
 
 
 
@@ -277,7 +277,7 @@ public void DoublePropertyTest()
             tNew.Prop3 = Guid.NewGuid();
             tNew.ReturnProp = new PropPoco();
 
-            IInheritProp tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IInheritProp>(tNew, typeof(IPropPocoProp));
+            IInheritProp tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IInheritProp>(tNew, null, typeof(IPropPocoProp));
 
 
 
@@ -295,20 +295,20 @@ public void EventPropertyCollisionTest()
             dynamic tNew = new ExpandoObject();
             tNew.Event = 3;
 
-            IEventCollisions tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IEventCollisions>(tNew, typeof(IEvent));
+            IEventCollisions tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<IEventCollisions>(tNew, null, typeof(IEvent));
 
 
             Assert.AreEqual(tNew.Event, tActsLike.Event);
         }
-
+        
         [Test]
         public void InterfaceDirectDuplicateTest()
         {
 
             dynamic tNew = new ExpandoObject();
             tNew.StartsWith = new Func<string, bool>(x => true);
-
-            ISimpleStringMethod tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew, typeof(ISimpleStringMethod));
+            
+            ISimpleStringMethod tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew, null, typeof(ISimpleStringMethod));
 
 
             Assert.AreEqual(tNew.StartsWith("test"), tActsLike.StartsWith("test"));
@@ -321,12 +321,12 @@ public void MethodCollisionTest()
             dynamic tNew = new ExpandoObject();
             tNew.StartsWith = new Func<string, bool>(x => true);
 
-            ISimpleStringMethod tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew, typeof(ISimpleStringMethodCollision));
+            ISimpleStringMethod tActsLike = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew, null, typeof(ISimpleStringMethodCollision));
             Assert.AreEqual(tNew.StartsWith("test"), tActsLike.StartsWith("test"));
 
             dynamic tNew2 = new ExpandoObject();
             tNew2.StartsWith = new Func<string, int>(x => 5);
-            ISimpleStringMethodCollision tActsLike2 = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew2, typeof(ISimpleStringMethodCollision));
+            ISimpleStringMethodCollision tActsLike2 = MarshalByRefProxy.MarshalByRefProxy.MarshalByRefAs<ISimpleStringMethod>(tNew2, null, typeof(ISimpleStringMethodCollision));
 
             Assert.AreEqual(tNew2.StartsWith("test"), tActsLike2.StartsWith("test"));
         }
diff --git a/Tests/UnitTestImpromptuInterface/Support/Helper.cs b/Tests/UnitTestImpromptuInterface/Support/Helper.cs
index cfe339e..b727e7e 100644
--- a/Tests/UnitTestImpromptuInterface/Support/Helper.cs
+++ b/Tests/UnitTestImpromptuInterface/Support/Helper.cs
@@ -17,7 +17,7 @@ public void WriteLine(string format, params object[] args)
         }
     }
 
-    public class Helper:AssertionHelper
+    public class Helper : AssertionHelper
     {
         public WriteLineContext TestContext
         {
diff --git a/Version.props b/Version.props
index 1a6fc17..019cbab 100644
--- a/Version.props
+++ b/Version.props
@@ -1,5 +1,5 @@
 <Project>
     <PropertyGroup>
-        <VersionPrefix>0.2.1</VersionPrefix>
+        <VersionPrefix>0.3.0</VersionPrefix>
     </PropertyGroup>
 </Project>
\ No newline at end of file