diff --git a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
index 48cab5a7c..b7bb9f7b0 100644
--- a/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
+++ b/ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
@@ -547,7 +547,6 @@
     <Compile Include="TypeSystem\Implementation\TypeWithElementType.cs" />
     <Compile Include="TypeSystem\Implementation\UnknownType.cs" />
     <Compile Include="TypeSystem\Implementation\UnresolvedAttributeBlob.cs" />
-    <Compile Include="TypeSystem\Implementation\UnresolvedSecurityDeclarationBlob.cs" />
     <Compile Include="TypeSystem\Implementation\VoidTypeDefinition.cs" />
     <Compile Include="TypeSystem\INamedElement.cs" />
     <Compile Include="TypeSystem\INamespace.cs" />
diff --git a/ICSharpCode.Decompiler/TypeSystem/Implementation/UnresolvedSecurityDeclarationBlob.cs b/ICSharpCode.Decompiler/TypeSystem/Implementation/UnresolvedSecurityDeclarationBlob.cs
deleted file mode 100644
index 0a4396d34..000000000
--- a/ICSharpCode.Decompiler/TypeSystem/Implementation/UnresolvedSecurityDeclarationBlob.cs
+++ /dev/null
@@ -1,149 +0,0 @@
-// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy of this
-// software and associated documentation files (the "Software"), to deal in the Software
-// without restriction, including without limitation the rights to use, copy, modify, merge,
-// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
-// to whom the Software is furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in all copies or
-// substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
-// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
-// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
-// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using ICSharpCode.Decompiler.Semantics;
-
-namespace ICSharpCode.Decompiler.TypeSystem.Implementation
-{
-	[Serializable]
-	public sealed class UnresolvedSecurityDeclarationBlob
-	{
-		static readonly ITypeReference securityActionTypeReference = typeof(System.Security.Permissions.SecurityAction).ToTypeReference();
-		static readonly ITypeReference permissionSetAttributeTypeReference = new GetClassTypeReference("System.Security.Permissions", "PermissionSetAttribute");
-		
-		readonly IConstantValue securityAction;
-		readonly byte[] blob;
-		readonly IList<IUnresolvedAttribute> unresolvedAttributes = new List<IUnresolvedAttribute>();
-		
-		public UnresolvedSecurityDeclarationBlob(int securityAction, byte[] blob)
-		{
-			BlobReader reader = new BlobReader(blob, null);
-			this.securityAction = new SimpleConstantValue(securityActionTypeReference, securityAction);
-			this.blob = blob;
-			if (reader.ReadByte() == '.') {
-				// binary attribute
-				uint attributeCount = reader.ReadCompressedUInt32();
-				for (uint i = 0; i < attributeCount; i++) {
-					unresolvedAttributes.Add(new UnresolvedSecurityAttribute(this, (int)i));
-				}
-			} else {
-				// for backward compatibility with .NET 1.0: XML-encoded attribute
-				var attr = new DefaultUnresolvedAttribute(permissionSetAttributeTypeReference);
-				attr.ConstructorParameterTypes.Add(securityActionTypeReference);
-				attr.PositionalArguments.Add(this.securityAction);
-				string xml = System.Text.Encoding.Unicode.GetString(blob);
-				attr.AddNamedPropertyArgument("XML", new SimpleConstantValue(KnownTypeReference.String, xml));
-				unresolvedAttributes.Add(attr);
-			}
-		}
-		
-		public IList<IUnresolvedAttribute> UnresolvedAttributes {
-			get { return unresolvedAttributes; }
-		}
-		
-		public IList<IAttribute> Resolve(IAssembly currentAssembly)
-		{
-			// TODO: make this a per-assembly cache
-//				CacheManager cache = currentAssembly.Compilation.CacheManager;
-//				IList<IAttribute> result = (IList<IAttribute>)cache.GetShared(this);
-//				if (result != null)
-//					return result;
-			
-			ITypeResolveContext context = new SimpleTypeResolveContext(currentAssembly);
-			BlobReader reader = new BlobReader(blob, currentAssembly);
-			if (reader.ReadByte() != '.') {
-				// should not use UnresolvedSecurityDeclaration for XML secdecls
-				throw new InvalidOperationException();
-			}
-			ResolveResult securityActionRR = securityAction.Resolve(context);
-			uint attributeCount = reader.ReadCompressedUInt32();
-			IAttribute[] attributes = new IAttribute[attributeCount];
-			try {
-				ReadSecurityBlob(reader, attributes, context, securityActionRR);
-			} catch (NotSupportedException ex) {
-				// ignore invalid blobs
-				Debug.WriteLine(ex.ToString());
-			}
-			for (int i = 0; i < attributes.Length; i++) {
-				if (attributes[i] == null)
-					attributes[i] = new CecilResolvedAttribute(context, SpecialType.UnknownType);
-			}
-			return attributes;
-//				return (IList<IAttribute>)cache.GetOrAddShared(this, attributes);
-		}
-		
-		void ReadSecurityBlob(BlobReader reader, IAttribute[] attributes, ITypeResolveContext context, ResolveResult securityActionRR)
-		{
-			for (int i = 0; i < attributes.Length; i++) {
-				string attributeTypeName = reader.ReadSerString();
-				ITypeReference attributeTypeRef = ReflectionHelper.ParseReflectionName(attributeTypeName);
-				IType attributeType = attributeTypeRef.Resolve(context);
-				
-				reader.ReadCompressedUInt32(); // ??
-				// The specification seems to be incorrect here, so I'm using the logic from Cecil instead.
-				uint numNamed = reader.ReadCompressedUInt32();
-				
-				var namedArgs = new List<KeyValuePair<IMember, ResolveResult>>((int)numNamed);
-				for (uint j = 0; j < numNamed; j++) {
-					var namedArg = reader.ReadNamedArg(attributeType);
-					if (namedArg.Key != null)
-						namedArgs.Add(namedArg);
-					
-				}
-				throw new NotImplementedException(); /*
-				attributes[i] = new DefaultAttribute(
-					attributeType,
-					positionalArguments: new ResolveResult[] { securityActionRR },
-					namedArguments: namedArgs);*/
-			}
-		}
-	}
-	
-	[Serializable]
-	sealed class UnresolvedSecurityAttribute : IUnresolvedAttribute, ISupportsInterning
-	{
-		readonly UnresolvedSecurityDeclarationBlob secDecl;
-		readonly int index;
-		
-		public UnresolvedSecurityAttribute(UnresolvedSecurityDeclarationBlob secDecl, int index)
-		{
-			Debug.Assert(secDecl != null);
-			this.secDecl = secDecl;
-			this.index = index;
-		}
-		
-		IAttribute IUnresolvedAttribute.CreateResolvedAttribute(ITypeResolveContext context)
-		{
-			return secDecl.Resolve(context.CurrentAssembly)[index];
-		}
-		
-		int ISupportsInterning.GetHashCodeForInterning()
-		{
-			return index ^ secDecl.GetHashCode();
-		}
-		
-		bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
-		{
-			UnresolvedSecurityAttribute attr = other as UnresolvedSecurityAttribute;
-			return attr != null && index == attr.index && secDecl == attr.secDecl;
-		}
-	}
-}