diff --git a/src/api/java/appeng/api/features/IInscriberRegistry.java b/src/api/java/appeng/api/features/IInscriberRegistry.java
index 0d535e78..330dc4de 100644
--- a/src/api/java/appeng/api/features/IInscriberRegistry.java
+++ b/src/api/java/appeng/api/features/IInscriberRegistry.java
@@ -1,10 +1,15 @@
+
 package appeng.api.features;
 
 
+import java.util.Collection;
 import java.util.List;
 import java.util.Set;
+
 import javax.annotation.Nonnull;
 
+import com.google.common.base.Optional;
+
 import net.minecraft.item.ItemStack;
 
 
@@ -12,22 +17,26 @@ import net.minecraft.item.ItemStack;
  * Lets you manipulate Inscriber Recipes, by adding or editing existing ones.
  *
  * @author thatsIch
- * @version rv2
+ * @version rv3
  * @since rv2
  */
 public interface IInscriberRegistry
 {
 	/**
-	 * Current list of registered recipes, you can modify this if you want too.
-	 * Will never contain a null recipe
+	 * An immutable copy of currently registered recipes.
+	 *
+	 * Use the provided methods to actually modify the inscriber recipes.
+	 *
+	 * @see IInscriberRegistry#addRecipe(IInscriberRecipe)
+	 * @see IInscriberRegistry#removeRecipe(IInscriberRecipe)
 	 *
 	 * @return currentlyRegisteredRecipes
 	 */
 	@Nonnull
-	List<IInscriberRecipe> getRecipes();
+	Collection<IInscriberRecipe> getRecipes();
 
 	/**
-	 * Optional items which are used in the top or bottom slot
+	 * Optional items which are used in the top or bottom slot.
 	 *
 	 * @return set of all optional items
 	 */
@@ -35,7 +44,7 @@ public interface IInscriberRegistry
 	Set<ItemStack> getOptionals();
 
 	/**
-	 * Get all registered items which are valid inputs
+	 * Get all registered items which are valid inputs.
 	 *
 	 * @return set of all input items
 	 */
@@ -43,7 +52,7 @@ public interface IInscriberRegistry
 	Set<ItemStack> getInputs();
 
 	/**
-	 * Extensible way to create an inscriber recipe
+	 * Extensible way to create an inscriber recipe.
 	 *
 	 * @return builder for inscriber recipes
 	 */
@@ -61,9 +70,10 @@ public interface IInscriberRegistry
 	void addRecipe( IInscriberRecipe recipe );
 
 	/**
-	 * Removes a recipe from the registry
+	 * Removes all equal recipes from the registry.
 	 *
-	 * @param toBeRemovedRecipe to be removed recipe, can be null, makes just no sense
+	 * @param toBeRemovedRecipe to be removed recipe, can be null, makes just no sense.
 	 */
 	void removeRecipe( IInscriberRecipe toBeRemovedRecipe );
+
 }
diff --git a/src/main/java/appeng/core/features/registries/InscriberRegistry.java b/src/main/java/appeng/core/features/registries/InscriberRegistry.java
index 6915cc7b..e7a38407 100644
--- a/src/main/java/appeng/core/features/registries/InscriberRegistry.java
+++ b/src/main/java/appeng/core/features/registries/InscriberRegistry.java
@@ -1,8 +1,27 @@
+/*
+ * This file is part of Applied Energistics 2.
+ * Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
+ *
+ * Applied Energistics 2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Applied Energistics 2 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
+ */
+
 package appeng.core.features.registries;
 
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
@@ -21,12 +40,12 @@ import appeng.core.features.registries.entries.InscriberRecipe;
 
 /**
  * @author thatsIch
- * @version rv2
+ * @version rv3
  * @since rv2
  */
 public final class InscriberRegistry implements IInscriberRegistry
 {
-	private final List<IInscriberRecipe> recipes;
+	private final Set<IInscriberRecipe> recipes;
 	private final Set<ItemStack> optionals;
 	private final Set<ItemStack> inputs;
 
@@ -34,14 +53,14 @@ public final class InscriberRegistry implements IInscriberRegistry
 	{
 		this.inputs = new HashSet<ItemStack>();
 		this.optionals = new HashSet<ItemStack>();
-		this.recipes = new ArrayList<IInscriberRecipe>();
+		this.recipes = new HashSet<IInscriberRecipe>();
 	}
 
 	@Nonnull
 	@Override
-	public List<IInscriberRecipe> getRecipes()
+	public Collection<IInscriberRecipe> getRecipes()
 	{
-		return this.recipes;
+		return Collections.unmodifiableCollection( this.recipes );
 	}
 
 	@Nonnull
@@ -168,11 +187,11 @@ public final class InscriberRegistry implements IInscriberRegistry
 			{
 				throw new IllegalStateException( "Output must be defined." );
 			}
-			if ( this.topOptional == null && this.bottomOptional == null )
+			if( this.topOptional == null && this.bottomOptional == null )
 			{
 				throw new IllegalStateException( "One optional must be defined." );
 			}
-			if ( this.type == null )
+			if( this.type == null )
 			{
 				throw new IllegalStateException( "Process type must be defined." );
 			}