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diff --git a/src/main/java/com/lowagie/text/pdf/PdfLayerMembership.java b/src/main/java/com/lowagie/text/pdf/PdfLayerMembership.java
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+/*
+ * Copyright 2004 by Paulo Soares.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version 1.1
+ * (the "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the License.
+ *
+ * The Original Code is 'iText, a free JAVA-PDF library'.
+ *
+ * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
+ * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
+ * All Rights Reserved.
+ * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
+ * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
+ *
+ * Contributor(s): all the names of the contributors are added in the source code
+ * where applicable.
+ *
+ * Alternatively, the contents of this file may be used under the terms of the
+ * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
+ * provisions of LGPL are applicable instead of those above.  If you wish to
+ * allow use of your version of this file only under the terms of the LGPL
+ * License and not to allow others to use your version of this file under
+ * the MPL, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the LGPL.
+ * If you do not delete the provisions above, a recipient may use your version
+ * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MPL as stated above or under the terms of the GNU
+ * Library General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or any later version.
+ *
+ * This library 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 Library general Public License for more
+ * details.
+ *
+ * If you didn't download this code from the following link, you should check if
+ * you aren't using an obsolete version:
+ * http://www.lowagie.com/iText/
+ */
+
+package com.lowagie.text.pdf;
+
+import java.util.HashSet;
+import java.util.Collection;
+
+/**
+ * Content typically belongs to a single optional content group,
+ * and is visible when the group is <B>ON</B> and invisible when it is <B>OFF</B>. To express more
+ * complex visibility policies, content should not declare itself to belong to an optional
+ * content group directly, but rather to an optional content membership dictionary
+ * represented by this class.
+ *
+ * @author Paulo Soares (psoares@consiste.pt)
+ */
+public class PdfLayerMembership extends PdfDictionary implements PdfOCG {
+    
+    /**
+     * Visible only if all of the entries are <B>ON</B>.
+     */    
+    public static PdfName ALLON = new PdfName("AllOn");
+    /**
+     * Visible if any of the entries are <B>ON</B>.
+     */    
+    public static PdfName ANYON = new PdfName("AnyOn");
+    /**
+     * Visible if any of the entries are <B>OFF</B>.
+     */    
+    public static PdfName ANYOFF = new PdfName("AnyOff");
+    /**
+     * Visible only if all of the entries are <B>OFF</B>.
+     */    
+    public static PdfName ALLOFF = new PdfName("AllOff");
+
+    PdfIndirectReference ref;
+    PdfArray members = new PdfArray();
+    HashSet layers = new HashSet();
+    
+    /**
+     * Creates a new, empty, membership layer.
+     * @param writer the writer
+     */    
+    public PdfLayerMembership(PdfWriter writer) {
+        super(PdfName.OCMD);
+        put(PdfName.OCGS, members);
+        ref = writer.getPdfIndirectReference();
+    }
+    
+    /**
+     * Gets the <CODE>PdfIndirectReference</CODE> that represents this membership layer.
+     * @return the <CODE>PdfIndirectReference</CODE> that represents this layer
+     */    
+    public PdfIndirectReference getRef() {
+        return ref;
+    }
+    
+    /**
+     * Adds a new member to the layer.
+     * @param layer the new member to the layer
+     */    
+    public void addMember(PdfLayer layer) {
+        if (!layers.contains(layer)) {
+            members.add(layer.getRef());
+            layers.add(layer);
+        }
+    }
+    
+    /**
+     * Gets the member layers.
+     * @return the member layers
+     */    
+    public Collection getLayers() {
+        return layers;
+    }
+    
+    /**
+     * Sets the visibility policy for content belonging to this
+     * membership dictionary. Possible values are ALLON, ANYON, ANYOFF and ALLOFF.
+     * The default value is ANYON.
+     * @param type the visibility policy
+     */    
+    public void setVisibilityPolicy(PdfName type) {
+        put(PdfName.P, type);
+    }
+    
+    /**
+     * Gets the dictionary representing the membership layer. It just returns <CODE>this</CODE>.
+     * @return the dictionary representing the layer
+     */    
+    public PdfObject getPdfObject() {
+        return this;
+    }
+}