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diff --git a/core/src/main/java/com/att/cadi/UserChain.java b/core/src/main/java/com/att/cadi/UserChain.java
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+++ b/core/src/main/java/com/att/cadi/UserChain.java
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+/*******************************************************************************
+ * ============LICENSE_START====================================================
+ * * org.onap.aai
+ * * ===========================================================================
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * * Copyright © 2017 Amdocs
+ * * ===========================================================================
+ * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * * 
+ *  * Unless required by applicable law or agreed to in writing, software
+ * * distributed under the License is distributed on an "AS IS" BASIS,
+ * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * * See the License for the specific language governing permissions and
+ * * limitations under the License.
+ * * ============LICENSE_END====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+package com.att.cadi;
+
+/**
+ * Interface to add a User Chain String to Principal
+ * 
+ * 
+ * 
+ *  Where
+ *  APP is name suitable for Logging (i.e. official App Acronym) 
+ *  ID is official User or MechID, best if includes Identity Source (i.e. ab1234@csp.att.com)
+ *  Protocol is the Security protocol,
+ *  
+ *  Format:<ID>:<APP>:<protocol>[:AS][,<ID>:<APP>:<protocol>]*
+ *  
+ * 
+ *
+ */
+public interface UserChain  {
+	public enum Protocol {BasicAuth,Cookie,Cert,OAuth};
+	public String userChain();
+}