diff --git a/lib/iaddressbook.php b/lib/iaddressbook.php
new file mode 100644
index 0000000000..3920514036
--- /dev/null
+++ b/lib/iaddressbook.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Thomas Müller
+ * @copyright 2012 Thomas Müller thomas.mueller@tmit.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 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 AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC {
+	interface IAddressBook {
+
+		/**
+		 * @return string defining the technical unique key
+		 */
+		public function getKey();
+
+		/**
+		 * In comparison to getKey() this function returns a human readable (maybe translated) name
+		 * @return mixed
+		 */
+		public function getDisplayName();
+
+		/**
+		 * @param string $pattern which should match within the $searchProperties
+		 * @param array $searchProperties defines the properties within the query pattern should match
+		 * @param array $options - for future use. One should always have options!
+		 * @return array of contacts which are arrays of key-value-pairs
+		 */
+		public function search($pattern, $searchProperties, $options);
+//			// dummy results
+//			return array(
+//				array('id' => 0, 'FN' => 'Thomas Müller', 'EMAIL' => 'a@b.c', 'GEO' => '37.386013;-122.082932'),
+//				array('id' => 5, 'FN' => 'Thomas Tanghus', 'EMAIL' => array('d@e.f', 'g@h.i')),
+//			);
+
+		/**
+		 * @param array $properties this array if key-value-pairs defines a contact
+		 * @return array representing the contact just created or updated
+		 */
+		public function createOrUpdate($properties);
+//			// dummy
+//			return array('id'    => 0, 'FN' => 'Thomas Müller', 'EMAIL' => 'a@b.c',
+//			             'PHOTO' => 'VALUE=uri:http://www.abc.com/pub/photos/jqpublic.gif',
+//			             'ADR'   => ';;123 Main Street;Any Town;CA;91921-1234'
+//			);
+
+		/**
+		 * @return mixed
+		 */
+		public function getPermissions();
+
+		/**
+		 * @param object $id the unique identifier to a contact
+		 * @return bool successful or not
+		 */
+		public function delete($id);
+	}
+}
diff --git a/lib/public/contacts.php b/lib/public/contacts.php
index ca0b15b2c7..ab46614c8f 100644
--- a/lib/public/contacts.php
+++ b/lib/public/contacts.php
@@ -26,57 +26,6 @@
  *
  */
 
-namespace OC {
-	interface IAddressBook {
-
-		/**
-		 * @return string defining the technical unique key
-		 */
-		public function getKey();
-
-		/**
-		 * In comparison to getKey() this function returns a human readable (maybe translated) name
-		 * @return mixed
-		 */
-		public function getDisplayName();
-
-		/**
-		 * @param string $pattern which should match within the $searchProperties
-		 * @param array $searchProperties defines the properties within the query pattern should match
-		 * @param array $options - for future use. One should always have options!
-		 * @return array of contacts which are arrays of key-value-pairs
-		 */
-		public function search($pattern, $searchProperties, $options);
-//			// dummy results
-//			return array(
-//				array('id' => 0, 'FN' => 'Thomas Müller', 'EMAIL' => 'a@b.c', 'GEO' => '37.386013;-122.082932'),
-//				array('id' => 5, 'FN' => 'Thomas Tanghus', 'EMAIL' => array('d@e.f', 'g@h.i')),
-//			);
-
-		/**
-		 * @param array $properties this array if key-value-pairs defines a contact
-		 * @return array representing the contact just created or updated
-		 */
-		public function createOrUpdate($properties);
-//			// dummy
-//			return array('id'    => 0, 'FN' => 'Thomas Müller', 'EMAIL' => 'a@b.c',
-//			             'PHOTO' => 'VALUE=uri:http://www.abc.com/pub/photos/jqpublic.gif',
-//			             'ADR'   => ';;123 Main Street;Any Town;CA;91921-1234'
-//			);
-
-		/**
-		 * @return mixed
-		 */
-		public function getPermissions();
-
-		/**
-		 * @param object $id the unique identifier to a contact
-		 * @return bool successful or not
-		 */
-		public function delete($id);
-	}
-}
-
 // use OCP namespace for all classes that are considered public.
 // This means that they should be used by apps instead of the internal ownCloud classes
 namespace OCP {