Remove copyright plug-in

The rules it enforces are no longer consistent with Eclipse policy for
headers.

api/etc/config/copyright-eclipse.txt

diff --git a/api/etc/config/copyright-eclipse.txt b/api/etc/config/copyright-eclipse.txt
deleted file mode 100644
index ca40603..0000000
--- a/api/etc/config/copyright-eclipse.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) YYYY Contributors to the Eclipse Foundation
- * 
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License v. 2.0, which is available at
- * http://www.eclipse.org/legal/epl-2.0.
- *
- * This Source Code may also be made available under the following Secondary
- * Licenses when the conditions for such availability set forth in the
- * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
- * version 2 with the GNU Classpath Exception, which is available at
- * https://www.gnu.org/software/classpath/license.html.
- *
- * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
- */
- 
\ No newline at end of file

api/etc/config/copyright-exclude

diff --git a/api/etc/config/copyright-exclude b/api/etc/config/copyright-exclude
deleted file mode 100755
index c31406c..0000000
--- a/api/etc/config/copyright-exclude
+++ /dev/null
@@ -1,4 +0,0 @@
-EFSL.html
-/etc/config/copyright-exclude
-/etc/config/copyright-eclipse.txt
-/etc/config/copyright-oracle.txt
\ No newline at end of file

api/etc/config/copyright-oracle.txt

diff --git a/api/etc/config/copyright-oracle.txt b/api/etc/config/copyright-oracle.txt
deleted file mode 100755
index 0bf589f..0000000
--- a/api/etc/config/copyright-oracle.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) YYYY Oracle and/or its affiliates and others.
- * All rights reserved.
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License v. 2.0, which is available at
- * http://www.eclipse.org/legal/epl-2.0.
- *
- * This Source Code may also be made available under the following Secondary
- * Licenses when the conditions for such availability set forth in the
- * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
- * version 2 with the GNU Classpath Exception, which is available at
- * https://www.gnu.org/software/classpath/license.html.
- *
- * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
- */
-

api/pom.xml

diff --git a/api/pom.xml b/api/pom.xml
index 4b7b754..85b377b 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -170,30 +170,6 @@
                 <version>3.5.5</version>
             </plugin>
 
-            <!-- Checks copyright / license headers -->
-            <plugin>
-                <groupId>org.glassfish.copyright</groupId>
-                <artifactId>glassfish-copyright-maven-plugin</artifactId>
-                <version>2.4</version>
-                <configuration>
-                    <excludeFile>etc/config/copyright-exclude</excludeFile>
-                    <!-- svn|mercurial|git - defaults to svn -->
-                    <scm>git</scm>
-                    <!-- turn on/off debugging -->
-                    <debug>false</debug>
-                    <!-- skip files not under SCM -->
-                    <scmOnly>true</scmOnly>
-                    <!-- turn off warnings -->
-                    <warn>true</warn>
-                    <!-- for use with repair -->
-                    <update>false</update>
-                    <!-- check that year is correct -->
-                    <ignoreYear>false</ignoreYear>
-                    <templateFile>etc/config/copyright-eclipse.txt</templateFile>
-                    <alternateTemplateFile>etc/config/copyright-oracle.txt</alternateTemplateFile>
-                </configuration>
-            </plugin>
-
             <!-- Creates the OSGi MANIFEST.MF file -->
             <plugin>
                 <groupId>org.apache.felix</groupId>