more license/copyright header updates (thanks Ian!)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6618 65c4cc65-6c06-0410-ace0-fbb531ad65f3

plc.c

@@ -1,7 +1,5 @@
 /*
- * SpanDSP - a series of DSP components for telephony
- *
- * plc.c
+ * Asterisk -- An open source telephony toolkit.
  *
  * Written by Steve Underwood <steveu@coppice.org>
  *
@@ -9,24 +7,27 @@
  *
  * All rights reserved.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
  *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
  *
  * This version may be optionally licenced under the GNU LGPL licence.
+ *
  * This version is disclaimed to DIGIUM for inclusion in the Asterisk project.
  */
 
+/*
+ *
+ * SpanDSP - a series of DSP components for telephony
+ *
+ */
+
 /*! \file */
 
 #include <stdio.h>