add a copyright blurb

salsa.c

@@ -1,3 +1,17 @@
+/* Copyright 2005 Red Hat, Inc.
+ *
+ * Portions extraced from various ALSA code:
+ *  Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
+ *                   Jaroslav Kysela <perex@suse.cz>
+ *
+ * This software may be freely redistributed under the terms of the GNU
+ * public license.
+ *
+ * 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.
+ *
+ */
 
 #include <stdio.h>
 #include <stdlib.h>