diff --git a/Copyright b/Copyright
index c71ee4c0ad..004e0bf1c8 100644
--- a/Copyright
+++ b/Copyright
@@ -116,7 +116,7 @@ x   audio/audio.*                   very hard (mp_audio based of anders' af_audi
     audio/chmap.*                   LGPL
     audio/chmap_sel.*               LGPL
     audio/fmt-conversion.*          LGPL
-x   audio/format.*                  hard (murky libaf origins)
+    audio/format.*                  LGPL
     common/av_common.*              LGPL
     common/av_log.c                 almost LGPL
     common/av_log.h                 LGPL
diff --git a/audio/format.c b/audio/format.c
index bbe0cec9bb..efbb605d98 100644
--- a/audio/format.c
+++ b/audio/format.c
@@ -3,26 +3,21 @@
  *
  * This file is part of mpv.
  *
- * mpv 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.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv 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.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <inttypes.h>
 #include <limits.h>
-#include <assert.h>
 
 #include "common/common.h"
 #include "audio/filter/af.h"
diff --git a/audio/format.h b/audio/format.h
index 3d5cc1024b..ace19da5e5 100644
--- a/audio/format.h
+++ b/audio/format.h
@@ -1,22 +1,18 @@
 /*
- * The sample format system used lin libaf is based on bitmasks.
- * The format definition only refers to the storage format,
- * not the resolution.
- *
  * This file is part of mpv.
  *
- * mpv 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.
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * mpv 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.
+ * GNU Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef MPLAYER_AF_FORMAT_H