diff --git a/azbox/dmx.cpp b/azbox/dmx.cpp
index 7130597..fcd1e90 100644
--- a/azbox/dmx.cpp
+++ b/azbox/dmx.cpp
@@ -1,3 +1,24 @@
+/*
+ * cDemux implementation for azbox receivers (tested on azbox me and minime)
+ *
+ * derived from libtriple/dmx_td.cpp
+ *
+ * (C) 2010-2013 Stefan Seyfried
+ *
+ * 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.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "config.h"
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/generic-pc/dmx.cpp b/generic-pc/dmx.cpp
index 9d15091..1cc4359 100644
--- a/generic-pc/dmx.cpp
+++ b/generic-pc/dmx.cpp
@@ -1,3 +1,25 @@
+/*
+ * cDemux implementation for generic dvbapi
+ *
+ * derived from libtriple/dmx_td.cpp
+ *
+ * (C) 2010-2013 Stefan Seyfried
+ *
+ * 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.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
 #include "config.h"
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/libspark/dmx.cpp b/libspark/dmx.cpp
index 142b84a..50ef058 100644
--- a/libspark/dmx.cpp
+++ b/libspark/dmx.cpp
@@ -1,15 +1,23 @@
 /*
  * cDemux implementation for SH4 receivers (tested on fulan spark and
- * fulan spark7162 hardware
+ * fulan spark7162 hardware)
  *
  * derived from libtriple/dmx_td.cpp
  *
- * (C) 2010-2012 Stefan Seyfried
+ * (C) 2010-2013 Stefan Seyfried
  *
  * 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.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
  */
 
 /*
diff --git a/libtriple/dmx_td.cpp b/libtriple/dmx_td.cpp
index 073b2cd..f3549f6 100644
--- a/libtriple/dmx_td.cpp
+++ b/libtriple/dmx_td.cpp
@@ -1,3 +1,22 @@
+/*
+ * cDemux implementation for the Tripledragon dbs3000 receiver
+ *
+ * (C) 2010-2013 Stefan Seyfried
+ *
+ * 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.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>