diff --git a/addlicensecomments.sh b/addlicensecomments.sh
new file mode 100644
index 0000000000000000000000000000000000000000..e5642e82d53ce7aa567a8e217d73e64a40644117
--- /dev/null
+++ b/addlicensecomments.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+for i in `grep -L 'This program is free software' src/*.{h,cpp}`
+do
+	cat licensecomment.txt > tempfile
+	cat $i >> tempfile
+	cp tempfile $i
+done
+rm tempfile
+
diff --git a/src/licensecomment.txt b/licensecomment.txt
similarity index 100%
rename from src/licensecomment.txt
rename to licensecomment.txt
diff --git a/src/client.cpp b/src/client.cpp
index 7652e047e8caa56d96de47c366cf1b833d5c6087..8a9c688ddcd57ec60ebfcc4c5a6d7916fb38780e 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "client.h"
 #include "utility.h"
 #include <iostream>
diff --git a/src/client.h b/src/client.h
index e7811d28f9e8ed1aa923d71e3bcd9af364276fc9..65b02a0e2245c0f8d979dff58745085032ff1492 100644
--- a/src/client.h
+++ b/src/client.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef CLIENT_HEADER
 #define CLIENT_HEADER
 
diff --git a/src/clientserver.h b/src/clientserver.h
index 2a80c34df3a48eb378cdf224c32c945f8325d2cd..ce595b6d4934924b7baf13e62b8eb380cde66ad2 100644
--- a/src/clientserver.h
+++ b/src/clientserver.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef CLIENTSERVER_HEADER
 #define CLIENTSERVER_HEADER
 
diff --git a/src/common_irrlicht.h b/src/common_irrlicht.h
index 69f00a7520ea2bc5f45459a5480f9f6e700a4fc1..9f28687d9b1d9a717c6b765cadcdfb8da4d92aa5 100644
--- a/src/common_irrlicht.h
+++ b/src/common_irrlicht.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef COMMON_IRRLICHT_HEADER
 #define COMMON_IRRLICHT_HEADER
 
diff --git a/src/connection.cpp b/src/connection.cpp
index 42bfdfb9f24e77621e5f50e5355f4eecb64e65b1..4e26c43e95766d0590725584d73ab491f14678a3 100644
--- a/src/connection.cpp
+++ b/src/connection.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "connection.h"
 #include "main.h"
 #include "serialization.h"
diff --git a/src/connection.h b/src/connection.h
index c67aa5feb6f1f8b1e095966c1f7e5d5c8592d8c1..82cf9d38e5d61a59d6e0070279c28b1d007526de 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef CONNECTION_HEADER
 #define CONNECTION_HEADER
 
diff --git a/src/constants.h b/src/constants.h
index d8435e36dee8f881d0876d6089b6f2df496fb3b3..84adfa79c37bfee4bdcd6af2cec92eed779882b8 100644
--- a/src/constants.h
+++ b/src/constants.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/environment.cpp b/src/environment.cpp
index 412bb33e8da21be44444b2a6e76fae375e82db68..c76721a77b9de864ee486388d061c3494ceade0a 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "environment.h"
 #include "main.h" // g_device for timing debug
 
diff --git a/src/environment.h b/src/environment.h
index 14151125883d30006a60ba7eba56ca9091d0c21f..ebc80ad1aaf0681c42f6d9091b9534dc9201641f 100644
--- a/src/environment.h
+++ b/src/environment.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef ENVIRONMENT_HEADER
 #define ENVIRONMENT_HEADER
 
diff --git a/src/exceptions.h b/src/exceptions.h
index 3e939a08616c75bc6fae507fcba94c8a7af1c155..80bdbeb361c7b15252dbd2d4716493606449a1a3 100644
--- a/src/exceptions.h
+++ b/src/exceptions.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef EXCEPTIONS_HEADER
 #define EXCEPTIONS_HEADER
 
diff --git a/src/filesys.cpp b/src/filesys.cpp
index 0012470497db524b0e4575fc8700a9ed4363900f..b62d3239ceee8f980cce9724b3b564bb7bbee5f1 100644
--- a/src/filesys.cpp
+++ b/src/filesys.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "filesys.h"
 #include <iostream>
 
diff --git a/src/filesys.h b/src/filesys.h
index 6222dbfdada0be0e45665deaf80130d0f0c49e46..6dbc426a5494454a075047300808e77071eb86b7 100644
--- a/src/filesys.h
+++ b/src/filesys.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef FILESYS_HEADER
 #define FILESYS_HEADER
 
diff --git a/src/heightmap.cpp b/src/heightmap.cpp
index a4027ee7d9f7f7beaf8f5a85905ab5113d29f6e1..5acb8916b0ce64fc776a123db42397ec7d601ec6 100644
--- a/src/heightmap.cpp
+++ b/src/heightmap.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/heightmap.h b/src/heightmap.h
index a5da092aa8569b21960aa3f7065d53ee904c0c6f..b7bb30aec7c3a4f09f52f62cbb1b645a7b46a48a 100644
--- a/src/heightmap.h
+++ b/src/heightmap.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/inventory.cpp b/src/inventory.cpp
index 4fe21b303bdf493c9fbb2362569cc1233e8a9ef5..ba8cf45801d6cf1e03da775572599b1cb397b1b3 100644
--- a/src/inventory.cpp
+++ b/src/inventory.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/inventory.h b/src/inventory.h
index 8ea8bd650c661b13d49f69267a15fcd63b77b94c..cc6393d435f75139e02d6db241a47eb7b7cf726f 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/light.cpp b/src/light.cpp
index 95bb37a8d55e58975f787e492c5b5a632b9dd8f8..5fd0ce54fdb2d79e3b6c853c8a158ad8fe68f969 100644
--- a/src/light.cpp
+++ b/src/light.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "light.h"
 
 /*
diff --git a/src/light.h b/src/light.h
index b76ac3a5d7166371b08d6ff280993eed296c58a6..8714269015f5e10d8b193b9d91fe45cefaef4b60 100644
--- a/src/light.h
+++ b/src/light.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef LIGHT_HEADER
 #define LIGHT_HEADER
 
diff --git a/src/loadstatus.h b/src/loadstatus.h
index a5fb6b3102895587a35bc1d3fda228d4eb435e5b..06d515ae3a2dd1aa70ce1e5876f56dd872b7d5ea 100644
--- a/src/loadstatus.h
+++ b/src/loadstatus.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef LOADSTATUS_HEADER
 #define LOADSTATUS_HEADER
 
diff --git a/src/map.cpp b/src/map.cpp
index 33501a32f23f23c99a563a462c477a2b8a947b79..900c1e98c9b320b6af5ae7286cac419c32e76f4c 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "map.h"
diff --git a/src/map.h b/src/map.h
index edfe5ef2a815c63f2a9ad6fd90fb1d14483d1626..7f791ffad8a2490c1c096437831c6c4e20df3be7 100644
--- a/src/map.h
+++ b/src/map.h
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #ifndef MAP_HEADER
diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index c4c4ad7959f4e0fbddc0d3388e8d4909461b9dbe..a4da657d1ede796156797e2eb315a52bb42ffc8a 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "mapblock.h"
diff --git a/src/mapblock.h b/src/mapblock.h
index 48f8775519fe8e47b713dba47e43beda4a6c9b2e..2c04343de31fd6ab98233a9dbca7bcffd613e9a8 100644
--- a/src/mapblock.h
+++ b/src/mapblock.h
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #ifndef MAPBLOCK_HEADER
diff --git a/src/mapblockobject.cpp b/src/mapblockobject.cpp
index df070265c7600441bf76b5e921ab086c3d10f708..1fda9baedffae570dcbb8b0ac2b0292c95670d9d 100644
--- a/src/mapblockobject.cpp
+++ b/src/mapblockobject.cpp
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "mapblockobject.h"
diff --git a/src/mapblockobject.h b/src/mapblockobject.h
index ea0293a6f6359cfc6a0d3082f4efe2e8f85fc7cb..2a5f9c933b46e581cedb0ce3dc3e318810965620 100644
--- a/src/mapblockobject.h
+++ b/src/mapblockobject.h
@@ -1,5 +1,20 @@
 /*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #ifndef MAPBLOCKOBJECT_HEADER
diff --git a/src/mapsector.cpp b/src/mapsector.cpp
index 8dd1c8c919ba821af7f55c9babe3e6e3d7baad70..f8367931496635002fa45264033e47cb2e3c67a6 100644
--- a/src/mapsector.cpp
+++ b/src/mapsector.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "mapsector.h"
 #include "jmutexautolock.h"
 #include "client.h"
diff --git a/src/mapsector.h b/src/mapsector.h
index de8cab536d1917ac2680b2527932fcd611346ffa..ad6161bdf88de9dc1be8787eead81cfeaae9ba91 100644
--- a/src/mapsector.h
+++ b/src/mapsector.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/player.cpp b/src/player.cpp
index 080de606738e00b1d60c96b2ef7b8c7941d82ee8..c3e14fc90bcde3cfe620ca2247fcce51930c555b 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/player.h b/src/player.h
index e692f55b104026b51b8c04631af52c3db5ae9d32..82ed92649d767baf763c754a0f7c7f8369d891a4 100644
--- a/src/player.h
+++ b/src/player.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/porting.h b/src/porting.h
index 3213ec9c0499edcbfef02c2ce5245878b8a9a52b..9f139d82512bed1581c5909660fbd9526dbce9b4 100644
--- a/src/porting.h
+++ b/src/porting.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/serialization.cpp b/src/serialization.cpp
index 72f675594e5aec0d44ca9aac5835838602950738..57db2b40f6c319133b99b2bb12964a909117ca00 100644
--- a/src/serialization.cpp
+++ b/src/serialization.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/serialization.h b/src/serialization.h
index b55625a4bb075630434ba83540945dca5041b97f..6e18497cf68492bf8dce40f4d2f12513de877eb0 100644
--- a/src/serialization.h
+++ b/src/serialization.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/server.cpp b/src/server.cpp
index 99683615ab454b5a04402a6e5596f44016ef4063..2d2e9e22d53d57e3a97488d67485cd0315048e15 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/server.h b/src/server.h
index 9c5850bff69bd1c19281d7743ef8aac810895fb8..a48f88805bb8b3b91d34391f176c6550e716900e 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/socket.cpp b/src/socket.cpp
index dddc8f36a30339abf7f5ca15bf669342f183661e..9ff30e10ff487678f4f270f45080f37d46ead77f 100644
--- a/src/socket.cpp
+++ b/src/socket.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "socket.h"
 #include "debug.h"
 #include <stdio.h>
diff --git a/src/socket.h b/src/socket.h
index 1cbed91cf3b120ab71413a8143ec0f3411a194bd..b6b58007392dc5a6b40347251d650cfa9070ee6b 100644
--- a/src/socket.h
+++ b/src/socket.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef SOCKET_HEADER
 #define SOCKET_HEADER
 
diff --git a/src/strfnd.h b/src/strfnd.h
index dbbec11a640180ecdffa24a583f0ebde5734401b..bbd0fa1e090357aa93f6246ea73ef9491d9980ff 100644
--- a/src/strfnd.h
+++ b/src/strfnd.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef STRFND_HEADER
 #define STRFND_HEADER
 
diff --git a/src/test.cpp b/src/test.cpp
index ce00306a634e93ab2162b59260f3247eccacb42b..005db2d24487eea08579f2fa2cefcac196ddbab3 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "test.h"
 #include "common_irrlicht.h"
 #include "debug.h"
diff --git a/src/test.h b/src/test.h
index 79560aea82ff66611802bea6fd135267ecf66a91..6c97d10cdf1f88ab0016fb0b1e4b1aaee85cb5bb 100644
--- a/src/test.h
+++ b/src/test.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef TEST_HEADER
 #define TEST_HEADER
 
diff --git a/src/utility.cpp b/src/utility.cpp
index f3b98f06296a73ac18cce0f323ed8dd248c4698c..5f3833e167397d75c4558b9b7158f4bc4e088d80 100644
--- a/src/utility.cpp
+++ b/src/utility.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/utility.h b/src/utility.h
index dabcce87cfd80f0f162dca388de21c4299b298d2..93fd9d4a7fe443ca38f04b57216356b6ddf95369 100644
--- a/src/utility.h
+++ b/src/utility.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 /*
 (c) 2010 Perttu Ahola <celeron55@gmail.com>
 */
diff --git a/src/voxel.cpp b/src/voxel.cpp
index 98c9817c5c9e9954ace62c841a429ac239871157..fc3b4c428681ffa31f422acf79052e486f2dc70a 100644
--- a/src/voxel.cpp
+++ b/src/voxel.cpp
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "voxel.h"
 #include "map.h"
 
diff --git a/src/voxel.h b/src/voxel.h
index eee9177f371cb7109ebce2b9a240606d31586c4c..2bc591d2a292bd9c8acbcb2f2f28ae8947a7c6f8 100644
--- a/src/voxel.h
+++ b/src/voxel.h
@@ -1,3 +1,22 @@
+/*
+Minetest-c55
+Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #ifndef VOXEL_HEADER
 #define VOXEL_HEADER