Longer version of GPL text

contrib/passport_guide.lua

@@ -1,3 +1,22 @@
+--[[
+  Passport cropping guide for darktable
+
+  copyright (c) 2017  Kåre Hampf
+  
+  darktable 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 3 of the License, or
+  (at your option) any later version.
+
+  darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
+]]
+
 --[[
 PASSPORT CROPPING GUIDE
 guides for cropping passport photos based on documents from the Finnish police
@@ -17,10 +36,6 @@ INSTALLATION
 USAGE
 * when using the cropping tool, select "passport" as guide and if you added the line in yout rc
   select "passport 36x47mm" as aspect
-
-LICENSE
-GPLv2
-
 ]]
 
 local dt = require "darktable"