Update

PupilEXT/LICENSE

@@ -2,8 +2,9 @@
                        Version 3, 29 June 2007
 
  Copyright (C) 2021, Technical University of Darmstadt.
- Everyone is permitted to copy and distribute verbatim copies
+ Everyone is permitted to copy and distribute verbatim copie
  of this license document, but changing it is not allowed.
+ PupilEXT is for non-commercial use only.
 
                             Preamble
 
@@ -671,4 +672,4 @@ into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.