ADbNewsSender 2 uses the WYSIWYG editor TinyMCE (version 3.3.9).
TinyMCE was created by Moxiecode Systems AB. and is licensed under LGPL.
You can find the LGPL license text at /protected/admin/specialheaders/tinymce/lgpl.txt 
You can also get TinyMCE at http://tinymce.moxiecode.com