nbantext-*.jar and openide*.jar are compiled from SPL-licensed sources.
They are needed only at build time, not in the distributed NBM.
The header for the source files is:

-----------------------------%<-------------------------------------
                Sun Public License Notice

The contents of this file are subject to the Sun Public License
Version 1.0 (the "License"). You may not use this file except in
compliance with the License. A copy of the License is available at
http://www.sun.com/

The Original Code is NetBeans. The Initial Developer of the Original
Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
Microsystems, Inc. All Rights Reserved.
-----------------------------%<-------------------------------------

See www.netbeans.org for the full text of the SPL.