нашел COPYING.LESSER с интересным дополнением
STATIC LINK EXCEPTION As a special exception, the Authors give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you must extend this exception to your version of the library. Note: this exception relieves you of any obligations under sections 4 and 5 of this license, and section 6 of the GNU General Public License.
Не делает ли это лицензию ничтожной? Есть ли у кого практика использования такой лицензии?