> gnu's own definition of "free" doesn't mean anything else that it's an arbitrary
> definition, so it doesn't really mean it's free.

From 7-Zip.org:

In reply to:

---

LZMA SDK is released under the terms of the GNU LGPL

---

GNU Lesser General Public License
http://www.gnu.org/copyleft/lesser.html

Shortly, it is a license that permit also to close softwares to use the source code. More "free" than that.....