Added language for US gov't contractors and users

to clarify that the GPLv3 license applies to them
as well as anyone else.

public-trunk/LEGAL

@@ -1,6 +1,7 @@
 OpenBTS
-Copyright 2008, 2009 Free Software Foundation.
-See COPYING for details.
+Copyright 2008-2010 Free Software Foundation, Inc.
+Copyright 2010 Kestrel Signal Processing, Inc.
+See COPYING for licensing details.
 
 
 Patent Laws
@@ -45,3 +46,32 @@ removed or replaced for non-GPL distributions:
 
 libosip2, liportp2, readline
 
+
+Note to US Government Users
+
+The OpenBTS software applications and associated documenttation are "Commercial
+Item(s)," as that term is defined at 48 C.F.R. Section 2.101, consisting of
+"Commercial Computer Software" and "Commercial Computer Software Documentation,"
+as such terms are used in 48 C.F.R. §12.212 or 48 C.F.R. §227.7202, as
+applicable. Consistent with 48 C.F.R. §12.212 or 48 C.F.R. Sections 227.7202-1
+through 227.7202-4, as applicable, the Commercial Computer Software and
+Commercial Computer Software Documentation are being licensed to U.S. Government
+end users (a) only as Commercial Items and (b) with only those rights as are
+granted to all other end users pursuant to the terms and conditions of GPLv3.
+
+
+Note to US Government Contractors
+
+GPL is not compatible with "government purpose rights" (GPR).  If you receive
+OpenBTS software under GPL and deliver it under GPR, you will be in violation
+of GPL and possibly subject to enforement actions by the original authors and
+copyright holders, including the Free Software Foundation, Inc.
+
+
+Other Licenses
+
+For information about acquring OpenBTS under non-GPL licenses, contact
+Kestrel Signal Processing, Inc., dburgess@kestrelsp.com.  Please be sure to
+put "OpenBTS" in the subject line.
+ 
+