add static linking exception to LICENSE

Signed-off-by: Andy Green <andy.green@linaro.org>
diff --git a/LICENSE b/LICENSE
index 4362b49..7c89865 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,27 @@
+Libwebsockets and included programs are provided under the terms of the GNU
+Library General Public License (LGPL) 2.1, with the following exceptions:
+
+1) Static linking of programs with the libwebsockets library does not
+constitute a derivative work and does not require the author to provide 
+source code for the program, use the shared libwebsockets libraries, or
+link their program against a user-supplied version of libwebsockets.
+
+If you link the program to a modified version of libwebsockets, then the
+changes to libwebsockets must be provided under the terms of the LGPL in
+sections 1, 2, and 4.
+
+2) You do not have to provide a copy of the libwebsockets license with
+programs that are linked to the libwebsockets library, nor do you have to
+identify the libwebsockets license in your program or documentation as
+required by section 6 of the LGPL.
+
+However, programs must still identify their use of libwebsockets. The
+following example statement can be included in user documentation to
+satisfy this requirement:
+
+"[program] is based in part on the work of the libwebsockets  project
+(http://libwebsockets.org)"
+
                   GNU LESSER GENERAL PUBLIC LICENSE
                        Version 2.1, February 1999